JPH1079174A - Data receiving device suitable for preventing unauthorized copying of copyrighted works - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a data receiving device or the like that can easily perform processing for copyright protection on video data. SOLUTION: This data receiving apparatus receives digital data transmitted from a data transmitting apparatus via a transmission path and records the digital data on an external medium, and authenticates whether or not the data transmitting apparatus is an authorized data transmitting apparatus. A CGMS identification / update circuit 104 which determines whether or not recording of the digital data on a medium is permitted based on a use mode designation code in the received digital data, Authentication succeeds,
And a data recording circuit 101 for recording digital data on a medium when copying is permitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention A data transmitting apparatus for reading and outputting digital data from an information recording medium in which a literary work is recorded as digital data, receiving the digital data output from the data transmitting apparatus, reproducing a picture, and performing secondary recording. Data receiving device, and an information processing system and the like including the data transmitting device and the data receiving device,
In particular, the present invention relates to a data transmission device and the like suitable for copy protection of a copyrighted work.

[0002]

2. Description of the Related Art Conventionally, Compact Disc Read Onl has been used as an information recording medium for program data, audio information, and video information.
y Memory (CD-ROM) is known. CD-RO
M is a read-only optical disk having an information capacity of 540 MB, and is widely used as a distribution medium for program data, audio information, and video information. Also CD-ROM
There is a personal computer with a built-in CD-ROM drive as an information processing system for reading recorded information and performing information processing.

In recent years, with the enhancement of the processing environment for audio information and video information on personal computers, CD-ROM
It has become possible to directly output audio information and video information stored in a personal computer on a personal computer. However, since the amount of video information is much larger than that of program data, it is necessary to digitally compress the video information before storing it on a CD-ROM.

As a compression method of video information supporting a transfer rate of 1.2 Mbps, MPEG (Moving Picture Exposure) is used.
erts Group). In the MPEG1 system, video information is compressed mainly by inter-frame compression. Video information is 1
Although it is a moving image composed of still images called several tens of frames per second, in inter-frame compression, sufficient data is prepared to reproduce the still image only one frame every few frames. For the other frames, the necessary data amount is compressed by preparing only data of the difference from the frame in which data sufficient for reproduction is prepared.

[0005] Actually, in the MPEG1 system, not only video information but also audio information is mixed and compressed, and compressed into digital data called an MPEG system stream. For this reason, it is difficult to generally distinguish digital data from video information and audio information, and such video information and audio information,
Furthermore, information in which information necessary for reproducing the information is mixed is stored in an AV data structure (Audio and Video data structure).
data) or AV data (Audio an
d Video data). In the present specification, at least information in which video information and audio information are mixed is referred to as “AV data”. Note that digital data that is non-AV data is referred to as “non-AV data”.

[0006] The above-mentioned MPEG1 video has a horizontal resolution of about 250 lines, which is not sufficient for applications requiring high quality video such as movie applications. For this reason, a storage medium for an application that requires high-quality video has a horizontal resolution of 43.
0 lasers that store video information in an analog fashion
Disc (LD) has been used so far. However, since analog data is not suitable for processing on a computer, digital versatile optical discs have recently been used as new optical discs that can be handled on a computer and have a resolution that can be realized for movie applications.
Disk (DVD) has begun to be supplied. DVD is CD-R
It has a storage capacity of digital data more than 8 times of OM, and C
A data transfer rate five times or more that of a D-ROM can be realized. Accordingly, DVD is an MPEG which realizes a horizontal resolution of 450 lines or more as a data compression method of video information.
By adopting two methods, a high-quality moving image compatible with movie applications is realized.

Hereinafter, the above-described AV will be described with reference to the drawings.
A personal computer with a CD-ROM drive, which is an information processing system for directly reproducing data on a personal computer, will be described. FIG. 36 shows a conventional CD.
FIG. 2 is a diagram illustrating a configuration of a personal computer with a ROM drive.

A CD-ROM 2401 is an information recording medium on which digital data is recorded.
The PEG stream is managed and recorded by the file system. The CD-ROM drive 2402 is a CD-R
The digital data of the designated sector number on the OM 2401 is read and output to the outside.

The AV signal processing unit 2403 receives the input M
After performing a predetermined decompression process on the PEG stream,
Convert to analog audio signal and video data and output to external.
The output analog audio signal is output to the accompanying speaker 24.
Sound is output from 03S. The HD device 2404 is a hard disk device. The input unit 2405 is a mouse 24
This port receives an instruction command input from a user via the keyboard 05M or the keyboard 2405K.

[0010] An I / O bus 2406 is an internal bus of the computer that connects each component. The video signal processing unit 2407 combines the video data output from the AV signal processing unit 2403 with the video data for display generated inside the personal computer, converts the video data into an analog video signal, and attaches it to the display device 2407D.
Output to The video signal processing unit 2407 is typically called a video card.

A control unit 2408 controls the entire operation of the present computer.
CPU 2408C, Bus Interface
(I / F) 2408I and main memory 2408M. The main storage 2408M of the control unit 2408 has an Operating System (O) for managing a file system.
S) As an application under the OS, a control program for reproducing or copying data recorded on the CD-ROM 2401 in accordance with a user instruction is loaded. The display unit 2407D includes a control unit 2
A graphic user interface generated by the control program loaded in 408 is displayed.

FIG. 37 is a front view of the display device 2407D. 2301 is a display device 2407D
, A display area 2302, an MPE 2303.
G moving image display area, 2304 is a control panel display area, 2305 is a keyboard 2 attached to the input unit 2405
405K and graphics for feeding back the position coordinates designated by the mouse 2405M on the screen.

The operation of the personal computer with a CD-ROM drive configured as described above will be described below. Since the entire operation is the same as that of a general-purpose personal computer (for example, a PC / AT computer compatible with IBM), a detailed description of the entirety is omitted here, and the CD-ROM 2401 related to the present invention is omitted. Operation of reproducing the above AV data and the CD-ROM 240
Only the operation of copying the file on the first device to the HD device 2404 will be described.

Here, "reproduce" refers to restoring AV data into video and audio that can be viewed by humans.
“Copy” refers to reading information from a certain medium and recording the information as it is on another medium. First, an operation of reproducing AV data will be described. If the user specifies a key “PLAY” displayed in the control panel display area 2304 with a mouse 2405M attached to the input unit 2405, the control unit 2408 interprets the input coordinates as a reproduction control command of “start reproduction”,
The recording address on the CD-ROM 2401 of the file storing the predetermined reproduction start MPEG stream is calculated according to the file system. The control unit 2408 issues a data read command (READ #Addr) of the calculated recording address.
ess) to the CD-ROM drive 2402, and outputs the read digital data to the AV signal processing unit 2403 by a data write command (WRITE). AV signal processing unit 2
Reference numeral 403 subjects the input digital data, which is an MPEG stream, to predetermined decompression processing, converts the digital data into analog audio signals and video data, and outputs the analog audio signals and video data. The analog audio signal is output as audio through an associated speaker, and the video data is input to a video signal processing unit 2407, where it is synthesized with image information for display of a computer, and the associated display device 24
Video is output at 07D. Thus, the CD-RO
The MPEG stream read from M2401 is stored in the MPEG moving image display area 230 of the display device 2407D.
3 will be displayed.

Next, an operation of copying a file recorded on the CD-ROM 2401 to the HD device 2404 will be described. The input unit 2405 includes a keyboard 2405
K receives a command input by the user. The input command sets the file in the CD-ROM 2401 to H
If the command is a copy command for copying to the D device 2404, the control unit 2408 causes the CD-ROM 24
01 is calculated according to the file system. When the recording address is calculated, the control unit 2408 instructs the CD-ROM drive 2402 to read the data read command (RE
By issuing an AD #Address, the digital data at the calculated recording address is read, and subsequently, by issuing a data write command (WRITE) to the HD device 2404, the digital data is output to the HD device 2404 for recording.

As described above, in the conventional information processing system, the AV data stored in the information recording medium is reproduced or copied according to a user's instruction.

[0017]

However, in such a conventional information processing system, the CD-ROM 240
The digital data read from 1 is processed in the same manner by the control unit 2408 without distinction between the case where it is AV data and the case where it is non-AV data. For this reason, there is a problem in that it is difficult to perform copyright protection processing on AV data.

Here, the "copyright processing" refers to
This is a process for ensuring that data is used in the information processing system only in a usage mode designated by the copyright holder. Specifically, the “usage form” includes a case where only reproduction of AV data is permitted (that is, copying to an HD device or the like is prohibited), a case where not only reproduction but also copying of AV data is permitted. .

However, in the configuration according to the above-mentioned prior art, the HD device 240 stores a file storing AV data for which the copyright holder does not permit copying due to a user's erroneous operation or the like.
Even when a copy command is issued to the CD-ROM 4, a read command (READ #Address) is input to the CD-ROM drive 2402 as in the case of the reproduction command. The AV data is output and copied to the HD device 2404.

As another problem, the operation of the control unit 2408 is dynamically determined by the loaded OS and the reproduction control program. However, if a program having an incorrect content is loaded, the user's intention is determined. Irrespective of this, a malfunction may occur in which a file storing AV data for which copying is not permitted is copied. Due to the above-mentioned problem, even if the copyright holder of the AV data does not permit copying, the AV data may be secondarily recorded on an HD device or the like, and the copyright of the copyright holder of the AV data is protected. Not done. This problem is particularly noticeable in applications that use high-quality video with many horizontal resolutions. As a countermeasure, the copyright owner sets application prices in anticipation of loss due to copyright infringement, For extremely expensive movie applications, it may happen that production is abandoned. As a result, a healthy market in which many applications are provided to users at appropriate prices cannot be expected, and the disadvantage for users is extremely large.

Therefore, the present invention has been made in view of the above problems, and a data receiving apparatus, a data transmitting apparatus,
Providing an information processing system, a data receiving method, and an information recording medium on which the method is recorded, that is, ensuring that AV data recorded on the information recording medium is processed only in a use mode specified by a copyright holder. It is an object of the present invention to provide a data receiving device or the like capable of performing such operations.

[0022]

In order to achieve the above object, a data receiving apparatus or the like according to the present invention includes a digital data transmitted from a data transmitting apparatus via a transmission line (this digital data includes Data and a usage pattern designating code for designating a usage pattern of the video data), and recording the data on an external medium, wherein the data transmission device is a legitimate data transmission device. An authentication unit that attempts to authenticate whether or not there is, a receiving unit that receives the digital data, and determines whether recording of the digital data on the medium is permitted based on a use mode designation code in the received digital data. The copy permission / rejection determination means and the authentication means determine that the authentication has succeeded and the copy permission / rejection means has determined that the authentication has been permitted. Characterized in that it comprises a recording means for recording Rudeta on the medium.

[0023] With this configuration, it is possible to prevent the illegal operation that the video data is illegally copied to the data receiving device such as the recording device outside the range of the use form designated by the copyright holder.

[0024]

Embodiments of an information processing system according to the present invention will be described below with reference to the drawings. (First Embodiment) An information processing system according to a first embodiment
It reads digital data recorded on a DVD and processes (reproduces and copies) the data within a use form designated by the copyright holder, and is characterized by having an internal bus and an external bus. (Configuration of Information Processing System) FIG. 1 is a diagram showing an appearance of an information processing system according to the first embodiment, and FIG. 2 is a functional block diagram showing a configuration of the information processing system according to the first embodiment.

The information processing system is roughly divided into an information processing apparatus 40 and a Small Computer System
rface (SCSI) SCS connected via bus 43
And an I device group 50. The information processing device 40 further includes a control unit 49, an input unit 45, a keyboard 45K, a mouse 45M, an I / O bus 42, an AV signal processing unit 47, a video signal processing unit 48, a display device 48D, and a speaker 47S. The SCSI device group 50 includes:
Furthermore, the HD device 44, DVD-Read Only Memory (RO
M) 41, DVD-ROM drive 46, DVD-Rand
An om Access Memory (RAM) 99 and a DVD-RAM drive 910 are provided.

The control unit 49 controls all of the above-mentioned components constituting the information processing system, and mainly acquires instructions from the user and performs DVD operations according to the instructions.
-Control for reproducing or copying digital data recorded in the ROM 41. This control unit 49
Are components 47, 48 connected to the I / O bus 42,
45 is directly controlled via the I / O bus 42,
Components 44, 46, 91 connected to CSI bus 43
0 is indirectly controlled via the AV signal processing unit 47.

The input unit 45 is an interface for receiving an instruction command from a user.
5M and a keyboard 45K are connected. The I / O bus 42 is an internal bus of the information processing device 40 and connects the control unit 49, the input unit 45, the AV signal processing unit 47, and the video signal processing unit 48. As the I / O bus 42, for example, a PCI bus or an ISA bus can be used.

The AV signal processing unit 47 includes a control unit 49 and an SC
A function as a SCSI interface for relaying with the SI device, and A
V data is reproduced, that is, AV data is decompressed and converted into video data and audio data by the video signal processing unit 4 respectively.
8 and a function as a regular data receiving device for outputting to the speaker 47S. Here, "data receiving device"
The term “device” refers to a device that receives digital data via a transmission path and performs certain processing. Also, "authorized data receiving device"
Means a data receiving device that processes AV data properly, that is, a data receiving device that processes digital data within the range of usage specified by the copyright holder. Specifically, for example, in the case where AV data for which copying is prohibited and reproduction only is permitted is received, only the reproduction is performed, and the normal data receiving device does not secondary record the data. Refers to a data receiving device.

The video signal processing section 48 combines the video data output from the AV signal processing section 47 with the graphics data generated according to the instruction from the control section 49, converts the synthesized video data into an analog video signal, and outputs the analog video signal to the display device 48D. Output. The HD device 44 is a secondary storage device for non-AV data, and is used as a copy destination of program data recorded on the DVD-ROM 41 in the present embodiment.

The DVD-ROM 41 has a read-only D
VD, which is an information recording medium in which digital data to be processed by the information processing system is recorded in advance.
The DVD-ROM drive 46 is one of legitimate data transmission devices, reads digital data recorded on the DVD-ROM 41, and outputs the digital data to the data reception device via the SCSI bus 43. Here, the "data transmitting device" means a device that extracts digital data from a medium and outputs the data to a data receiving device via a transmission path, and the "regular data transmitting device" normally processes AV data. A data transmission device, that is, a data transmission device that outputs AV data only when the transmission destination is a legitimate data reception device.

The DVD-RAM 99 has a rewritable D
VD, which is used as an information recording medium for secondary storage of AV data recorded on the DVD-ROM 41 in this embodiment. The DVD-RAM drive 910 is one of legitimate data receiving devices, and records digital data received via the SCSI bus 43 on the DVD-RAM 99.

The SCSI bus 43 is an external bus compliant with the SCSI standard for connecting the information processing device 40 and the SCSI device group 50. In this information processing system, SC
In order to determine whether the SI device is a legitimate data transmitting device or a legitimate data receiving device, a device type code uniquely defined in the range of the SCSI standard is used. Hereinafter, the SCSI standard related to this device type code will be described.

In the SCSI standard, the SC connected to the bus
The SI device has an ID code as an identification code on the bus. As a preprocessing, the SCSI device that transmits data and commands outputs a bus occupation request including its own ID code and the ID code of the transmission destination to the bus, and the transmission destination SCSI device responds to this request to occupy the bus. Then, data and commands are transmitted. That is, the SCSI device connected to the SCSI bus is
The D code makes it possible to identify each other during data transmission.

Further, the SCSI device connected to the SCSI bus has device attribute information indicating the type and function of the SCSI device. FIGS. 3A and 3B are diagrams for explaining device attribute information. FIG. 3A shows the entire format of the data attribute information. In the figure, the first one byte stores the peripheral device classification code in the upper three bits and the device type code in the lower four bits.

FIG. 3B shows the correspondence between the device type code and the device type indicated by the device type code. As shown in the figure, the device type code is (10101)
If the device type code is (10111), "AV disk read-only device" and the device type code is (1011).
010) indicates “AV signal processing device”.

