JP2000306331A - Content information recording method, content information processing apparatus, and backup medium - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent transfer of a medium on which content data is recorded between users while preventing unauthorized copying. SOLUTION: When transferring encrypted content information EG1 (X1) from a medium A to a medium B, encryption key information EA (G1) is transferred.
1) and the ID (A) of the medium A are recorded in the memory of the media controller as the management number Dn of the data link ID. E
Dn is added to G1 (X1) and copied to medium B together with EA (G1). The EA (G1) read from the medium B is compared with the EA (G1) read from the memory, and if they match, a difference ID that is a difference value between the IDs of the media B and the media A
(AB) Output the value to media B. After output, EA (G1) and ID (A) recorded in the memory are deleted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to encrypted content information encrypted with a predetermined content key, and encrypted key information obtained by encrypting the content key used for the content key with the media ID as an ID key. And a content information encryption system for recording and reproducing. The present invention is intended to distribute content information (especially audio and video data) and to safely transfer (move) data between users' media while preventing unauthorized distribution of the distributed data. It is an object of the present invention to provide a content information recording method, a content information processing device, and a backup medium in a content information encryption system that can be used.

[0002]

2. Description of the Related Art With the development of encryption technology, as a useful method of distributing audio and video digital data using a network, a digital content distribution management method disclosed in Japanese Patent Application Laid-Open No. 10-269289, There are reproduction methods and devices. In the present invention, the digital content distribution side processes the digital content by encrypting and compressing it, and processes the digital content and the encrypted content key,
Further, the encrypted billing information is transmitted to the communication partner, and the usage fee collected based on the content usage information transmitted from the communication partner is distributed to the right holder. On the other hand, on the digital content reproducing side, the processed digital content is decrypted with the content key and decompressed and reproduced, and at the same time, the billing information is reduced and the usage information is transmitted to the distribution side according to the use of the content. So that the recorded content can be carried around. Further, there are an information recording medium, a recording device, an information transmission system, and a decryption device described in JP-A-9-25303. The information recording medium of the present invention comprises:
In the case where the encrypted encryption information and the encryption key information obtained by encrypting the key information for decrypting the encrypted information into the original information are recorded, the encryption key information ,
Condition information for decrypting the encrypted information in an unencrypted state is recorded. That is, since the device information and the area information are included in the control information of the encryption key information, the information encrypted by the user is directly copied to the HDD or the optical disk to prevent unauthorized use.

[0003]

However, in the above-mentioned conventional system, the medium on which the content data is recorded cannot be transferred between users (the medium itself can be transferred even if the medium itself can be transferred). Since the content data cannot be properly reproduced, the user must always connect to a charging management institution, a data management center, or the like in order to obtain the content data. In addition, if one user has multiple media, it is possible to move data between the media or make a temporary backup, and then return the data to any media while preventing unauthorized copying. Can not. The present invention provides content information in a content information encryption system that can safely transfer (move) data between users' media while distributing content information and preventing unauthorized copying of the distributed data. It is an object to provide a recording method, a content information processing device, and a backup medium.

[0004]