In this embodiment, the device type is "AV disk read-only device (1010
1)), “AV disc recording device (1011)
1) "and" AV signal processing device (10010) "
The SCSI device that is one of the above is generically referred to as “AV device” in this specification. In this embodiment, D
The VD-ROM drive 46 is an “AV disk read-only device (10101)”, and the AV signal processing unit 4
7 is an “AV signal processing device (10010)”,
The DVD-RAM drive 910 is an "AV disk recording device (10111)",
Device.

When a SCSI command (INQUIRY) for authentication is input, the SCSI device connected to the SCSI bus returns this device attribute information via the SCSI bus. SCSI that received device attribute information
The device internally holds device attribute information in association with the transmission source device ID. Therefore, the SCSI device that has once obtained the device attribute information by the SCSI command (INQUIRY) for authentication can grasp the device type of another SCSI device that has obtained the device attribute information.

In this specification, the AV device is an authentication S
The operation of using the CSI command (INQUIRY) to confirm that the data transfer source and the data transfer destination are AV devices is called "AV device mutual authentication". Next, D
VD-ROM41, DVD-RAM99, DVD-RO
M drive 46, DVD-RAM drive 910, AV
The signal processing unit 47 and the control unit 49 will be described in more detail. [DVD-ROM41 and DVD-RAM99] DVD
-The structure of the ROM 41 and the DVD-RAM 99 (both are simply referred to as "DVD") and the structure of digital data recorded on them are as follows.

<Structure of DVD> FIG. 4A is a front view of the DVD. The DVD 2200 has a center hole 2201. Around the center hole, a clamp area 2 of the disk is provided.
An information recording area 2203 for storing digital data is provided from outside the clamp area.

The information recording area is a lead-in area from the inner circumference.
(lead-in) area 2205, data area record (data-record
ed) 2206, lead-out area 2207
Broadly divided into areas. The lead-in area 2205 contains a DVD drive (DVD-ROM drive 4) at the start of reading.
6 and the DVD-RAM drive 910 together,
Data for initialization is stored in the data recording area 2206, and digital data different for each application is stored in the data recording area 2206. The lead-out area 2207 is an area for notifying the end of the data recording area 2206 to the DVD drive, and does not store significant digital data. That is, in reading by the DVD drive, the lead-in area 2205 is first read when the disc is mounted, and thereafter, the data recording area 2206 is read in accordance with an instruction input from the outside.

FIG. 4B is a sectional view of the DVD. DV
The information recording area of D2200 includes a first transparent substrate 2208 having a thickness of about 0.6 mm (0.5 mm or more and 0.7 mm or less) from the lower side of the drawing, an information layer 2209 thereon, and an information layer 2209 having a thickness of about 0.6 mm. Second transparent substrate 2211, information layer 2209
An adhesive layer 2210 is provided between the first transparent substrate 2211 and the second transparent substrate 2211 to bond the two, and a printing layer 2212 for label printing is provided on the second transparent substrate 2211 as needed. The printing layer 2212 may be provided partially.

The lower reading surface on which the light beam 2213 is incident and information is read is referred to as the front surface A, and the upper surface on which the printed layer 2212 is formed is referred to as the back surface B. In the case of the DVD-ROM 41, a reflective film such as a metal thin film is attached to the information layer 2209, and uneven pits are formed on the surface in contact with the first transparent substrate 2208. The content of the digital data is determined by the length and interval of the pit. The length and interval of the pits are shorter than in the case of a CD, and the pitch of the information tracks formed by the pit rows is configured to be narrow.
Reading of information is performed by irradiating a pit with a light beam 2213 and reading a change in the reflectance.

On the other hand, in the case of the DVD-RAM 99, the information layer 2209 is made of a special recording material (a kind of alloy), and information is recorded by its phase change. That is, the information layer 2209 is heated by high-temperature heating using a high-output light beam.
The information is recorded by utilizing the fact that the light spot 2214 changes from a crystalline state to an amorphous state.
The reading of information is performed by reading the change in the reflectance between the amorphous phase and the crystalline phase using a low-output light beam.

The light spot 2214 of the DVD has a large numerical aperture NA of the objective lens and a small wavelength λ of the light beam.
It is 6. The recording capacity of a DVD having such a physical structure is about 4.7 Gbytes in the DVD-ROM 41,
In the DVD-RAM 99, it is about 2.6 GB. Note that the storage capacity of the DVD-ROM 41 of about 4.7 Gbytes is about eight times as large as that of the conventional CD-ROM. Therefore, the quality of moving images that can be recorded on a DVD-ROM can be greatly improved, and the reproduction time can be improved to two hours or more. Due to such a recording capacity, the DVD is very suitable for a high-quality video recording medium. <Physical Format of DVD> FIGS. 5A to 5F
FIG. 1 is a diagram showing a physical structure of recording data called a physical format of a DVD.

FIG. 5A shows the data recording area 22 of the DVD.
FIG. 6 is a diagram showing a physical structure of the optical disc 06. The DVD data recording area 2206 is divided into a plurality of sectors. A sector is the minimum unit when writing or reading data. FIG. 5B is a structural diagram showing the structure of one sector. Each sector has a configuration in which a 12-byte sector header area, a 2048-byte user data area, and a 4-byte error detection code area are arranged from the top.

The user data area stores digital data having file management information or application information including AV data as contents. An MPEG stream is stored as the AV data included in the application information. Further, as the file management information, management information on a file system that manages a plurality of sectors as files and a plurality of files grouped and managed as a directory is stored.

In the sector header area, in order from the top, a sector address, which is address information for identifying a sector, an error correction code of the sector address, a copy generation
Management System (CGMS) control data is stored. The CGMS control data is information for specifying a use form of digital data stored in the sector. DVD
When reading one sector, the drive reads the CG
The read control is performed according to the MS control data.

The address information of the sector includes information for identifying each of the above-described lead-in area 2205, data recording area 2206, and lead-out area 2207. Area can be determined. FIG. 5C is a diagram showing a structure of CGMS control data composed of 6 bytes. The CGMS control data includes a 1-byte data attribute code, 1-byte CGMS data, and 4-byte reservation.

FIG. 5D is a diagram for explaining the meaning of the data attribute code. Data attribute code is "01h"
(“H” indicates a hexadecimal number) indicates that AV data is recorded in the user data area of this sector. “00h” indicates that the data attribute has not been specified. FIG.
(E) is a diagram showing the structure of CGMS data. CG
Although the size of the MS data is 1 byte, the upper two bits thereof are called a CGMS code and store information for specifying a use form of digital data stored in a user data area of this sector.

FIG. 5F is a diagram for explaining the meaning of the CGMS code. When the CGMS code is “00”, it means copy permission, when it is “10”, copy permission is limited to one generation, and when it is “11”, copy permission is prohibited. Note that "copy of one generation" means, for example, A
This means that V data can be copied to the DVD-RAM 99 but AV data copied to the DVD-RAM 99 cannot be further copied to another DVD-RAM. Further, in the present embodiment, it means that reproduction is permitted for any code.

With the above-described sector structure, the DVD drive refers to the CGMS control data of the sector when reading digital data from the user data area of the DVD sector, and determines whether the digital data is AV data. No, and what kind of content is set as to whether copying is permitted or not. <Logical format of DVD> FIGS. 6A and 6B
FIG. 2 is a diagram showing a logical structure of recording data called a logical format of a DVD.

FIG. 6A shows the data recording area 22 of the DVD.
FIG. 12 is a diagram showing a logical structure of the logical device 06. Data recording area 2
206, file management information is recorded at the head, and a plurality of files are recorded after the file management information. "File"
This is a logical data unit for grouping and managing data of a plurality of sectors. Information indicating the attribute of each file is stored in file management information. The file management information may further include information for managing a group of a plurality of files in a unit called a directory.

FIG. 6B is a tree diagram showing the file / directory structure in this embodiment. An ellipse indicates a directory and a rectangle indicates a file. In this example, R
The DVD_VIDEO directory and the File1. DAT and File2. DAT
There are two files. The DVD directory further contains Movie1. VOB, Movie2. V
OB, and Movie3. There are a total of three VOB files.

In this embodiment, rules are defined for file names and directory names so that the types of files can be easily identified. An AV data file is obtained by adding a VOB to the extension of the file name. Also,
A directory having a name of DVD_VIDEO is a specific directory for storing AV data, and files stored in this directory are files for uniformly storing AV data. In the tree diagram of FIG.
ie1. VOB, Movie2. VOB and Movi
e3. A file in which VOB stores AV data
A file that stores such AV data is called an “AV data file”. ). On the other hand, File1. D
AT and File2. The DAT is a file storing non-AV data (hereinafter, such a file storing non-AV data is referred to as a “non-AV data file”).

By interpreting the name of the file or directory designated to be read according to such a naming convention, whether reading of the AV data file has been attempted is determined.
Alternatively, it is possible to determine whether reading of a non-AV data file has been attempted. For example, if a directory named DVD_VIDEO is included in the path of the file for which reading was attempted, it can be determined that the reading is an AV data file. Note that the file management information according to the present embodiment complies with the ISO13346 standard.

FIGS. 7A to 7C are views for explaining the ISO13346 standard used as the file system of the logical format shown in FIGS. 6A and 6B. is there. A procedure related to the present invention, that is, a procedure for acquiring a file recording address from a file name will be described with reference to these drawings. FIG.
FIG. 4 is a diagram illustrating a logical relationship between data in file management information according to the SO13346 standard.

According to the ISO13346 standard, in addition to a read-only disc, a rewritable disc is supported, and therefore, the recording position of a file is determined by a file entry (File E).
ntry) is stored and managed. For example,
Movie1. In the VOB, a file entry for Movie1 exists in the file management information. D
The AT has a file entry for File1 in the file management information. Therefore, in order to obtain the recording address of a file, it is necessary to obtain a target file entry. These file entries can be obtained by tracing directories that form a hierarchical structure of files. The directory information exists in the file management information as a directory file.
A directory file contains multiple file identification descriptors (Fi
le Identify Descriptor), and each file identification descriptor includes a recording address and a file name of a file managed by the directory or a file entry of the directory. The root file entry, which is the top of the directory hierarchy, is a file group descriptor (File) stored at a predetermined position in the file management information.
Set Descrddiptor). For this reason, it becomes possible to obtain the target file entry by tracing the directory hierarchy by the file name starting from the root, and to obtain the address information from the file entry.

FIG. 7B is a diagram showing the structure of a file identification descriptor for a directory. As shown in the figure, the above-mentioned naming convention is defined for the directory name of the file identification descriptor. FIG. 7 (c)
FIG. 4 is a diagram showing the structure of a file identification descriptor for a file. As shown in the figure, the naming convention described above is also defined for the file name of this file identification descriptor. [DVD-ROM drive 46] FIG.
FIG. 3 is a block diagram showing a detailed configuration of an M drive 46.

The DVD-ROM drive 46 further includes an interface connector 500, a data read circuit 50
1, CGMS control data memory 502, user data memory 503, CGMS data identification circuit 504, SC
SI bus control circuit 505, user data replacement circuit 50
6, an internal data bus 507, a control bus 508, and a microprocessor 509.

The interface connector 500 is an SCS
A connector for connecting the I bus 43 and the DVD-ROM drive 46. Upon receiving the designation of the sector number as the address information, the data read circuit 501 reads the digital data stored in the specified sector from the DVD-ROM 41 by controlling the associated disk drive, and reads the digital data stored in the user data area of the sector. The data is stored in the user data memory 503 in the CGM of the sector header area of the sector.
The S control data is stored in the CGMS control data memory 502.

The CGMS control data memory 502 is a memory for temporarily storing CGMS control data of sector data. The user data memory 503 is a memory for temporarily storing user data of sector data.
The CGMS data identification circuit 504 is a circuit for identifying the contents of the CGMS control data. Specifically, the CGMS data identification circuit 504 reads the CGMS control data stored in the CGMS control data memory 502 and changes the data attribute code in the CGMS control data. The user data memory 50 can be referred to.
It determines whether the data attribute of the user data stored in No. 3 is “unspecified” or “AV data”, and notifies the microprocessor 509 of the result. Also,
By referring to the CGMS data in the CGMS control data, the copy restriction information of the user data stored in the user data memory 503 becomes “copy permitted”.
Judgment is made between "one generation copy permitted" and "copy not permitted", and the result is determined by the microprocessor 509.
Notify.

The SCSI bus control circuit 505 has a SCSI
Bus controller, interface connector 5
00 is connected to the SCSI bus 43
It transmits and receives commands and data according to the SI standard.
The user data replacement circuit 506 is one of circuits for protecting copyright, reads user data stored in the user data memory 503 and converts it into NULL data in accordance with an instruction from the microprocessor 509. I do. Here, “NULL data” is, for example, “0
000h "means dummy data having no information.

The internal data bus 507 is a transmission path for data read by the data read circuit 501 or data to be output to the SCSI bus 43 by the SCSI bus control circuit 505. The control bus 508 is a transmission path for instruction information (that is, a set of commands) output from the microprocessor 509 and processing result information sent from each circuit.

The microprocessor 509 interprets the SCSI command received by the SCSI bus control circuit 505 according to the built-in control program, and
The control of the entire drive 46 is performed. Hereinafter, an authentication SCSI command (INQUIRY) for performing mutual authentication and a device type of a device of a data transmission / reception destination, and a SCSI command (REA) for reading digital data in general on a DVD.
D) The microprocessor 50 when a SCSI command (READ_AV), which is a dedicated command for exclusively reading AV data among digital data, is input.
9 will be described.

<SCSI Command for Authentication (INQUIRY)>
When the microprocessor 509 determines that the input SCSI command is the authentication SCSI command (INQUIRY), the microprocessor 509 transmits the DV command via the SCSI bus control circuit 505.
FIG. 3 shows the device attribute data of the D-ROM drive 46 itself.
The authentication SCSI command (INQUIRY) is returned to the target device that has issued the authentication SCSI command (INQUIRY) in the format shown in FIG.
Note that the device type,
The code is “1010” as shown in FIG.
1 "(AV disk playback-only device).

<SCSI command for data reading (RE
AD)> The microprocessor 509 receives the input SCS
The I command is a SCSI command for reading data (REA
D), the DVD-ROM 41 according to the sector number attached as a command parameter.
The data read circuit 501 is started so as to read digital data recorded in the. Data read circuit 501
Is separated into CGMS control data stored in a header area of a sector and user data stored in a user data area of the sector, and a CGMS control data memory 502, respectively.
It is stored in the user data memory 503.

Thereafter, the CGMS data identification circuit 504
Determines whether the user data (2048 bytes) stored in the user data memory 503 is AV data. As a result, if the user data is AV data, the user data replacement circuit 50
6 sets the user data (2048 bytes) to NULL
Replace with data (2048 bytes). After that, SCS
The I bus control circuit 505 transfers the replaced user data to the SCSI device that has issued this command.

On the other hand, if the user data is non-AV data, the user data is transferred to the SCSI device that has issued this command without performing the above replacement. <SCSI command for reading AV data (READ_AV)
> The microprocessor 509 determines that the input SCSI command is an AV data read SCSI command (READ
_AV), the DVD-ROM is similarly assigned according to the sector number attached as a command parameter.
The data read circuit 501 is started to read digital data recorded in the ROM 41. The digital data read by the data read circuit 501 is separated into CGMS control data stored in the header area of the sector and user data stored in the user data area of the sector.
2 and the user data memory 503.

After that, the microprocessor 509 sets C
The GMS data identification circuit 504 determines whether the user data (2048 bytes) stored in the user data memory 503 is AV data, and further determines whether the copy restriction information of the user data is “copy permitted”, “one generation copy permitted”, It is determined which of “copy not permitted”.

Subsequently, the microprocessor 509 sends the device attribute data of the data transfer destination SCSI device (this is the SCSI command for reading AV data (READ_A
V), the user data is transferred to an AV device, and if the transfer destination is an AV device, the user data is used for reproduction. Or whether it will be used for copying. Specifically, the device type code of the SCSI device of the data transfer destination is “10101”, “1011”.
In the case of either “1” or “10010”, it is determined that the device is an AV device. If “10010”, it is determined that the device is used for reproduction.

As a result of the above judgment, in any of the following cases, the microprocessor 509 stores the CGMS control data (6 bytes per sector) stored in the CGMS control data memory 502 and the CGMS control data in the user data memory 503. A total of 2054 bytes of digital data of the user data (2048 bytes per sector) is output to the SCSI device that sent this command, with the data transfer unit being 2054 bytes. (1) When the user data (2048 bytes) is non-AV data. (2) When the user data (2048 bytes) is AV data and the AV data is used for reproduction. (3) When the user data (2048 bytes) is AV data, the AV data is used for copying, and the copy restriction information is “copy permitted” or “one generation copy permitted”.

On the other hand, in any of the following cases, the microprocessor 509 uses the user data replacement circuit 50 to store the user data (2048 bytes per sector) stored in the user data memory 503 as copyright protection processing.
6 after replacing with NULL data (2048 bytes), and adding the CGMS control data (6 bytes) stored in the CGMS control data memory 502 to a total of 2
054 bytes of digital data, the data transfer unit is set to 2054 bytes, and the SC
Output to SI device. (1) When the user data is AV data and the transfer destination of the user data is a non-AV device. (2) The user data is AV data and its A
When the V data is used for copying and the copy restriction information is “copy prohibited”. [DVD-RAM Drive 910] FIG.
FIG. 3 is a block diagram showing a detailed configuration of an AM drive 910.

The DVD-RAM drive 910 further includes
Interface connector 100, data recording circuit 10
1. CGMS control data memory 102, user data memory 103, CGMS data identification / update circuit 10
4. SCSI bus control circuit 105, user data replacement circuit 106, internal data bus 107, control bus 108,
It comprises a microprocessor 109.

In the above-described configuration, the interface connector 100, the CGMS control data memory 102, the user data memory 103, the SCSI bus control circuit 10
5, user data replacement circuit 106, internal data bus 10
7. The control bus 108 is the same as the corresponding configuration of the DVD-ROM drive 46, and duplicate description is omitted. The microprocessor 109 having a different function, the CGMS data identification / update circuit 104 which is a new configuration, the data recording Only the circuit 101 will be described.

The correspondence between the components whose description has been omitted and the components in the first embodiment is shown in the following table.
00 and interface connector 500, CGMS control data memory 102 and CGMS control data memory 50
2. User data memory 103 and user data memory 503; SCSI bus control circuit 105 and SCSI bus control circuit 505; user data replacement circuit 106 and user data replacement circuit 506; internal data bus 107 and internal data bus 507.

The data recording circuit 101 writes the data stored in the user data memory 103 or the CGMS control data memory 102 to the DVD-RAM 99 in accordance with an instruction from the microprocessor 109. On this occasion,
CGMS control data and user data are shown in FIG.
The data is recorded in the sector header area and the user data area of the specified sector in the format shown in FIGS.

The CGMS data identification / update circuit 104
This is a circuit for identifying and updating the contents of the CGMS control data. Specifically, in accordance with an instruction from the microprocessor 109, the CGMS control data memory 102
The CGMS control data is read from the CPU, the data attribute code and the CGMS code are identified therein, and the result is reported to the microprocessor 109. Also, according to an instruction from the microprocessor 109, the CG in the CGMS control data stored in the CGMS control data memory 102
The MS data is updated. In this update processing, the CGMS code indicates that “1 generation copy permitted (d7, d6 = 1,
0) "," copy prohibited (d7, d6 = 1, 1) "
Update to This is to prohibit the second generation copy.

The microprocessor 109 interprets the SCSI command received by the SCSI bus control circuit 105 according to the built-in control program, and
The entire drive 910 is controlled. Hereinafter, the DVD-RA when the SCSI command for AV data recording (WRITE_AV) and the SCSI command for authentication (INQUIRY) are input.
The operation of the M drive 910 will be described.

<SCSI Command for Authentication (INQUIRY)>
The microprocessor 109 includes the SCSI bus control circuit 1
When it is determined that the SCSI command input to the HDD 05 is the authentication SCSI command (INQUIRY), the DVD-RAM drive 91 is transmitted via the SCSI bus control circuit 105.
0 in which the SCSI command (INQUIRY) is issued in the format shown in FIG.
Return to SI device. The device type code in the returned device attribute data is “10111” (AV disc recording device), as shown in FIG.

On the contrary, the microprocessor 109
S for authentication to SCSI device connected to SCSI bus
A CSI command (INQUIRY) is issued to receive attribute data of the target device, and this is stored in, for example, an internal memory in association with the ID code of the SCSI device. Conversely, the microprocessor 109 issues an authentication SCSI command (INQUIRY) to the target device to receive attribute data of the target device, and associates the attribute data with the ID code of the target device in the internal memory. Hold.

<AV data recording SCSI command (WR
ITE_AV)> The microprocessor 109 receives the input S
If it is determined that the CSI command is an AV data recording SCSI command (WRITE_AV), the SCSI bus control circuit 105 is controlled to receive 2054 bytes of digital data in a transfer unit, and to store the user data of the digital data in the user data memory 103. Next, the CGMS control data is stored in the CGMS control data memory 102.

Next, the CGMS data identification / update circuit 10
No. 4 determines whether the user data stored in the user data memory 103 is data permitted to be copied. Specifically, the CGMS code of the CGMS data is “1”.
Generation copy permission (d7, d6 = 1, 0) "or" copy permission (d
7, d6 = 0, 0) ", it is determined that the digital data is copy-permitted.
Reference numeral 9 refers to the attribute data of the device obtained and held by the mutual authentication performed in advance, and determines whether the SCSI device that has issued the SCSI command for writing AV data (WRITE_AV) is an AV device. judge.

As a result, if the SCSI device that has issued the AV data recording SCSI command (WRITE_AV) is an AV device and the user data is copy-permitted digital data, the CGMS data identification / update circuit 1
04 updates CGMS control data. Thereafter, the data recording circuit 101 stores the user data (2048 bytes)
Then, the updated CGMS control data (6 bytes) is recorded on the DVD-RAM 99.

On the other hand, according to the result of mutual authentication, SCSI
If the SCSI device that issued the command (WRITE_AV) is a non-AV device, or if the copy-inhibited digital data, specifically, the CGMS code is “copy-inhibited (d7, d6 = 1, 1)”, The user data replacement circuit 106 replaces the user data stored in the user data memory 103 with NULL data. After that, the data recording circuit 101 reads the NULL data (2048
Bytes) and CGMS control data (6 bytes)
It is recorded in the RAM 99. [AV Signal Processing Unit 47] FIG.
FIG. 3 is a block diagram showing a detailed configuration of FIG.

The AV signal processing section 47 further includes a connector 6
00, I / O bus control circuit 601, I / O command status register 602, SCSI bus control circuit 60
3. Data buffer 604, CGMS data detection / identification circuit 605, MPEG decoder 606, D / A conversion circuit 6
07, a control bus 608, an internal data bus 609, a microprocessor 610, and an interface connector 611.

The connector 600 connects the AV signal processing section 47 to the I / O bus. The I / O bus control circuit 601 includes:
This is a circuit for identifying information input from the I / O bus.
Specifically, if the input information is data, it is stored in the data buffer 604, and if it is a control command such as an I / O command, it is stored in the I / O command status register 602.

I / O command status register 6
Reference numeral 02 denotes a memory for temporarily storing commands input from the control unit 49 to the AV signal processing unit 47, processing results of the AV signal processing unit 47, and the like. The SCSI bus control circuit 603 is a controller of the SCSI bus, is connected to the SCSI bus 43 via the interface connector 611, and transmits and receives commands and data according to the SCSI standard. The SCSI bus control circuit 603 receives an AV data read SCSI command (READ_A
V) to the DVD-ROM 41,
By issuing a read request for AV data to the ROM 41 or issuing an AV data recording SCSI command (WRITE_AV) to the DVD-RAM drive 910;
AV data DV to VD-RAM drive 910
For example, a recording request to the D-RAM 99 is made.

The data buffer 604 includes a control bus 608
And a memory that receives data on the internal data bus 609 and temporarily stores the data. The CGMS data detection / identification circuit 605 outputs the CGMS data from the input digital data.
The control data is extracted, and the data attribute is determined from the value of the data attribute code in the control data. As a result, if the data is AV data, only the user data is output to the MPEG decoder 606,
If it is not AV data, the output of the digital data to the MPEG decoder 606 is interrupted.

The MPEG decoder 606 receives the input M
By subjecting digital data, which is a PEG stream, to predetermined decompression processing, the digital data is converted into video data and audio data and output. The D / A conversion circuit 607 converts the audio data output from the MPEG decoder 606 into an analog audio signal and outputs it.

The control bus 608 is connected to the microprocessor 6
This is a transmission path for instruction information issued from the server 10 and processing result information reported from each circuit. Internal data bus 60
Reference numeral 9 denotes a bus for connecting the I / O bus control circuit 601, the SCSI bus control circuit 603, the data buffer 604, and the CGMS data detection / identification circuit 605.

The interface connector 611 is a connector for connecting the AV signal processing unit 47 to the SCSI bus. The microprocessor 610 interprets the I / O command stored in the I / O command status register 602 and the SCSI command received by the SCSI bus control circuit 603 according to a built-in control program, and Performs overall control.

Hereinafter, an I / O command for reading data (IO_READ) and an I / O command for reproducing AV data (IO_PL)
AY), AV data copy I / O command (IO_COP
Y), the operation of the AV signal processing unit 47 when the authentication SCSI command (INQUIRY) is input will be described. <Authentication SCSI Command (INQUIRY)> The microprocessor 610 converts the SCSI command input to the SCSI bus control circuit 603 into an authentication SCSI command (INQU).
IRY), the SCSI bus control circuit 60
The device attribute data of the AV signal processing unit 47 is returned to the SCSI device that issued the SCSI command (INQUIRY) in the format shown in FIG. The device type code in the returned device attribute data is “100” as shown in FIG.
10 ″ (AV signal processing device).

<Data Read I / O Command (IO_R
EAD)> The microprocessor 610, when determining that the command stored in the I / O command status register 602 is a "data read I / O command (IO_READ)", controls the SCSI bus control circuit 603. A SCSI command (RE) for reading digital data from the DVD-ROM 41 is written to the DVD-ROM drive 46.
AD), the digital data received by the SCSI bus control circuit 603 is temporarily stored in the data buffer 604, and the I / O bus control circuit 601 is controlled to convert the digital data stored in the data buffer 604 into I / O data. Bus 42
Is output to the control unit 49 via the.

<AV data reproduction I / O command (IO_P
LAY)> The microprocessor 610, when determining that the command input to the I / O command status register 602 is an “AV data reproduction I / O command (IO_PLAY)”, performs mutual authentication with the DVD-ROM drive 46. I do. Specifically, it controls the SCSI bus control circuit 603 to transmit an authentication SCSI command (INQUIRY) to the DVD-ROM drive 46, and determines whether the data transfer source SCSI device is an AV device based on the returned device attribute data. Determine whether

As a result, when the SCSI device of the data transfer source is different from the AV device, the microprocessor 610 stores the error status in the I / O command status register 602 and ends the processing. On the other hand, when the data transfer source SCSI device is an AV device, the microprocessor
The CSI bus control circuit 603 is controlled to issue an AV data read SCSI command (READ_AV) to the DVD-ROM drive 46, and the transferred digital data is temporarily stored in the data buffer 604.

Thereafter, the digital data stored in the data buffer 604 is transferred to the CGMS data detection / identification circuit 605 by the microprocessor 610,
The GMS data detection identification circuit 605 determines whether or not the digital data is AV data. As a result, A
If the data is determined to be V data, the microprocessor 610
Transfers the digital data to the MPEG decoder 606. On the other hand, if the digital data is determined to be non-AV data,
The transfer to the EG decoder 606 is interrupted.

The digital data transferred to the MPEG decoder 606 is subjected to a predetermined decompression process, converted into video data and audio data, and output. The converted video data is output to the video signal processing unit 48, and the audio data is converted into an analog audio signal by the D / A conversion circuit 607, output to the outside, and audio output by the accompanying speaker 47S.

<AV data copy I / O command (IO
_COPY)> The microprocessor 610 determines that the command input to the I / O command status register 602 is “AV data copy I / O command (IO_COPY)”.
If it is determined that they are the same, mutual authentication is performed with the DVD-ROM drive 46 and the DVD-RAM drive 910 respectively. Specifically, it controls the SCSI bus control circuit 603 to transmit an authentication SCSI command (INQUIRY) to the DVD-ROM drive 46, and determines whether the data transfer source SCSI device is an AV device based on the returned device attribute data. Determine whether Similarly, DVD-RA
A SCSI command for authentication (INQUIR
Y), and it is determined based on the returned device attribute data whether the data transfer source SCSI device is an AV device.

As a result, when the SCSI device at either the data transfer source or the data transfer destination is different from the AV device, the microprocessor 610 sets the I / O
The error status is stored in the command status register 602, and the process ends. On the other hand, both the data transfer source and data transfer destination SCSI devices are AV
If it is a device, the microprocessor 610
Issues to the DVD-ROM drive 46 an AV data read SCSI command (READ_AV) accompanied by a sector number designating the AV data to be copied and the device attribute data “10111” of the DVD-RAM drive 910 as the copy destination. Then, the read and transferred digital data is temporarily stored in the data buffer 604. When the digital data is stored, the microprocessor 610
Is a SCSI command for recording AV data (WRITE_AV)
Is issued to the DVD-RAM drive 910, and the digital data stored in the buffer is output to the DVD-RAM drive 910. [Control Unit 49] The control unit 49 further includes a processor bus 49B, a CPU 49C, and a bus I / O, as shown in FIG.
F49I and main memory 49M. CPU49
C is a bus I / F 49I via a processor bus 49B.
And the main memory 49M. The CPU 49C
According to the OS loaded in the main memory 49M and the control program unique to the information processing system, the external instruction command received via the input unit 45 is interpreted and the DV
It takes out digital data from the D-ROM 41 and controls the transmission destination. The control unit 49 displays on the display device 48D as shown in FIG. 37, controls the keyboard 45K and the mouse 45M, and interacts with the user.

Note that the file management information of the DVD-ROM 41 is read from the DVD-ROM 41 in an initialization operation performed at the time of loading a disc or the like, and is held in the main memory 49M inside the control unit 49. As described above, by searching the file management information according to the ISO13346 standard, the recording address of the file stored in the DVD-ROM 41 can be obtained from the file name.

The control unit 49 controls the DVD through the input unit 45
When receiving an instruction to reproduce the AV data file in the ROM 41, “AV data reproduction control” is performed. When an instruction to copy the AV data file is received, “AV data copy control” is performed. And D
When a command to copy a file on the VD-ROM 41 is received, "data copy control" is performed.

In the “AV data reproduction control”, the control unit 49
Determines whether the specified file is a file that stores AV data. This is determined based on whether or not the directory name in which the specified file is stored is DVD-Video. As a result, if it is determined that the file is an AV data file, the AV data reproducing I / O
By issuing a command (IO_PLAY) to the AV signal processing unit 47 via the I / O bus 42, the reproduction of the AV data file is performed. On the other hand, if it is determined that the file is a non-AV data file, an error is notified to the user by a beep sound or the like.

In the “AV data copy control”, the control unit 4
No. 9 determines whether the specified file is a file storing AV data in the same manner as described above. As a result, if it is determined that the file is an AV data file, A
By issuing a V data reproduction I / O command (IO_COPY) to the AV signal processing unit 47 via the I / O bus 42,
The V data file is copied. On the other hand, if it is determined that the file is a non-AV data file, an error is notified to the user by a beep sound or the like.

In the “data copy control”, the control unit 49
Determines whether the specified file is a file storing AV data in the same manner as described above. as a result,
If it is determined that the file is a non-AV data file,
By issuing a data read I / O command (IO_READ) to the AV signal processing unit 47 via the O bus 42,
The V data file is copied. On the other hand, if it is determined that the file is an AV data file, an error is notified to the user by a beep sound or the like as copyright protection processing.