Accordingly, in order to solve the above-mentioned problems, the present invention provides the following method and apparatus. (1) Encrypted content information encrypted with a predetermined content key and an encryption key obtained by encrypting the content key using information on a media ID of a first medium on which the encrypted content information is recorded as an ID key A content information recording method for recording the encrypted content information and the encryption key information on a second medium from the first medium on which information has been recorded, the information relating to a media ID of the first medium. Is temporarily recorded in a predetermined memory other than the first and second media, and the encrypted content information and the encryption key information are recorded on the backup medium from the first medium, and the first Erasing the encryption key information from the media of
The encrypted content information and the encryption key information are recorded on the second medium from the backup medium, and information on the media ID of the second medium and the first medium temporarily recorded in the memory are recorded. Content information, wherein unique ID information formed from the information on the media ID of the first medium is recorded on the second medium, and the information on the media ID of the first medium temporarily recorded is deleted from the memory. Recording method. (2) An encryption key obtained by encrypting the content key using the encrypted content information encrypted with a predetermined content key and the media ID of the first medium on which the encrypted content information is recorded as an ID key. A content information recording method for recording the encrypted content information and the encryption key information on a second medium from the first medium on which information has been recorded, the information relating to a media ID of the first medium. Is temporarily recorded in a predetermined memory other than the first and second media in a form associated with the data link ID, and the encrypted content information, the encryption key information, and the data link ID are stored in a backup medium. At the same time, erase the encryption key information from the first medium, and thereafter, To record the encrypted content information, the encryption key information, and the data link ID on the second medium, and temporarily record the information on the memory based on the data link ID read from the second medium. Information about the media ID of the first medium thus obtained, and the unique ID information formed from the information about the media ID of the first medium and the information about the media ID of the second medium. A content information recording method, wherein the information about the media ID of the temporarily recorded first medium is erased from the memory. (3) An encryption key obtained by encrypting the content key using an encrypted content information encrypted with a predetermined content key and information on a media ID of a first medium on which the encrypted content information is recorded as an ID key. A content information recording method for recording the encrypted content information and the encryption key information on a second medium from the first medium on which information has been recorded, the information relating to a media ID of the first medium. And the encryption key information are temporarily recorded in a predetermined memory other than the first and second media in a form associated with the data link ID, and the encrypted content information, the encryption key information, and the data The link ID is recorded on a backup medium, and the encryption key information is deleted from the first medium. And recording the encrypted content information, the encryption key information, and the data link ID from a backup medium on the second medium, and based on the data link ID read from the second medium. Information about the media ID of the first medium and the encryption key information temporarily recorded in the storage medium, and the encryption key information read from the second medium and the encryption key information read from the memory are obtained. Collate,
Only when the two pieces of encryption key information have a single value, unique ID information formed from information on the media ID of the second medium and information on the media ID of the first medium read from the memory A content information recording method, wherein the information about the media ID of the first medium and the encryption key information which have been temporarily recorded are erased from the memory. (4) The information about the media ID of the first medium temporarily recorded in the memory is information based on the media ID of the first medium read from the first medium, and the information of the second medium is The content according to any one of (1) to (3), wherein the information on the media ID is information based on the media ID of the second medium read from the second medium. Information recording method. (5) The above (1) to (4), wherein the unique ID information is difference ID information which is a difference value between a media ID of the first medium and a media ID of the second medium. The content information recording method according to any one of the above. (6) The predetermined content key is a common key or a public key, and the ID key is information obtained by converting a common key using a media ID of the first medium or a media ID of the first medium by a predetermined function. The content information recording method according to any one of the above (1) to (5), wherein the content information recording method is a common key using (7) An encryption key obtained by encrypting the content key using an encrypted content information encrypted with a predetermined content key and information on a media ID of a first medium on which the encrypted content information is recorded as an ID key. When recording the encrypted content information and the encryption key information on the second medium from the first medium on which information is recorded via a backup medium,
A content information processing apparatus for processing information about D, wherein the memory temporarily stores information about the media ID of the first medium, the information about the media ID of the second medium, and the information temporarily stored in the memory. 1
Unique ID from information on media ID of media
Forming the encrypted content information and the encryption key information from the backup medium to the second
A unique ID information forming unit that records the unique ID information on the second medium after the unique ID information is recorded on the medium, and a medium ID of the first medium that is temporarily recorded from the memory after the unique ID information is formed. A content information processing apparatus, comprising: erasing means for erasing information. (8) Encrypted content information encrypted with a predetermined content key and an encryption key obtained by encrypting the content key using information on a media ID of a first medium on which the encrypted content information is recorded as an ID key When recording the encrypted content information and the encryption key information on the second medium from the first medium on which information is recorded via a backup medium,
A content information processing apparatus for processing information relating to the first medium; a memory for temporarily recording information relating to a media ID of the first medium in a form associated with the data link ID; Data link ID writing means for recording on a medium;
After the encrypted content information, the encryption key information, and the data link ID are recorded from the backup medium to the second medium, based on the data link ID read from the second medium, Obtaining information about the medium ID of the first medium temporarily recorded in the memory, and obtaining the medium ID of the first medium;
ID information is formed from the information about the second medium and the information about the media ID of the second medium.
Unique ID information forming means for recording information on the second medium; and erasing means for erasing information about the medium ID of the first medium temporarily recorded from the memory after the formation of the unique ID information. A content information processing apparatus characterized by the following. (9) Encrypted content information encrypted with a predetermined content key, and an encryption key obtained by encrypting the content key using information on a media ID of a first medium on which the encrypted content information is recorded as an ID key When recording the encrypted content information and the encryption key information on the second medium from the first medium on which information is recorded via a backup medium,
A content information processing apparatus for processing information related to the first medium; a memory for temporarily recording information related to a media ID of the first medium and the encryption key information in a form associated with a data link ID; A data link ID writing unit that records a link ID on the first medium; and the encrypted content information, the encryption key information, and the data link ID are recorded on the second medium from the backup medium. Later, based on the data link ID read from the second medium, the first temporarily recorded first data from the memory is read.
Memory reading means for reading information on the media ID of the medium and the encryption key information; the encryption key information read from the second medium; and the encryption key read from the memory by the memory reading means. Encryption key information matching means for matching information with the medium ID of the second medium only when the encryption key information matching means determines that the two pieces of encryption key information have a single value. Unique ID information forming means for forming unique ID information from the information and the information on the media ID of the first medium read from the memory, and recording the unique ID information on the second medium; After the formation, the information about the media ID of the first medium and the encryption key information that are temporarily recorded are erased from the memory. Content information processing apparatus is characterized by providing an erasing means. (10) The information about the media ID of the first medium temporarily recorded in the memory is information based on the media ID of the first medium read from the first medium, and the information of the second medium is The content according to any one of (7) to (9), wherein the information on the media ID is information based on the media ID of the second medium read from the second medium. Information processing device. (11) The above (7) to (10), wherein the unique ID information is difference ID information which is a difference value between a media ID of the first medium and a media ID of the second medium. A content information processing apparatus according to any one of the above. (12) The predetermined content key is a common key or a public key, and the ID key is a medium ID of the first medium.
The content according to any one of the above (7) to (11), wherein the content is a common key using a common key or information obtained by converting the media ID of the first medium by a predetermined function. Information processing device. (13) Encrypted content information encrypted with a predetermined content key, encryption key information obtained by encrypting the content key using information on the media ID of another medium as an ID key, and media ID of the other medium And a data link ID which is link destination information to information on the backup. (14) The predetermined content key is a common key or a public key, and the ID key is a medium I of the other medium.
D using the common key or the medium I of the other medium
The backup medium according to the above (13), which is a common key using information obtained by converting D by a predetermined function.