At the time of issuing the above-described I / O command, the control unit 49 includes, as accompanying parameters, an ID code for device identification for designating a drive for reading and writing data and a file for reading. Are output together with the start address and data length. [List of Commands] The meanings of the above-described I / O commands and SCSI commands are summarized in the tables shown in FIGS. 11A and 11B. That is, FIG.
The I / O command shown in FIG.
11B is a control command issued to the AV signal processing unit 47 from the control unit 49, and the SCSI command shown in FIG. 11B is a control command exchanged between SCSI devices via the SCSI bus 43. . (Operation of Information Processing System) Next, the operation of the information processing system configured as described above will be described with reference to a DVD-ROM.
The following describes three cases in which the file recorded in the file 41 is copied to the DVD-RAM 99, copied to the HD device 44, and reproduced. As described above, the DVD-ROM 41 is a DVD-R
It is assumed that file management information is held in the main memory 49M of the control unit 49 as an initialization operation when the OM drive 46 is mounted. [Copy to DVD-RAM99] First, DVD-RO
The operation of the information processing system when the M41 AV data file is copied to the DVD-RAM 99 will be described.

FIG. 12 is a flowchart showing a processing procedure for copying the AV data file of the DVD-ROM 41 to the DVD-RAM 99. FIG. 13 shows a control unit 49, an AV signal processing unit 47, and a DVD-R in the above copy.
FIG. 9 is a communication sequence diagram showing exchange of communication between the OM drive 46 and the DVD-RAM drive 910.

First, when the control unit 49 receives a file copy request from the user via the input unit 45, it is determined whether or not the file is an AV data file by referring to the directory name in which the file is stored (S30).
0, S301). As a result, if the control unit 49 determines that the specified file is a non-AV data file, it notifies the user of an error message and ends the operation (S
303, S304).

On the other hand, if the control unit 49 determines that the specified file is an AV data file, it sends an AV data copy I / O command (IO_COP
Y) is issued (S302, Q300). AV signal processing unit 47 receiving the I / O command (IO_COPY)
Issues an authentication SCSI command (INQUIRY) to the DVD-ROM drive 46 to perform mutual AV device authentication (S305, Q301 to Q304).

Then, the AV signal processing section 47
The authentication SCSI command (INQUIRY) is also issued to the RAM drive 910 to perform mutual AV device authentication (S306, Q305 to Q308). If both of the two AV device mutual authentications have succeeded normally, the AV signal processing unit 47 first sends an AV data reading SCSI command (READ_A) to the DVD-ROM drive 46.
V) is issued (S307, Q309).

The DVD-ROM drive 46 receiving the command reads the digital data and transfers it to the AV signal processing section 47 (processing H, Q310). FIG. 14 is a flowchart illustrating a detailed procedure of the process H. The DVD-ROM drive 46 that has received the SCSI command for reading AV data (READ_AV) reads the data from the specified address of the DVD-ROM 41, stores the CGMS control data in the CGMS control data memory 502, and stores the user data for the user data. Each is stored in the memory 503 (S321).

Next, the DVD-ROM 41 determines whether the sector data is copyable data based on the CGMS control data (S322). Specifically, CGM
The S data identification circuit 504 refers to the CGMS control data stored in the CGMS control data memory 502 to thereby determine the data attribute (“unspecified” or “AV data”) of the user data stored in the user data memory 503. "
) And copy restriction information (“copy permitted” (d7, d6 = 0,
0), “one-generation copy permitted” (d7, d6 = 1, 0) or “copy not permitted” (d7, d6 = 1, 1).

Next, the DVD-ROM drive 46
It is determined whether the AV device mutual authentication has been successful (that is, the data receiving device is a legitimate data receiving device) (S323). As a result, if the mutual authentication is successful and the AV data is “copy permitted” or “one generation copy permitted” according to the identification in step S322, the CGMS control data (6 bytes) and the user data (2048) The sector data is converted to the AV signal
(S325). Otherwise, DVD
-The ROM drive 46 converts the user data into NULL data by the user data replacement circuit 506 (S
324) to the AV signal processing unit 47 (S32).
5).

When the above processing H is completed, the DVD-RO
AV receiving digital data from M drive 46
The signal processing unit 47 stores the DVD-RAM drive 910 with A
A V data recording SCSI command (WRITE_AV) is issued (Q311), and the digital data is transferred. (S3
08, Q312). The DVD-RAM drive 910 that has received the digital data transferred from the AV signal processing unit 47 performs recording on the DVD-RAM 99 (processing I, Q311 to Q313).

FIG. 15 is a flowchart showing a detailed procedure of the processing I. The DVD-RAM drive 910 is
When the digital data is received, it is separated into CGMS control data and user data (S331). Specifically, the user data in the digital data is stored in the user data memory 103, and the CGMS control data is stored in the CGMS control data memory 102.

Next, the DVD-RAM drive 910
It is determined whether the user data stored in the user data memory 103 is data permitted to be copied (S
332). Specifically, if the CGMS code in the CGMS data is “1 generation copy permitted (d7, d6 = 1, 0)” or “copy permitted (d7, d6 = 0, 0)”, the digital data is copy permitted. It is determined that there is.

Subsequently, the DVD-RAM drive 910
Is the AV device mutual authentication (Q307, Q3
08) is successful, and it is determined whether the user data is copy-permitted (S333). The success of this mutual authentication can be determined by referring to the attribute data of the device acquired and held by the mutual authentication by the SCSI command (WRIT
The determination is made based on whether or not the SCSI device that has issued (E_AV) is an AV device.

As a result, if the above judgment (S333) is not satisfied, ie, the mutual authentication has failed,
Or, if digital data is copy-protected, DV
The D-RAM drive 910 stores the user data memory 1
03 is replaced with NULL data (S334). On the other hand, if you are satisfied,
-The RAM drive 910 updates the CGMS control data (S335). Specifically, the CGMS code is “1”
Generation copy permission (d7, d6 = 1,0) "
Rewrite to "copy prohibited (d7, d6 = 1, 1)" (S33)
5).

Then, the DVD-RAM drive 910
Records the user data and the updated CGMS control data in the DVD-RAM 99 (S336).
By repeating the above processing (processing H to processing I) by the designated transfer length, the digital data recorded on the DVD-ROM 41 is protected by the DVD-ROM while the copyright protection processing is being performed.
The data is copied to the RAM 99 (S309, S310). [Copy to HD device 44] Next, the DVD-ROM 41
The operation of the information processing system when the file is copied to the HD device 44 will be described.

FIG. 16 is a flowchart showing a processing procedure for copying a file from the DVD-ROM 41 to the HD device 44. FIG. 17A shows that the file is non-AV
The communication between the control unit 49, the AV signal processing unit 47, the DVD-ROM drive 46, and the HD device 44 when the data is a data file and the data read from the DVD-ROM drive 46 is non-AV data. FIG. 7 is a communication sequence diagram showing exchange.

FIG. 17B shows a case where the file is a non-AV data file, but the data read from the DVD-ROM drive 46 is AV data. -ROM drive 4
6 is a communication sequence diagram showing communication exchanges between the HD device 6 and the HD device 44. FIG. First, when the control unit 49 receives a request to copy a file from the user via the input unit 45, the control unit 49 determines whether or not the file is an AV data file by referring to the directory name storing the file (S201, S202).

As a result, if the control unit 49 determines that the specified file is an AV data file, it notifies the user of an error message and ends the operation (S20).
2, S204, S213). On the other hand, if the control unit 49 determines that the specified file is a non-AV data file, it issues a data read I / O command (IO_READ) to the AV signal processing unit 47 (S202, S203, Q
200, Q210).

Data read I / O command (IO_REA
D) receiving the D), the DVD-RO
Issues a data read SCSI command (READ) to the M drive 46 (S205, Q201, Q21)
1). Upon receiving the command, the DVD-ROM drive 46 reads the designated digital data and
The data is transferred to the control unit 49 via the signal processing unit 47 (process C, Q202 to Q203, Q212 to Q213).

FIG. 18 is a flowchart showing a detailed processing procedure of the processing C. DVD-ROM drive 46 that has received a data read SCSI command (READ)
Reads digital data from a specified address of the DVD-ROM 41 and detects CGMS control data accompanying user data of the digital data (S20).
6). Then, the DVD-ROM drive 46 determines whether the data attribute of the user data is AV data according to the detected CGMS control data (S207).

As a result, the DVD-ROM drive 46
Transfers the user data (2048 bytes) to the AV signal processing unit 47 if the data attribute of the read user data is determined to be non-AV data (S209, Q2).
02). Conversely, if the DVD-ROM drive 46 determines that the data attribute of the read user data is AV data, the DVD-ROM drive 46 replaces the user data with the user data replacement circuit 506.
AV signal processing unit 4 after replacing with NULL data by
7 (S208, Q212).

The digital data transferred to the AV signal processing section 47 is transferred again to the control section 49 (Q203, Q21).
3) The writing process is performed on the HD device 44 by the control unit 49 and recorded on the HD device 44 (S210, Q20)
4-Q207, Q214-Q217). Specifically, the control unit 49 sets the HD device 44 as the output destination SCSI device.
The digital data read out together with the write I / O command (IO_WRITE) designating the data is output to the AV signal processing unit 47 again (Q204, Q214). AV signal processing unit 4
7 is a SCSI for writing input digital data.
Write to HD device 44 by command (WRITE) (Q20
5 to Q207, Q215 to Q217).

By repeating the above processing (processing C, S210) by the designated transfer length, the AV data file recorded on the DVD-ROM 41 is replaced with NULL for the non-AV data as it is and for the AV data as it is. After that, each is copied to the HD device 44 (S2
11, S212). [Reproduction] Next, the operation of the information processing system when an AV data file recorded on the DVD-ROM 41 is reproduced will be described.

FIG. 19 is a flowchart showing a processing procedure when an AV data file recorded on the DVD-ROM 41 is reproduced. FIG. 20 is a communication sequence diagram showing the exchange of communication performed between the control unit 49, the AV signal processing unit 47, and the DVD-ROM drive 46 in the reproduction. First, when the control unit 49 receives a request to reproduce a designated file from the user via the input unit 45 (S
100), it is determined whether or not the specified file is an AV data file by referring to a directory name for storing the file (S101).

The control unit 49 determines that the specified file is an AV file.
If it is determined that the file is a data file, the AV signal processing unit 4
7 to request reading from the DVD-ROM drive 46 to the AV data reproducing I / O command (IO_PLA
Y) is issued (S102, Q100). On the other hand, non-AV
If it is determined that the file is a data file, an error process (for example, an error is notified to the user by a beep sound) is performed (S103), and the process ends (S104).

An I / O command for reproducing AV data (IO_PLA
Y), the AV signal processing unit 47 receives the DVD-RO
A SCSI command for authentication (INQU
IRY) to perform AV device mutual authentication (S10).
5, Q101 to Q104). If the AV device mutual authentication has succeeded normally, the AV signal processing unit 47 sets the DVD-R
SCS for reading AV data to OM drive 46
Issue an I command (READ_AV) (S106, Q10)
5).

The DVD-ROM drive 46 receiving the command reads and transfers data (Process A,
Q106). FIG. 21 is a flowchart showing a detailed procedure of the process A. DVD-ROM drive 46 that has received a SCSI command (READ_AV) for reading AV data
Reads the data from the specified address of the DVD-ROM 41, and stores the CGMS control data in the CGMS control data memory 502 and the user data in the user data memory 503, respectively (S107).

Next, the CGMS data identification circuit 504
It is determined whether the sector data is AV data based on the CGMS control data (S108). If the sector data is not AV data, the process jumps to step S111. If the sector data is AV data, the process proceeds to step S109. The DVD-ROM drive 46 is
It is determined whether the AV device mutual authentication has succeeded (that is, the data receiving device is a legitimate data receiving device) (S109). If successful, CGMS control data (6 bytes) and user data (2048 bytes)
2054 bytes, which is the sum of
The sector data is transferred to the AV signal processing unit 47 (S11).
1). If not successful, DVD-ROM drive 4
6 converts the user data into NULL data by the user data replacement circuit 506 (S110),
The data is transferred to the signal processing unit 47 (S111).

When the above process A is completed, the AV signal processing section 47 performs a video output process (process B). FIG.
13 is a flowchart illustrating a detailed procedure of a process B. AV
The signal processing unit 47 receives the digital data from the DVD-ROM drive 46 and separates the digital data into CGMS control data and user data (S112).

Then, the AV signal processing unit 47 determines whether or not the AV device mutual authentication has succeeded (that is, the data transmission device is a legitimate data transmission device) (S
113). If not successful, the process B ends. On the other hand, if successful, it is determined whether the user data is AV data by referring to the CGMS control data. As a result, if the user data is not AV data,
The process B ends. On the other hand, if the user data is AV data, the decoding process of the user data is performed, the obtained video data is output to the video signal processing unit 48, and the audio data is D / A converted and then converted to the speaker 47S as an analog audio signal. Output (S115).

The analog audio signal is output from the accompanying speaker 47S, and the video data is subjected to synthesis processing with the graphics data by the video signal processing unit 48, converted into an analog video signal, and output from the accompanying display device 48D. An image is displayed (S116), whereby the process B ends. The above-described series of processing (processing A and processing B) is repeated by the designated transfer length, thereby completing the reproduction processing of the AV data file (S1).
17, S118, Q107). [Summary] As described above, in the data transmission device (DVD-ROM drive 46) of the information processing system according to the present invention, it is determined that the digital data includes the AV data, and the data reception device is a legitimate data reception device. A control unit is provided which controls to output the AV data together with the specification information of the usage form of the AV data only when it is authenticated.

In the data receiving apparatus (AV signal processing unit 47, DVD-RAM drive 910) of the information processing system according to the present invention, the specification information of the usage form of the AV data is determined, and the range of the specified usage form is determined. It has a function of reproducing or recording the input AV data, and has an authentication unit that generates and outputs authentication data indicating the AV data.

Thus, the information processing system including the data transmitting device and the data receiving device of the present invention outputs AV data to a SCSI device other than a legitimate data receiving device that handles AV data within the specified use form. Is prohibited. Further, according to the information processing system of the present embodiment, as can be seen from the communication sequence diagrams of FIGS.
Transferred between I devices. As a result, an erroneous operation in which AV data is extracted while passing through the control unit 49 due to an error in the reproduction control program or the like is avoided.

In the information recording medium of this embodiment, whether or not digital data is AV data is recorded in a state in which the digital data can be authenticated at both the file management level and the sector management level. Information for specifying the range of the usage form is also recorded. Therefore, the digital data can be identified by a device (for example, a personal computer) that authenticates only at the file management level or a device (for example, a disk drive) that authenticates only at the sector management level. In the case of AV data, it is also possible to confirm the usage form. Therefore, the information recording medium of the present embodiment is suitable for a system such as the present information processing system including a personal computer and a disk drive.

Thus, authentication and decryption are linked,
A stronger copy guard is realized. The information processing system according to the first embodiment has been described above, but it goes without saying that the present invention is not limited to this embodiment. For example, the information recording medium (DVD-RAM 99) recorded by the DVD-RAM drive 910 is a rewritable DVD, but a write-once DVD that can be written only once, and other MO (Magneto-Optical disk). Etc. may be used.

In this embodiment, the reproduction and copying of digital data are realized by the intervening of the AV signal processing section 47, but the present invention is not limited to this. DVD-RO
A system in which the M41 and the DVD-RAM drive 910 directly communicate with each other as a SCSI controller may be used. In the information processing system according to the present embodiment, the DVD-R
It is preferable to set specific parameters of the video information stored in the OM 41 as follows. That is, high-resolution moving image information having a horizontal resolution of 450 or more
DVD-ROM 41 as data conforming to the PEG standard (that is, as digital data compressed between frames)
It is desirable to record it. This is because the image quality is high enough for movie applications, and the effect of the present invention on copyright protection is extremely effective.

In this embodiment, the CGMS code has only three types, that is, copy permission, one-generation copy permission, and copy prohibition. However, by using a reserved code (d7 = 0, d6 = 1), etc. And copy permission for up to three generations, and the DVD-RAM drive 910
It goes without saying that by updating the GMS code, it is possible to perform a copyright protection process corresponding to a more detailed usage form. (Second Embodiment) Next, an information processing system according to a second embodiment of the present invention will be described.

An information processing system according to the second embodiment has a D
Digital data recorded on the VD is read out and processed (reproduced and copied) within the range of use specified by the copyright holder. Mutual authentication and data transfer are performed using encryption. . (Configuration of Information Processing System) FIG. 23 is a diagram showing the appearance of an information processing system according to the second embodiment, and FIG.
FIG. 1 is a functional block diagram illustrating a configuration of an information processing system according to an embodiment.

The present information processing system includes a control unit 1049,
I / O bus 1042, input unit 45, keyboard 45K,
Mouse 45M, HD device 44, DVD-ROM drive 1046, DVD-ROM 41, DVD-RAM drive 1910, DVD-RAM 99, AV signal processing unit 10
47, video signal processing unit 48, display device 48D
And a speaker 47S. Among these components, the same components as those of the information processing system of the first embodiment are denoted by the same reference numerals.

As can be seen by comparing FIGS. 2 and 24, the information processing system has the same basic components as those of the first embodiment, but differs in the following points. In this information processing system, the SCSI interface which is the external bus used in the first embodiment is not used, and the main components 1049, 44, 1046, 1910 and 1047 are all connected to the I / O bus 1042 which is the internal bus. Connected, FIG. 23
Are housed in one chassis as shown in FIG.

This I / O bus 1042 is, specifically,
It is a digital interface called ATAPI (AT Attachment PacketInterface). In the ATAPI, unlike the SCSI, the control unit 1049
Other than that, there is a restriction that it cannot be a bus master. That is, a DVD-ROM drive 1046 like SCSI
And AV signal processing unit 1047 cannot directly exchange AV data and commands, and all of the AV data and commands are relayed by control unit 1049. This means that AV data is likely to be illegally copied in the control unit 1049.

Therefore, the information processing system according to the second embodiment uses a data transmission device (DVD-ROM drive 104) to protect AV data at a high security level.
6) and a data receiving device (AV signal processing unit 1047, D
The VD-RAM drive 1910) includes components for performing not only mutual authentication but also data encryption and decryption. As a result, if the I / O bus 1042
Even when data is illegally copied or extracted due to malfunction, the copyright of the AV data is protected because the AV data is encrypted.

In the following, each configuration and operation of the information processing system will be described, focusing on differences from the first embodiment. [DVD-ROM drive 1046] FIG.
FIG. 3 is a block diagram illustrating a detailed configuration of a ROM drive 1046.

The DVD-ROM drive 46 further includes an interface connector 1500, a data read circuit 5
01, CGMS control data memory 502, user data memory 503, CGMS data identification circuit 504, interface control circuit 1505, user data replacement circuit 506, internal data bus 507, control bus 508, microprocessor 1509, and encryption / authentication circuit 1510 Consists of DVD-ROM drive 4 of the first embodiment
The components different from 6 are as follows.

The interface connector 1500 is connected to the I / O
A connector for connecting the O bus 1042 and the DVD-ROM drive 1046. Interface control circuit 150
Reference numeral 5 controls transmission and reception of commands and data via the I / O bus 1042 according to the ATAPI method. The microprocessor 1509 interprets the command received by the interface control circuit 1505 according to a built-in control program, and controls the entire DVD-ROM drive 1046. Specific commands and control contents will be described later.

In accordance with an instruction from microprocessor 1509, encryption / authentication circuit 1510
Authentication processing and encryption processing prior to the output of the digital data to 2 are performed. The authentication process performed by the encryption / authentication circuit 1510 is different from the mutual authentication of the AV device in the first embodiment. By transmitting and receiving the authentication data between the data transmitting device and the data receiving device, the other parties can mutually communicate. This is done by authenticating that the device is legitimate. This authentication process includes three steps: authentication data generation, authentication result determination, and certification data generation. On the other hand,
The encryption process performed by the authentication circuit 1510 is a DVD-ROM
This is a process for encrypting the digital data read from 41, and includes two steps of encryption key generation and encryption.

The encryption / authentication circuit 1510 performs a random number generation operation and an operation using the encryption function E (KEY1, DATA) in the above-described encryption processing and authentication processing. Less than,
The contents of these calculations and their features will be described. Encryption function E
(KEY1, DATA) uses the encryption key `` KEY1 '' for the data `` DAT
A means to convert "A" with a certain encryption algorithm. Then, there is a decryption function D (KEY2, DATA) which is an inverse function of the encryption function E (KEY1, DATA). Where KEY
2 is a decryption key. That is, the encrypted data is transferred to Enc
When ryptData = E (KEY1, Data), Data = D (KEY2,
EncryptData) holds. That is, the encryption function E (KEY
(1) DATA), the data EncryptData encrypted is subjected to an operation using the decryption function D (KEY2, DATA), that is, D (K
By calculating (EY2, EncryptData), the original data Data can be decrypted. Note that the encryption function in the present embodiment
In E (KEY1, DATA) and decryption function D (KEY2, DATA), it is assumed that the encryption key “KEY1” = the decryption key “KEY2” (= “KEY”), and thereafter, the encryption key and the decryption key are equal It will be described as an example.

On the other hand, the random number generation operation means generating a 16-bit random number here. Typically, it is generated using dynamic hardware values. For example, since initialization data different for each application stored in the lead-in area of the DVD is held inside the DVD drive prior to reading, this value or the like can be used. In addition, a timer is provided separately,
This may be used.

The functions of the encryption / authentication circuit 1510, that is, generation of authentication data, determination of an authentication result, generation of certification data, generation of an encryption key, and encryption will be described in order. <Generation of Authentication Data> First, generation of authentication data performed by the encryption / authentication circuit 1510 will be described. Encryption / authentication circuit 151
0 first generates two random numbers R1 and R2 (both of which are 16 bits as described above). Next, the random number R1 is allocated to the upper 16 bits and the random number R2 is allocated to the lower 16 bits.
Generate a 2-bit value. The 32-bit data is referred to as “data R1 || R2”.

The encryption / authentication circuit 1510 encrypts the data R1 || R2 according to the encryption function E (KEY, DATA) using the encryption key S stored in advance, thereby obtaining the authentication data. Generate C1. That is, the authentication data C1
= E (S, R1 || R2) holds. <Authentication Result Determination> Next, the authentication result determination performed by the encryption / authentication circuit 1510 will be described.

The authentication result is determined by the data transmitting device D
The VD-ROM drive 1046 is connected to the data receiving device (A
V signal processing unit 1047, DVD-RAM drive 191
0) is a process for authenticating whether or not the device is a legitimate data receiving device. This authentication is performed when the data receiving device uses the decryption function.
This is performed by determining whether or not D (KEY, DATA) and the decryption key S are present. This determination is specifically made in the following procedure.

First, the DVD-ROM drive 1046
Authentication data C1 obtained by generating authentication data
(= E (S, R1 || R2)) is output to the data receiving apparatus to be authenticated. The data receiving device uses the decryption key S for the received authentication data C1 to use the decryption function D (KEY, DAT
By performing decryption according to A), a value corresponding to the random number R2 is specified, and the value is used as the certification data K1 in the DVD-RO.
Return to M drive 1046.

If the data receiving apparatus determines that the decryption function D (KEY, DA
TA) and the decryption key S, the random number R2 should be able to be calculated from the authentication data C1. This is because the data receiving device can decode the authentication data C1 into data R1 || R2 and specify the random number R2, which is the lower 16 bits. In the DVD-ROM drive 1046,
The encryption / authentication circuit 1510 determines an authentication result using the certification data K1 received from the data receiving device. Specifically, if K1 = R2, the microprocessor 1509 is notified of the success of the authentication. If K1 = R2, the microprocessor 1509 is notified of the failure of the authentication.

In this way, the DVD-ROM drive 1046 authenticates that the data receiving device is a legitimate data receiving device. <Generation of Proof Data> Next, the generation of proof data performed by the encryption / authentication circuit 1510 will be described. In order to complete the mutual authentication, the data receiving device must be a DVD-ROM drive 10
46 need to be authenticated. At this time, DVD-R
The OM drive 1046 generates the certification data for certifying to the data receiving device that the data receiving device is a legitimate data transmitting device in a position opposite to the above.

More specifically, first, the data receiving apparatus
R3 || R4 generated from two random numbers R3 and R4
Is converted by the decryption function D (KEY, DATA) and the decryption key S to output the authentication data C2 to the DVD-ROM drive 1046. That is, the authentication data C2 is D (S,
R3 || R4). And a DVD-ROM drive 1
In step 046, the encryption / authentication circuit 1510 obtains a value corresponding to the random number R4 from the authentication data C2 using the encryption function E (KEY, DATA) and the encryption key S owned by itself, and It is returned to the data receiving device as K2. That is, data R3 || R4 is obtained by the operation of E (S, C2), and the value corresponding to the random number R4 further obtained from this is set as the proof data K2. The data receiving device determines the authentication result using the certification data K2 from the data transmitting device. That is, if K2 = R4, the authentication is successful, and if K2 = R4, the authentication fails.

<Encryption Key Generation> Next, the encryption / authentication circuit 151
0 will be described. The encryption key here is
This is a secret key used to encrypt digital data read from the DVD-ROM 41. In accordance with an instruction from the microprocessor 1509, the encryption / authentication circuit 1510 uses the random number R1 and the random number R3 acquired in the respective processes of the authentication data generation and the certification data generation performed in advance, to generate the data R1 | | Create R3,
This is generated as an encryption key. Therefore, this encryption key has a different value for each authentication performed between the DVD-ROM drive 1046 and the data transfer destination device.

<Encryption> Next, the encryption performed by the encryption / authentication circuit 1510 will be described. The encryption here is DVD-R
This is a secret key used to encrypt digital data read from the OM 41. Encryption / authentication circuit 151
0 encrypts digital data read from the DVD-ROM 41 in accordance with an instruction from the microprocessor 1509 using an encryption key R1 || R3 generated by encryption key generation according to an encryption function E (KEY, DATA). . That is, the input data is Data, and the encrypted data is En
If cryptData is set, the operation of EncryptData = E (R1 || R3, Data) is performed.

Next, the DVD-ROM drive 104
The operation in the case where various commands are input to 6 will be described.
The commands received by the DVD-ROM drive 1046 include a data read command (READ), an AV data read command (READ_AV), a data receiver authentication command (CHALLENGE_RECEIVER), a data receiver confirmation command (CONFIRM_RECEIVER), and a data receiver command. There is a transmitting device certification command (PROOF_SENDER) and a certification data acquisition command (GET_PROOF_INFO).

Among them, the DVD-ROM drive 1 when the data read command (READ) is input
046 is the data reading SCSI of the first embodiment.
Since this is the same as the command (READ), other commands will be described. The latter four commands (CHAL
LENGE_RECEIVER, CONFIRM_RECEIVER, PROOF_SENDER, GE
T_PROOF_INFO) is a command for reading AV data (RE
AD_AV) is a command for a series of authentication processes performed prior to input of AD_AV).

<Data receiving device authentication command (CHALLE
NGE_RECEIVER)> The microprocessor 1509 determines that the input command is a data receiving device authentication command (CHAL
(LENGE_RECEIVER), the authentication / authentication circuit 1510 generates authentication data and starts the interface control circuit 150 in order to start authentication of the data receiving device.
5 to the control unit 1049.

<Data receiving device confirmation command (CONFIR
M_RECEIVER)> The microprocessor 1509 determines that the input command is a data receiving device confirmation command (CONFIR
If M_RECEIVER), the encryption / authentication circuit 1510 verifies the certification data input together with the command in order to determine the success or failure of the authentication. Then, the authentication result is held inside.

<Data transmission device certification command (PROOF_
SENDER)> The microprocessor 1509 determines that the input command is a data transmission device certification command (PROOF_SEND).
ER), the encryption / authentication circuit 1510 generates authentication data from the authentication data input in conjunction with the command in order to prove that the device is a legitimate data transmission device. Control to keep it inside.

<Proof data acquisition command (GET_PROO)
F_INFO)> The microprocessor 1509 determines that the input command is a certification data acquisition command (GET_PROOF_IN).
If FO) is determined, control is performed to output the certification data held therein to the control unit 1049 via the interface control circuit 1505 in order to transmit the certification data to the data receiving device.

<AV data read command (READ_A
V)> If the microprocessor 1509 determines that the input command is an AV data read command (READ_AV), the microprocessor 1509 performs processing in addition to the processing when the AV data read SCSI command (READ_AV) is input in the first embodiment. Then, an encryption key is generated and encrypted.

In other words, if the digital data read from the DVD-ROM 41 is AV data and the authentication of the data receiving device has been successful, the encryption / authentication circuit 1510 generates an encryption key, and User data (2048) stored in the user data memory 503 using
Bytes). And the microprocessor 1
The control unit 1049 outputs a total of 2054 bytes of digital data of the encrypted user data (2048 bytes) and the CGMS control data (6 bytes) stored in the CGMS control data memory 502.

In other cases, the process is the same as that in the first embodiment when the SCSI command for reading AV data (READ_AV) is input. [DVD-RAM drive 1
910] FIG. 26 is a block diagram showing a detailed configuration of the DVD-RAM drive 1910.

The DVD-RAM drive 1910 further includes an interface connector 1100, a data recording circuit 101, a CGMS control data memory 102, a user data memory 103, and a CGMS data identification / update circuit 1.
04, interface control circuit 1105, user data replacement circuit 106, internal data bus 107, control bus 10
8. Microprocessor 1109 and decryption / authentication circuit 1
110. The components that differ from the DVD-RAM drive 910 of the first embodiment are as follows.

The connector 1100 is connected to the I / O bus 1042
And a DVD-RAM drive 1910. The interface control circuit 1105 uses the ATAP
According to the I method, transmission and reception of commands and data are controlled via the I / O bus 1042. Microprocessor 1
The unit 109 interprets the command received by the interface control circuit 1105 according to a built-in control program, and controls the entire DVD-RAM drive 1910.
Specific commands and control contents will be described later.

The decryption / authentication circuit 1110 performs an authentication process and a decryption process according to an instruction from the microprocessor 1109. This authentication process is a process for authenticating the data transmission device, and includes three steps of generating certification data, generating authentication data, and determining an authentication result. On the other hand, the decryption process is a process for decrypting the input encrypted digital data, and includes two steps of decryption key generation and decryption.

The decryption / authentication circuit 1110 performs a random number generation operation and an operation using the decryption function D (KEY, DATA) in the above-described decryption process and authentication process. This decryption function D (KEY, DATA) is stored in the DVD-ROM drive 104
6 encryption function E (KEY, DA
It is the inverse function of TA). <Generation of certification data> The certification data generation is performed so that the DVD-RAM drive 1910, which is the data receiving device, proves its validity to the data transmitting device, that is, that it is a legitimate data receiving device. This is the process.

More specifically, the decryption / authentication circuit 1110
The authentication data C1 (=
E (S, R1 || R2)) is decrypted by the decryption function D (KEY, DATA) using the encryption key S stored internally in advance, and the resulting data (= R1 || R2) from the random number R2,
It is returned to the data transmitting device as proof data K1. <Generation of authentication data> DVD-R
The AM drive 1910 is a process for authenticating that the data transmission device is a legitimate data transmission device.

More specifically, the decryption / authentication circuit 1110
Generate two random numbers R3 and R4 consisting of 16 bits,
32-bit data R3 || R4 in which the random number R3 is arranged in the upper 16 bits and the random number R4 is arranged in the lower 16 bits is generated.
Subsequently, the decryption / authentication circuit 1110 converts the data R3 || R4 into a decryption function D (KEY, DATA) using the encryption key S.
, The authentication data C2 (= D (S,
R3 || R4)).

<Judgment of Authentication Result>
A process for determining whether or not the RAM drive 1910 has succeeded in authenticating that the data transmission device is a legitimate data transmission device. Specifically, the decryption / authentication circuit 1110 determines whether the proof data K2 returned from the data transmission device is equal to the random number R4. If they are equal, it means that the authentication was successful.

<Decryption Key Generation> The decryption key generation is a process of generating a key for decrypting the encrypted digital data sent from the data transmitting device. Specifically, the decryption / authentication circuit 1110 generates the random numbers R1 and R2 obtained in the process of generating the certification data and the authentication data.
3 to generate a decryption key R1 || R3.

<Decryption> Decryption is a process of decrypting the encrypted digital data sent from the data transmission device. Specifically, the decryption / authentication circuit 1110 decrypts the digital data by using the decryption key obtained by the decryption key generation, using a decryption function D (KEY, DATA).