[0005]

According to the present invention, it is possible to transfer a medium on which content data is recorded between users while preventing unauthorized copying, and it is not always necessary to connect to a billing management organization, a data management center, etc. It enables users to obtain content data without having to do so.
Further, according to the present invention, when one user has a plurality of media, the data is moved between the media or temporarily backed up, and then, while preventing unauthorized copying, the data can be transferred to any media. A system for restoring data can be provided.

[0006] In the present invention, [a] the encrypted content information encrypted with a predetermined content key and information on the media ID of a first medium on which the encrypted content information is recorded are used as the ID key as the content key. When the content information for recording the encrypted content information and the encryption key information on the second medium is recorded from the first medium on which the encryption key information obtained by encrypting the Information about the media ID of the medium is temporarily recorded in a predetermined memory other than the first and second media, and the encrypted content information and the encryption key information are recorded on the second medium; The encryption key information is erased from the first medium, and information on the medium ID of the second medium and the first temporarily stored in the memory are stored. Unique ID formed from information on media ID of media
Recording information on the second medium and storing the medium I of the temporarily recorded first medium from the memory;
Information about D was deleted. [B] an encryption key obtained by encrypting the content key by using the encrypted content information encrypted with a predetermined content key and the media ID of the first medium on which the encrypted content information is recorded as an ID key In the case of content information recording in which the encrypted content information and the encryption key information are recorded on a second medium from the first medium on which information is recorded, information on a media ID of the first medium is used as data. The encrypted content information, the encryption key information, and the data link ID are temporarily recorded in a predetermined memory other than the first and second media in a form associated with the link ID. And erases the encryption key information from the first medium and reads the data read from the second medium. Information about the media ID of the first medium temporarily recorded in the memory based on the link ID, and forming the information from the information about the media ID of the first medium and the information about the media ID of the second medium. The unique ID information is recorded on the second medium, and the temporarily recorded first ID is recorded from the