[0179] This is because the encrypted digital data EncryptData sent from the data transmitting device uses the encryption function E (KE
(E, R1 || R3, Dat
a)) So this encrypted digital data EncryptD
decryption function D (KEY, DAT) for ata using decryption key R1 || R3
A) (= D (R1 || R3, EncryptData)
Is equal to the original digital data Data.

Next, the data receiving device certification command (PR
OOF_RECEIVER), certification data acquisition command (GET_PR
OOF_INFO), data transmission device authentication command (CHALLENG
E_SENDER), data transmission device confirmation command (CONFIRM_
SENDER) and the operation of the DVD-RAM drive 1910 when an AV data write command (WRITE_AV) is input.

It should be noted that four of the above commands PROOF_RECE
IVER, GET_PROOF_INFO, CHALLENGE_SENDER, CONFIRM_SE
NDER is a command for a series of authentication processes performed prior to input of an AV data recording command (WRITE_AV). <Data receiving device certification command (PROOF_RECEIVER)>
If the microprocessor 1109 determines that the input command is a data receiving device certifying command (PROOF_RECEIVER), the microprocessor 1109 authenticates the input command together with the command to certify that it is a proper data receiving device. Data for certification is generated by the decryption / authentication circuit 1110 from the data for certification, and control for retaining the data inside is performed.

<Proof data acquisition command (GET_PROO)
F_INFO)> The microprocessor 1109 determines that the input command is a certification data acquisition command (GET_PROOF_IN).
If FO) is determined, control is performed to output the certification data held therein to the control unit 1049 via the interface control circuit 1105 in order to return the certification data.

<Data transmission device authentication command (CHALLE
NGE_SENDER)> The microprocessor 1109 determines that the input command is a data transmission device authentication command (CHALLE
NGE_SENDER), the decryption / authentication circuit 1110 generates authentication data to start the authentication of the data transmission device, and the interface control circuit 1105
Control to output to the control unit 1049 via the.

<Data transmission device confirmation command (CONFIR
M_SENDER)> The microprocessor 1109 converts the input command into a data transmission device confirmation command (CONFIRM_
SENDER), in order to determine the success or failure of the authentication, control is performed by verifying the proof data input together with the command by the decryption / authentication circuit 1110 and determining whether the authentication is successful. Do. In addition, whether the authentication result is correct or not is stored therein.

<AV data recording command (WRITE_AV)
> If the microprocessor 1109 determines that the input command is an AV data recording command (WRITE_AV), the AV data recording SCSI according to the first embodiment.
In addition to the processing when a command (WRITE_AV) is input, a decryption key is generated and decrypted.

More specifically, the microprocessor 1109
Receives digital data in a transfer unit of 2054 bytes, stores user data of the digital data in the user data memory 103, and stores CGMS control data in the CGMS
It is stored in the control data memory 102. Next, CGMS
The identification / update circuit 104 includes a user data memory 103
It is determined whether or not the user data stored in the file is data permitted to be copied. Specifically, C of CGMS data
GMS code is "1 generation copy permitted (d7, d6 = 1,0)"
Alternatively, if “copy permitted (d7, d6 = 0, 0)”, it is determined that the digital data is copy-permitted. Further, the microprocessor 1109 determines whether or not the authentication performed in advance has been successful.

As a result, if the data transmitting device is a legitimate data transmitting device and the user data is copy-permitted digital data, the CGMS identification / update circuit 104
Updates the CGMS control data. Then, the decryption / authentication circuit 1110 generates a decryption key, and decrypts the user data using the decryption key. After that, the data recording circuit 101
The decrypted user data (2048 bytes) and the updated CGMS control data (6 bytes)
It is recorded in the RAM 99.

On the other hand, when the data transmitting device is not a legitimate data transmitting device, or when digital data whose copy is prohibited, specifically, the CGMS code is “copy prohibited (d7, d6
= 1,1) ”, the user data replacement circuit 106
Replaces the user data stored in the user data memory 103 with NULL data. Thereafter, the data recording circuit 101 reads the NULL data (2048 bytes)
And CGMS control data (6 bytes) in DVD-RAM9
Record in 9. [AV Signal Processing Unit 1047] FIG. 27 is a block diagram showing a detailed configuration of AV signal processing unit 1047.

The AV signal processing unit 1047 further includes a connector 1600, an I / O bus control circuit 1601, an I / O command status register 602, and a decryption / authentication circuit 1.
603, a data buffer 604, a CGMS data detection / identification circuit 605, an MPEG decoder 606, a D / A conversion circuit 607, a control bus 608, an internal data bus 609, and a microprocessor 1610. The components that are different from the AV signal processing unit 1047 of the first embodiment are as follows.

The connector 1600 is connected to the I / O bus 1042
And an AV signal processing unit 1047.
The interface control circuit 1601 controls transmission and reception of commands and data via the I / O bus 1042 according to the ATAPI method. Microprocessor 1610
Interprets the command stored in the I / O command status register register 602 according to a built-in control program, and controls the entire AV signal processing unit 1047. Specific commands and control contents will be described later.

The decryption / authentication circuit 1603 performs an authentication process and a decryption process according to an instruction from the microprocessor 1610. This authentication process is a process for authenticating the data transmission device, and includes three steps of generating certification data, generating authentication data, and determining an authentication result. On the other hand, the decryption process is a process for decrypting the input encrypted digital data, and includes two steps of decryption key generation and decryption. These five steps are the same as those performed by the decryption / authentication circuit 1110 of the DVD-RAM drive 1910.

The decryption / authentication circuit 1603 performs a random number generation operation and an operation using the decryption function D (KEY, DATA) in the above-described decryption process and authentication process. This random number generation operation is the same as that of the DVD-ROM drive 1046, and the decryption function D (KEY, DATA) is
This is the inverse function of the encryption function E (KEY, DATA) performed by the encryption / authentication circuit 1510 of the drive 1046. Next, the operation of the AV signal processing unit 1047 when various commands are input will be described.

The AV signal processing unit 1047 includes a data receiving device certification command (PROOF_RECEIVER), a certification data acquisition command (GET_PROOF_INFO), a data transmission device authentication command (CHALLENGE_SENDER), a data transmission device confirmation command (CONFIRM_SENDER), and An AV data reproduction command (PLAY_AV) is received. The former 4 of these
Commands (PROOF_RECEIVER, GET_PROOF_INFO, CHAL
LENGE_SENDER, CONFIRM_SENDER) are commands for a series of authentication processes performed prior to the input of the AV data playback command (PLAY_AV), and are the same as in the case of the DVD-RAM drive 1910, and therefore description thereof is omitted.

<AV data playback command (PLAY_AV)
> The microprocessor 1610 determines that the command input to the I / O command status register 1602 is
If it is determined that the command is a V data playback command (PLAY_AV), the decryption / authentication circuit 1603 performed prior to the command is used.
If the authentication is not successful, no processing is performed on the input digital data.

On the other hand, if the authentication is successful, the transferred digital data is temporarily stored in the data buffer 604, and the encrypted digital data is decrypted by the decryption / authentication circuit 16.
03, and outputs the decoded digital data to the MPEG decoder 606 via the CGMS data detection / identification circuit 605. At this time, if the CGMS data detection / identification circuit 605 determines that the data is non-AV data, the microprocessor 1610 interrupts the digital data processing and ends. That is, the digital data is converted to MP
The transfer to the EG decoder 606 is interrupted.

On the other hand, the CGMS data detection / identification circuit 60
If the digital data is determined to be AV data by 5, the digital data is input to the MPEG decoder 606, subjected to a predetermined decompression process, and converted into video data and audio data.
The converted audio data is converted into an analog audio signal by the D / A conversion circuit 607, output to the accompanying speaker 47S, and output as audio. The converted video data is output to the video signal processing unit 48. [Control Unit 1049] The control unit 1049 further includes a processor bus 49B and a CPU 104, as shown in FIG.
9C, a bus I / F 49I and a main memory 49M. The CPU 1049C interprets an external instruction command received via the input unit 45 in accordance with the OS loaded in the main memory 49M and a control program specific to the information processing system, and reads digital data from the DVD-ROM 41. And control of its transmission destination.

This control unit 1049 apparently has the first
The same control as the control unit 49 of the embodiment is performed. That is, when receiving an instruction command to reproduce the AV data file of the DVD-ROM drive 1046 through the input unit 45, the control unit 1049 performs “AV data reproduction control” and copies the AV data file. When the instruction command is received, “AV data copy control” is performed and D
When a command to copy a file on the VD-ROM 41 is received, "data copy control" is performed.

However, different from the case of the first embodiment, the control section 1049 performs reproduction and copying as the center of control. In the “AV data reproduction control”, the control unit 1
Step 049 determines whether the specified file is a file storing AV data. This is because the directory name where the specified file is stored is DVD-Video.
It is determined by whether or not. As a result, when it is determined that the file is an AV data file, reproduction control of the AV data file is started. Specifically, DVD-ROM
An authentication process is performed between the drive 1046 and the AV signal processing unit 1047, and subsequently, the DVD-ROM drive 1046
And reads out the AV data file from the AV data file to the AV signal processing unit 1047 for reproduction. On the other hand, if it is determined that the file is a non-AV data file, an error is notified to the user by a beep sound or the like.

In the “AV data copy control”, the control unit 1
049 indicates that the specified file is A
It is determined whether the file is for storing V data. As a result, if it is determined that the file is an AV data file,
The copy control of the AV data file is started. Specifically, a DVD-ROM drive 1046 and a DVD-RAM
The authentication process between the drives 1910 is performed, and then the
An AV data file is read from the D-ROM drive 1046, and is written out to the DVD-RAM drive 1910 for recording. On the other hand, if it is determined that the file is a non-AV data file, an error is notified to the user by a beep sound or the like.

In the “data copy control”, the control unit 104
No. 9 determines whether the designated file stores AV data in the same manner as described above. As a result, non-AV
If it is determined that the file is a data file, the DVD-R
The non-AV data file is read from the OM drive 1046 and written to the HD device 44. On the other hand, if it is determined that the file is an AV data file, an error is notified to the user by a beep sound or the like as copyright protection processing. [List of Commands] The meanings of the above-mentioned commands are summarized in the table shown in FIG. That is, these commands are transmitted to the control unit 1 via the I / O bus 1042.
049 to other devices 44, 1046, 1910, 104
7 is a control command issued. (Operation of Information Processing System) Next, the operation of the information processing system configured as described above will be described with reference to a DVD-ROM.
Two cases in which the file recorded in the file 41 is copied to the DVD-RAM 99 and the file is reproduced will be described as examples. As described above, the DVD-RO
When the M41 is mounted on the DVD-ROM drive 1046, the file management information is transmitted to the control unit 104 as an initialization operation.
9 is stored in the main memory 49M. [Copy to DVD-RAM99] First, DVD-RO
The operation of the information processing system when the M41 AV data file is copied to the DVD-RAM 99 will be described.

FIG. 29 shows that the control unit 1049, DVD-ROM drive 1046 and D
FIG. 14 is a communication sequence diagram showing exchange of data and commands performed between VD-RAM drives 1910. This copy has three major operations: Phase R (Q
320 to Q328), phase S (Q329 to Q33)
6) and phase D (Q337 to Q340).

Phase R is for DVD-ROM drive 1
046 is a process for authenticating the DVD-RAM drive 1910 as an authorized data receiving device.
Means that the DVD-RAM drive 1910 is a DVD-ROM
Phase D is processing for transferring digital data from the DVD-ROM drive 1046 to the DVD-RAM drive 1910.

<Phase R> In the phase R, the control unit 1049 transmits a data receiving device authentication command (CHAL) to the DVD-ROM drive 1046 as the data transmitting device.
LENGE_RECEIVER) is output (Q320). The DVD-ROM drive 1046 that has received the data receiving device authentication command (CHALLENGE_RECEIVER) uses the encryption / authentication circuit 1510 to output the authentication data C1 (= E (S, R1 || R).
2)) is generated and returned to the control unit 1049 (Q321).

Control unit 10 receiving authentication data C1
49 is a data receiving device certification command (PROOF_RECEIV
ER) and the authentication data C1 to the DVD-RAM drive 1
910 (Q323 and Q324). The DVD-RAM drive 1910, which has received the data receiving device certification command (PROOF_RECEIVER), calculates the authentication data C1 input by the decryption / authentication circuit 1110 and obtains R2 to obtain the certification data K1.

Subsequently, the control unit 1049 outputs a certification data acquisition command (GET_PROOF_INFO) to the DVD-RAM drive 1910 (Q325).
The DVD-RAM drive 1910 returns the certification data K1 to the control unit 1049 (Q326). Proof data K1
The control unit 1049 having received the command outputs the data receiving device confirmation command (CONFIRM_RECEIVER) and the certification data K1 to the DVD-ROM drive 1046 (Q327).
And Q328). The DVD-ROM drive 1046 that has received the data receiving device confirmation command (CONFIRM_RECEIVER) determines the certification data K1 that was also input by the encryption / authentication circuit 1510, and the DVD-RAM drive 1910 that is the data receiving device. It determines whether the authentication of the client has succeeded and holds the authentication result internally. Specifically, the encryption / authentication circuit 1510 outputs the certification data K
It is determined whether 1 is equal to R2, and if they are equal, authentication that the data receiving device is a legitimate data receiving device is successful.

<Phase S> The control unit 1049 transmits the data transmission device authentication command (CHALLENGE_SENDER) to the DVD.
-Output to the RAM drive 1910 (Q329). This data receiver authentication command (CHALLENGE_SENDER)
The DVD-RAM drive 1910 that has received the authentication data C2 (= D (S, R)
3 || R4)) and returns it to the control unit 1049 (Q33).
0).

The control unit 10 receiving the authentication data C2
49 is a data transmission device certification command (PROOF_SENDE
R) and the authentication data C2 are stored in the DVD-ROM drive 1
046 (Q331 and Q332). The DVD-ROM drive 1046, which has received the data transmission device certification command (PROOF_SENDER), calculates the authentication data C2 input by the encryption / authentication circuit 1510 and obtains R4, which is used as the certification data K2.

Subsequently, the control unit 1049 outputs a certification data acquisition command (GET_PROOF_INFO) to the DVD-ROM drive 1046 (Q333).
The DVD-ROM drive 1046 returns the certification data K2 to the control unit (Q334). The control unit 1049 that has received the certification data K2 transmits the data transmission device confirmation command (CONFIRM_SENDER) together with the certification data K2 to the DVD-ROM.
Output to the RAM drive 1910 (Q335 and Q3
36). Data transmission device confirmation command (CONFIRM_SEND)
ER), the DVD-RAM drive 1910 receives
The decryption / authentication circuit 1 decrypts the certification data K2 that has been input together.
110, the DVD-ROM drive 1046
It determines whether or not the authentication has succeeded, and holds the authentication result internally. Specifically, the decryption / authentication circuit 1110
It is determined whether or not the proof data K2 is equal to R4, and if they are equal, it is determined that the data transmission device is a legitimate data transmission device, and authentication is successful.

<Phase D> The control unit 1049 operates the DVD
-Issue an AV data read command (READ_AV) to the ROM drive 1046 (Q337). AV
D issued data read command (READ_AV)
The VD-ROM drive 1046 is a DVD-ROM 41
Reads data from the specified address of the CGMS
The control data is stored in the CGMS control data memory 1302,
The user data is stored in the user data memory 1303, respectively. Then, whether or not the user data is AV data is determined based on the CGMS control data.

[0210] As a result, if it is AV data, by further referring to the authentication result held therein, the DV data can be obtained.
It is determined whether the D-RAM drive 1910 has been successfully authenticated as a legitimate data receiving device. As a result, if successful, the encryption / authentication circuit 1510 encrypts the user data (2048 bytes). If not successful, the user data replacement circuit 506 replaces the user data with NULL data.

Then, the DVD-ROM drive 1046
Outputs digital data (2054 bytes) consisting of CGMS control data (6 bytes) and encrypted user data (2048 bytes) or NULL data to the control unit 1049 as a data transfer unit (Q338). In addition,
The encryption key used in this encryption is data R1 || which is a combination of R1 which is a random number used when generating the authentication data C1 and R3 which is a random number constituting the authentication data received from the DVD-RAM drive 1910. R3.
Also, the encrypted AV data DATA is E (R1 || R3,
DATA).

Control unit 1049 that has obtained digital data E (R1 || R3, DATA) from DVD-ROM drive 1046
Outputs digital data to the DVD-RAM drive 1910 together with the AV data recording command (WRITE_AV) (Q339 and Q340). DVD-RAM drive 1910 receiving 2054 bytes of digital data
Stores the user data of the digital data in the user data memory 103 and the CGMS control data in the CGMS control data memory 102.

Then, the DVD-RAM drive 1910
Determines whether the user data is data for which copying is permitted, and whether the user data has been successfully authenticated in advance. As a result, if the authentication is successful and the user data is copy-permitted digital data, CGM
The S identification / update circuit 104 updates the CGMS control data. Then, the decryption / authentication circuit 1110 outputs the decryption key (R1 ||
R3), and use it to decrypt user data.
Thereafter, the data recording circuit 101 transmits the decrypted user data (D (R1 || R3, DATA)) and the CGMS that has just been updated.
The control data is recorded on the DVD-RAM 99.

On the other hand, if the authentication fails or the digital data is copy-prohibited, the user data replacement circuit 106 replaces the user data stored in the user data memory 103 with NULL data. Then, the data recording circuit 101 stores the NULL data and C
The GMS control data is recorded on the DVD-RAM 99. After repeating the above processing for the designated transfer length, the copying of the AV data file is completed. Next, the procedure of the above-described copying operation is shown in a flowchart.

FIG. 30 is a flowchart showing a processing procedure for copying the AV data file of the DVD-ROM 41 to the DVD-RAM 99. FIG. 31 is a flowchart showing a detailed procedure of the process HH of FIG. FIG.
2 is a flowchart showing a detailed procedure of the processing II in FIG. These three flowcharts respectively correspond to the flowcharts shown in FIGS. 12, 14 and 15 in the first embodiment. The differences from the first embodiment are as follows.

In this copy operation, control unit 104
9, the AV data file of the DVD-ROM 41 is copied to the DVD-RAM 99. Therefore,
The AV signal processing unit 47 does not intervene as in the first embodiment. DVD-ROM drive 1046 is DVD-R
Processing to authenticate AM drive 1910 (S1302)
Corresponds to phase R in FIG. 29, and uses encryption technology.

Similarly, the DVD-RAM drive 1910
Authenticates the DVD-ROM drive 1046 (S
1303) corresponds to phase S in FIG. 29, and uses an encryption technique. In the process HH, the encryption process (S
1325) has been added. That is, if the read digital data is copyable data and the authentication is successful, the DVD-RAM drive 191
Prior to transfer to 0, the digital data is encrypted.

Similarly, in the processing II, a decoding processing (S1335) is added. That is, if the input digital data is copyable data and the authentication is successful, the digital data is decrypted prior to recording on the DVD-RAM 99. [Reproduction] Next, the operation of the information processing system when the AV data file on the DVD-ROM 41 is reproduced will be described.

The exchange of data and commands between the control unit 1049, the DVD-ROM drive 1046, and the AV signal processing unit 1047 is almost the same as the communication sequence shown in FIG. That is, this is as shown in the communication sequence diagram in which the “DVD-RAM drive 1910” shown in FIG. 29 is replaced with the “AV signal processing unit 1047”.

This is because the AV signal processing unit 1047
This is because, like the D-RAM drive 1910, it is common in that it is a data receiving device that handles AV data. FIG.
3 is a flowchart showing a processing procedure for reproducing the AV data file on the DVD-ROM 41. FIG.
33 is a flowchart showing a detailed procedure of a process AA in FIG.

FIG. 35 is a flowchart showing a detailed procedure of the process BB of FIG. These three flowcharts respectively correspond to the flowcharts shown in FIGS. 19, 21 and 22 in the first embodiment. The differences from the first embodiment are as follows. In this reproducing operation, the DVD-ROM 41 and the AV signal processing unit 1047
The control unit 1049 is interposed therebetween. Therefore, as in the first embodiment, the two SCSI devices (the AV signal processing unit 47)
And a DVD-ROM drive 46).

The process of authenticating the AV signal processing unit 1047 by the DVD-ROM drive 1046 (S1102) corresponds to the phase R in FIG. 29, and uses an encryption technique. Similarly, if the AV signal processing unit 1047 is a DVD-ROM
The process of authenticating the drive 1046 (S1105) corresponds to phase S in FIG. 29, and uses an encryption technique.

In the process AA, the encryption process (S111
5) has been added. That is, if the read digital data is AV data and the authentication has succeeded, the digital data is encrypted prior to transfer to the AV signal processing unit 1047. Similarly, in the process BB, a decryption process (S1123) is added.
That is, the input digital data is AV data,
If the authentication is successful, the digital data is decrypted prior to the decoding process. [Summary] As described above, the data transmission device (DVD-ROM drive 104) of the information processing system according to the present invention
In 6), only when the digital data is determined to include the AV data and the data receiving device is authenticated as a legitimate data receiving device, the control unit controls the AV data to be encrypted and output. Have. Further, the data receiving apparatus (AV signal processing unit 1047) of the information processing system according to the present invention has a function of decoding digital data transmitted in an encrypted form and further converting the digital data into video data. And an authentication unit for generating and outputting authentication data indicating the following. Thus, the information processing system including the data transmitting device and the data receiving device according to the present invention can prohibit output to devices other than the authorized data receiving device that reproduces AV data.

For this reason, for some reason (for example, due to an error in the reproduction control program loaded into the control unit 1049), the AV data read command (READ_A
Even if the AV data read by V) is present in the main memory 128M of the control unit 1049 without being output to the AV signal processing unit 1047, the copyright of the AV data can be protected. The reason is that the data stored in the main memory 128M is encrypted, so that even if the data is secondarily recorded on a hard disk device or the like, it is impossible to reproduce or modify the data.

In the above encryption and decryption, an encryption key for encryption and a decryption key for decryption are generated based on different authentication data for each authentication. Thus, the transmitted AV data can be encrypted with a different encryption key for each authentication. For this reason, even when one encryption key is known, the encryption in the AV data transmission when the subsequent authentication timing is different can still be effective.

In the above-mentioned encryption and decryption, an encryption key for encryption and a decryption key for decryption are used for the first authentication data and data which are different for each authentication generated by the data transmitting apparatus. It is generated based on both of the second authentication data that is different for each authentication generated by the receiving device. Therefore, the AV data to be transmitted is encrypted only when both the data transmitting device and the data receiving device are valid.
Data can be decrypted, and AV data can be transmitted with higher security.

Hereinafter, the reason for the high security will be described.
This is performed by describing a malfunction that may occur when the encryption key is determined by only one device. It is assumed that an encryption key and a decryption key for encryption are generated only by the data receiving device. That is, in this case, the data receiving device
Before receiving the input of the encrypted AV data, an encryption key for generating the encrypted AV data is transmitted to the data transmitting device. Further, the data transmitting device encrypts and transmits the AV data with the transmitted encryption key, and the data receiving device receiving the input reproduces the AV data with the decryption key corresponding to the encryption key.

In this case, it is assumed that the encryption key transmitted by the data transmission device and the method of decrypting the data encrypted by the encryption key have been found even in one set. In this case, the unauthorized data receiving device created based on the decryption information transmits the decrypted encryption data to the legitimate data transmitting device, so that the AV data with the same encryption whose decryption method is always known can be transmitted. It is possible to cause a malfunction to be output.

However, as in the present invention, when the data transmitting device is involved in generating the encryption key and the decryption key in addition to the data receiving device, the encryption key is not determined only by the value output from the data receiving device. A malfunction that has occurred can be avoided. In the above determination, it can be determined whether or not the digital data stored on the information recording medium includes AV data, based on the data attribute flag stored in the header area of each sector. As a result, AV data can be finely protected for each sector.

Although the information processing system according to the second embodiment has been described, it goes without saying that the present invention is not limited to this embodiment. In this embodiment, the DV
Encryption / authentication circuit 151 of D-ROM drive 1046
0, the decryption / authentication circuit 1110 of the DVD-RAM drive 1910 and the decryption / authentication circuit 1603 of the AV signal processing unit 1047 each have a set of secret key S and an encryption function (or decryption function). Was used to generate authentication data, generate certification data, and encrypt (or decrypt) digital data, but the present invention is not limited to this. For example, different encryption functions can be used for generating authentication data, generating proof data, and encrypting (or decrypting) digital data. Thereby, security in the copyright protection processing is improved.

In the present embodiment, the encryption key is
After performing steps S and S, data transfer is performed in phase D. However, the present invention is not limited to this as long as the security of generating an encryption key as a result of one-sided authentication is acceptable.
That is, the phase D may be performed after performing only one of the phases R and S. Also,
In the protocol shown in FIG. 29, the control unit 1049 is interposed between the data transmitting device and the data receiving device in the phases R and S, but is not limited thereto. For example, a method may be used in which the data transmitting device and the data receiving device are connected by a dedicated signal line, and the data transmitting device and the data receiving device directly exchange authentication data.

In this embodiment, the I / O bus 1042
Is encrypted, but if a malfunction in which the AV data being transmitted is extracted can be tolerated, encryption and decryption accompanying the transfer of the AV data may be omitted. In this case, the effect of improving security by encryption cannot be obtained, but AV data can be protected with a simpler configuration.

In each of the above embodiments, the medium on which digital data including AV data is recorded is a DVD-RO.
M41, and the medium on which such digital data is recorded is the DVD-RAM 99. However, any digital data distribution medium or recording medium that can store the storage position of AV data in an identifiable manner. , DVD-RO
It is not limited to M or DVD-RAM. For example, it goes without saying that an information recording medium such as a magneto-optical disk having a similar sector structure may be used.

[0234] Further, if these media can identify the storage position of digital data including AV data,
It is not limited to an information recording medium such as an optical disk. For example,
It may be a wireless transmission medium such as a broadcast wave or a wired transmission medium such as a communication line. The transmission medium here is typically
It is defined as a physical layer of a communication protocol of Open Systems Interconnection (OSI) and guarantees transmission of digital data. For example, a telephone line, an Internet LAN, satellite broadcasting, and the like can be given. In this case, digital data transmitted by the transmission medium is transmitted after being divided into units called packets. The packet has a header section and a data section, and has the same configuration as the header section and the data section in the sector described in the above embodiment. Therefore, the present invention can be applied by providing an identification flag indicating whether the data stored in the data portion is AV data in the header portion of the packet. In this case, it is apparent that the data transmission device is a receiver device that receives information via a transmission medium instead of a disk drive.

Also, the present invention can be applied to digital satellite broadcasting using an MPEG transport stream. In this case, a plurality of MPEG streams are transmitted. In addition, a management information stream for transmitting information for managing the plurality of streams also exists in the plurality of streams. The present invention can also be implemented by storing and transmitting data attribute information indicating whether or not another stream is AV data and CGMS data in this management information stream.

Further, in both of the above embodiments, digital data compressed by MPEG2 is used as video data, but the present invention is not limited to this. For example, the MPEG4 system may be used. In addition, the DVD-R of both the above embodiments
The OM drives 46 and 1046 and the DVD-RAM drives 910 and 1910 are realized by hardware as shown in FIGS. 8, 9, 25, and 25. However, the present invention is not limited to this. Instead, it can be implemented in software. Specifically, FIGS. 12 to 22 and FIGS.
9 to 35 can be realized as a program including the steps shown in the flowcharts of FIGS.

The information recording medium storing the program can be distributed alone. When using the program, a general-purpose DV
By downloading to a D-ROM drive or DVD-RAM drive, it becomes possible to transform into a DVD-ROM drive or DVD-RAM drive according to the present invention.

In the above embodiments, the DVD-RAM
Drives 910 and 1910 are digital data DVDs.
-Only recording to RAM 99 was performed, but DVD-RAM
It goes without saying that reading from 99 is also performed. DV
The reading in the D-RAM drives 910 and 1910 is performed in the same procedure as the reading in the DVD-ROM drives 46 and 1046.

The video signal processing section 48 and the AV signal processing sections 47 and 1047 may be card-type devices which have connection sections for the I / O buses 42 and 1042 and are detachably mounted. Needless to say. In this case, the AV signal processing units 47 and 1047 generally correspond to what is called an AV signal processing card or an AV decoder card, and the video signal processing unit 48 corresponds to what is called a video card.

Although the video signal processing section 48 has a graphic generation function and a video composition function, these may be separated by providing the video composition function as a video composition section outside. In all of the above embodiments,
AV at the file system level performed by the control unit
Although the data file is identified based on whether the data file is stored in a directory called DVD-Video, the name of the directory storing AV data that can be defined by the naming convention is not limited to this. Also, the naming conventions for AV data files and non-AV data files are not limited to the above embodiment. For example, it goes without saying that the AV data file may be identified by separately defining a name rule of the AV data file, for example, by unifying the extension and detecting the extension.

The DVD-ROM drives 46, 10
Numeral 46 indicates NULL for user data as copyright protection processing.
The processing of replacing the data with the data is performed, but the present invention is not limited to such copyright protection processing. For example, N
An error code may be returned without outputting the UL data. Although the AV signal processing units 47 and 1047 are configured independently, any MPEG decoder that performs CGMS control may be used. For example, Discrete Cosine is provided in the control unit.
MPE with Transform (DCT) circuit and CGMS controller
An MPEG software decoder that realizes an AV signal processing unit using software or the like that performs soft decoding of G may be used.

In the first embodiment, the SCSI is used as the digital interface of the information processing system, and in the second embodiment, the ATAPI is used. However, if digital data, which is AV data, can be transmitted and a plurality of devices can be connected, this is used. It is not limited. For example, IEEE P
A digital interface defined in 1394 may be used.

[0243]

In order to achieve the above object, a data receiving apparatus according to the present invention comprises a digital data transmitted from a data transmitting apparatus via a transmission path (the digital data includes video data and its video And a use mode designating code for designating a data use mode), and recording the data on an external medium, and determining whether the data transmission apparatus is an authorized data transmission apparatus. Authentication means for performing authentication, reception means for receiving the digital data, and copy permission / non-permission judgment for judging whether or not recording of the digital data on the medium is permitted based on a use mode designation code in the received digital data Means, when the authentication is successful by the authentication means, and when it is determined that the copy permission / refusal means permits the digital data, Characterized in that it comprises a recording means for recording the body.

[0244] With this configuration, it is possible to prevent the illegal operation that the video data is illegally copied to the data receiving device such as the recording device outside the range of the use form designated by the copyright holder. Here, the usage mode designation code includes information indicating an upper limit of generations when copying of the video data is permitted, and the copy permission / non-permission determining unit determines whether the usage mode designation code indicates an upper limit of one or more generations. May be determined to be permitted.

As a result, it is possible to determine whether or not to permit copying only from the number of generations for which copying is permitted. Further, the recording unit may further include an updating unit that updates the usage pattern designation code such that the upper limit of the generation indicated by the usage pattern designation code is reduced by 1 prior to the recording.

As a result, illegal copying exceeding the limited number of generations is prevented. Further, when the authentication by the authentication unit fails or when the copy permission / refusal unit determines that the authentication is not permitted, the recording unit replaces the video data with meaningless data and then performs the recording. It may have a data replacement unit.

Thus, unauthorized use of the video data as it is is prevented. Further, the medium is an information recording medium, and the recording means records the video data in a user data area of the information recording medium, and records the use mode designation code in a header area corresponding to the user data area. Can also. Thus, the copyright holder can specify the usage mode of the video data in units of the user data area.

[0248] The authentication means may transmit authentication data generated based on a random number to the data receiving apparatus, and attempt the authentication using proof data returned in response to the authentication data. This eliminates eavesdropping-based fraud that can occur due to authentication using the same data.

[0249] The video data may be encrypted, and the recording means may include a decoding unit for decoding the video data prior to the recording. This prevents extraction of video data based on improper operation or malfunction during video data transfer. Further, the decryption unit may generate a decryption key based on the authentication data, and decrypt the video data using the decryption key.

As a result, authentication and decryption are associated with each other, and stronger copy guard is realized. In order to achieve the above object, a data transmitting apparatus according to the present invention includes a digital data extracted from an external medium (the digital data includes user data and a usage mode for designating a usage mode of the user data). And a data extracting unit for extracting digital data from the medium, and user data in the extracted digital data being an image. A data type determining unit that determines whether the data is data, and a normal type that the data receiving device processes the video data in a use mode specified by the use mode specifying code when the data type is determined to be video data. An authentication unit that attempts to authenticate whether or not the device is a data receiving device; and, if authentication is successful by the authentication unit, the transmission path. Through it, characterized in that it comprises a transmitting means for transmitting the digital data to the data receiving apparatus.

Thus, the A recorded on the information recording medium
It is possible to ensure that the V data is processed only in the usage form specified by the copyright holder. Here, the usage mode designation code includes information on permission of reproduction and copying of the video data, and the authentication unit determines whether the usage mode designation code indicates that only reproduction is permitted. Authenticates with a regular data receiving device when the data receiving device performs only reproduction, and validates when the data receiving device records video data when the usage pattern designation code indicates that copying is permitted. Can be authenticated with the data receiving device.

[0252] This prevents illegal or erroneous operation in which video data is transferred from a data transmitting device to a device that does not handle video data. Further, the usage mode designation code includes information indicating an upper limit of a generation when copying of the video data is permitted, and the authentication unit is configured to transmit the video data when the data receiving apparatus records video data. When the usage mode designation code indicates an upper limit of one or more generations, the data receiving device may be authenticated as a legitimate data receiving device.

As a result, it is possible to determine whether or not to permit copying only from the number of generations for which copying is permitted. Further, the transmission means may further include a transmission data replacement unit for transmitting the digital data after replacing the video data with meaningless data when the authentication by the authentication means has failed.

Thus, unauthorized use of the video data as it is is prevented. Further, the digital data may further include a data attribute code indicating an attribute of the user data, and the data type determination unit may make the determination based on a value of the data attribute code.

Thus, the video data is clearly distinguished from the non-video data, thereby preventing the video data from being illegally read from the information recording medium. The medium is an information recording medium in which the digital data is recorded in advance,
The data extracting means may extract the data attribute code and the use mode designation code from a header area corresponding to a user data area of the information recording medium.

Thus, the copyright holder can specify the use form of the video data in units of the user data area. Further, the authentication means may transmit authentication data generated based on a random number to the data receiving device, and attempt the authentication using proof data returned in response to the authentication data.

[0257] This eliminates eavesdropping-based fraud that can occur when performing authentication using the same data. Also,
The transmission means may include an encryption unit for encrypting user data in the digital data prior to the transmission. This prevents extraction of video data based on improper operation or malfunction during video data transfer.

[0258] The encryption unit may generate an encryption key based on the authentication data, and encrypt the user data using the encryption key. As a result, authentication and encryption are associated with each other, and stronger copy guard is realized. In order to achieve the above object, the present invention can also be an information processing system having both the data transmitting device and the data receiving device.

The procedure for copy guard in the data receiving apparatus can be realized as a program. As described above, according to the present invention, the copyright of the application copyright holder is reliably protected, so that a large number of applications are promoted to be distributed to the market at an appropriate price, thereby securing the interests of general users. Is done.

[Brief description of the drawings]

FIG. 1 is an external view of an information processing system according to a first embodiment.

FIG. 2 is a functional block diagram showing a configuration of the information processing system.

FIG. 3 shows a format of device attribute information. FIG.
(A) shows the entire format of data attribute information exchanged between SCSI devices. FIG. 3B shows the correspondence between the device type code included in the data attribute information and the device type indicated by the device type code.

FIG. 4A is a front view of a DVD. FIG.
(B) is a sectional view of the DVD.

FIGS. 5A to 5F are diagrams showing a physical structure of recording data called a DVD physical format. FIG. 5A shows a DVD data recording area 2206.
FIG. 3 is a diagram showing a physical structure of the device. FIG. 5B is a diagram showing the structure of one sector. FIG. 5C is a diagram showing a structure of CGMS control data composed of 6 bytes. FIG. 5D illustrates the meaning of the data attribute code. FIG. 5E is a diagram showing the structure of the CGMS data. FIG. 5F illustrates the meaning of the CGMS code.

FIGS. 6A and 6B are diagrams showing a logical structure of recording data called a logical format of a DVD. FIG. 6A shows a DVD data recording area 2206.
FIG. 3 is a diagram showing a logical structure of FIG. FIG. 6B is a tree diagram showing a file / directory structure.

FIGS. 7A to 7C are diagrams for explaining the ISO13346 standard used as a file system of the logical format shown in FIGS. 6A and 6B. It is. FIG. 7A is a diagram showing a logical relationship between data in file management information according to the ISO13346 standard. FIG. 7B is a diagram showing the structure of a file identification descriptor for a directory. FIG. 7 (c)
FIG. 4 is a diagram showing the structure of a file identification descriptor for a file.

FIG. 8 is a block diagram showing an internal configuration of the DVD-ROM drive 46.

FIG. 9 is a block diagram showing an internal configuration of a DVD-RAM drive 910.

FIG. 10 is a block diagram showing an internal configuration of an AV signal processing unit 47.

FIG. 11A shows a list of I / O commands. FIG. 11B shows a list of SCSI commands.

FIG. 12 is a flowchart showing a processing procedure for copying an AV data file of a DVD-ROM 41 to a DVD-RAM 99.

FIG. 13 is a communication sequence diagram showing communication exchanges in copying in FIG.

FIG. 14 is a flowchart illustrating a detailed procedure of a process H of FIG. 12;

FIG. 15 is a flowchart showing a detailed procedure of a process I of FIG. 12;

FIG. 16 shows a case where the data file of the DVD-ROM 41 is HD
9 is a flowchart showing a procedure copied to the device 44.

17 (a) and 17 (b) are communication sequence diagrams showing communication exchanges in the copy in FIG. 16; FIG. 17A shows that the data file file in FIG. 16 is a non-AV data file,
The data read from the ROM drive 46 is non-AV
FIG. 9 is a communication sequence diagram showing exchange of communication in the case of data. FIG. 17B shows that the data file file in FIG. 16 is a non-AV data file,
FIG. 9 is a communication sequence diagram showing communication exchange when data read from a ROM drive is AV data.

FIG. 18 is a flowchart showing a detailed processing procedure of a processing C in FIG. 16;

FIG. 19 is a flowchart showing a processing procedure for reproducing an AV data file on the DVD-ROM 41.

20 is a communication sequence diagram showing communication exchange in reproduction in FIG. 19;

FIG. 21 is a flowchart showing a detailed procedure of a process A of FIG. 19;

FIG. 22 is a flowchart illustrating a detailed procedure of a process B in FIG. 19;

FIG. 23 is an external view of an information processing system according to a second embodiment.

FIG. 24 is a functional block diagram showing a configuration of the information processing system.

FIG. 25 is a block diagram showing the internal configuration of a DVD-ROM drive 1046.

FIG. 26 is a block diagram showing the internal configuration of a DVD-RAM drive 1910.

FIG. 27 is a block diagram showing an internal configuration of an AV signal processing unit 1047.

FIG. 28 shows a list of commands exchanged between devices.

FIG. 29 is a communication sequence diagram showing communication exchange when an AV data file of the DVD-ROM 41 is copied to the DVD-RAM 99.

FIG. 30 is a flowchart showing a processing procedure in the copy of FIG. 29;

FIG. 31 is a flowchart showing a detailed procedure of a process HH of FIG. 30;

FIG. 32 is a flowchart showing a detailed procedure of processing II of FIG. 30;

FIG. 33 is a flowchart showing a processing procedure for reproducing an AV data file on the DVD-ROM 41.

FIG. 34 is a flowchart showing a detailed procedure of processing AA in FIG. 33;

FIG. 35 is a flowchart showing a detailed procedure of a process BB of FIG. 33;

FIG. 36 is a block diagram showing a configuration of a conventional personal computer with a CD-ROM drive.

FIG. 37 is a front view of a display device 2407D.

[Explanation of symbols]

Reference Signs List 40 information processing device 41 DVD-ROM 42, 1042 I / O bus 43 SCSI bus 44 HD device 45 input unit 46, 1046 DVD-ROM drive 47, 1047 AV signal processing unit 48 video signal processing unit 49, 1049 control unit 50 SCSI Device group 99 DVD-RAM 100, 500 Interface connector 101 Data recording circuit 102, 502 CGMS control data memory 103, 503 User data memory 104 CGMS data identification / update circuit 105, 505 SCSI bus control circuit 106, 506 User data replacement Circuits 107, 507 Internal data bus 108, 508 Control bus 109, 509, 1109, 1509 Microprocessor 501 Data readout circuit 504 CGMS data identification circuit 1100 1500 connector 910,1910 DVD-RAM drive 1105,1505 interface control circuit 1110 decoding and authentication circuit 1510 encryption and authentication circuit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical indication H04N 5/91 H04N 5/91 P 5/92 5/92 H (72) Inventor Nohisa Fukushima Osaka 1006 Kadoma, Kadoma Matsushita Electric Industrial Co., Ltd. (72) Inventor Koichiro Endo 1006 Kadoma, Kadoma, Osaka Prefecture Within Sangyo Co., Ltd. (72) Inventor Shunji Harada 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (23)

[Claims] 1. A data receiving apparatus for receiving digital data transmitted from a data transmitting apparatus via a transmission path and recording the digital data on an external medium, wherein the digital data includes video data and An authentication unit that attempts to authenticate whether or not the data transmission device is a legitimate data transmission device; a reception unit that receives the digital data; Copy permission / non-permission determining means for determining whether or not recording of the digital data on the medium is permitted based on the usage pattern designating code in the obtained digital data; Recording means for recording the digital data on the medium when it is determined that the data is permitted by the data receiving apparatus. Apparatus. 2. The use mode designation code includes information indicating an upper limit of a generation when copying of the video data is permitted, and the copy permission / refusal determination unit determines that the use mode designation code is one generation or more. 2. The data receiving apparatus according to claim 1, wherein when the upper limit is indicated, it is determined that the permission is granted. 3. The recording device according to claim 1, wherein the upper limit of the generation indicated by the use mode designation code is 1 prior to the recording.
3. The data receiving apparatus according to claim 2, further comprising an updating unit that updates the use mode designation code so as to decrease the usage mode designation code. 4. The recording means further comprising: replacing the video data with meaningless data if the authentication by the authentication means has failed or if the copy permission / refusal means determines that the image data is not permitted. 4. The data receiving apparatus according to claim 3, further comprising a received data replacing unit for performing the recording. 5. The medium is an information recording medium, wherein the recording means records the video data in a user data area of the information recording medium, and stores the use mode designation code in a header area corresponding to the user data area. 5. The data receiving apparatus according to claim 4, wherein the data is recorded. 6. The authentication unit transmits authentication data generated based on a random number to the data transmission device, and attempts the authentication using proof data returned in response to the authentication data. The data receiving device according to claim 5. 7. The apparatus according to claim 6, wherein said video data is encrypted, and said recording means includes a decryption unit for decrypting said video data prior to said recording.
The data receiving device according to the above. 8. The data receiving apparatus according to claim 7, wherein the decryption unit generates a decryption key based on the authentication data, and decrypts the video data using the decryption key. 9. A data transmitting apparatus for transmitting digital data extracted from an external medium to a data receiving apparatus via a transmission path, wherein the digital data specifies user data and a use form of the user data. Data extracting means for extracting digital data from the medium; data type determining means for determining whether user data in the extracted digital data is video data; If it is determined that the data is data, an authentication unit that attempts to authenticate whether the data receiving device is a legitimate data receiving device that processes the video data in a use mode specified by the use mode specifying code. And when the authentication by the authentication means is successful, the digital data is transmitted to the data receiving device via the transmission path. Data transmission apparatus comprising: a transmitting means signals for. 10. The use mode designating code includes information on permission of reproduction and copying of the video data. The authentication unit, when the use form designating code indicates that only reproduction is permitted, If the data receiving device performs only reproduction, the data receiving device authenticates with a legitimate data receiving device, and if the usage pattern designation code indicates that copying is permitted, the data receiving device records video data. 10. The data transmitting apparatus according to claim 9, wherein if the authentication is performed, the authentication is performed with the authorized data receiving apparatus. 11. The usage mode designation code includes information indicating an upper limit of a generation when copying of the video data is permitted, and the authentication unit records the video data in the data receiving device. 11. The data transmission device according to claim 10, wherein in some cases, when the usage mode designation code indicates an upper limit of one or more generations, the data reception device is authenticated as a proper data reception device. 12. The transmission means further comprising a transmission data replacement unit for transmitting the digital data after replacing the video data with meaningless data when the authentication by the authentication means has failed. Claim 1
2. The data transmission device according to 1. 13. The digital data further includes a data attribute code indicating an attribute of the user data, wherein the data type determination unit performs the determination based on a value of the data attribute code. Item 13. The data transmission device according to item 12. 14. The medium is an information recording medium on which the digital data has been recorded in advance, and the data extracting means reads the information from a header area corresponding to a user data area of the information recording medium on which the user data is stored. 14. The data transmitting apparatus according to claim 13, wherein the data transmitting apparatus extracts a data attribute code and a usage mode designation code. 15. The authentication unit transmits authentication data generated based on a random number to the data receiving device,
15. The data transmitting apparatus according to claim 14, wherein the authentication is attempted using the certification data returned thereto. 16. The transmission means, prior to the transmission,
The data transmission device according to claim 15, further comprising an encryption unit that encrypts user data in the digital data. 17. The data transmission device according to claim 16, wherein the encryption unit generates an encryption key based on the authentication data, and encrypts the user data using the encryption key. 18. An information processing system for copying digital data including video data, comprising: a transmission path; a data transmission apparatus according to claim 9 connected to the transmission path; 2. The data receiving apparatus according to claim 1, wherein the data transmitting apparatus extracts digital data from the medium and transfers the digital data to the data receiving apparatus via the transmission path according to an instruction from an operator. Receives the digital data and records it on the medium,
An information processing system comprising a control device for controlling the data transmitting device and the data receiving device as described above. 19. When the user data in the inputted digital data is video data, the information processing system further converts the video data into a video signal and an audio signal, and performs graphic display and A playback device that outputs audio; the control device further includes: the data transmission device extracts digital data from the medium and transfers the digital data to the playback device via the transmission path according to an instruction from an operator; 20. The information processing system according to claim 18, wherein the data transmission device and the reproduction device are controlled so that the device performs the graphic display and the audio output. 20. The video data, wherein a horizontal resolution is 45.
20. The information processing system according to claim 19, wherein inter-frame compression is applied to zero or more video data. 21. A method for receiving digital data transmitted from a data transmission device via a transmission path and recording the digital data on an external medium, wherein the digital data includes video data and a usage form of the video data. An authentication step of attempting to authenticate whether the data transmission device is a legitimate data transmission device, a reception step of receiving the digital data, and a received digital signal. A copy permission / refusal determination step of determining whether or not recording of the digital data on the medium is permitted based on a use form designating code in the data; Recording the digital data on the medium when it is determined that the digital data has been recorded. Data receiving method for. 22. The usage mode designation code includes information indicating an upper limit of generations when copying of the video data is permitted, and the copy permission / denial determination step includes determining that the usage mode designation code is one generation or more. If the upper limit is indicated, it is determined that the permission is granted, and the recording step further includes, prior to the recording, the usage mode designation code such that the upper limit of the generation indicated by the usage mode designation code is reduced by one. Updating the video data, if the authentication in the authentication step has failed, or if the copy permission / refusal step determines that the image data is not authorized, the recording is performed after replacing the video data with meaningless data. 22. The data receiving method according to claim 21, further comprising: 23. The authentication step includes transmitting authentication data generated based on a random number to the data transmission device, and attempting the authentication using proof data returned thereto, wherein the video data is Being encrypted, the recording step further includes, prior to the recording, a decryption step of generating a decryption key based on the authentication data and decrypting the video data using the decryption key. The data receiving method according to claim 22, wherein: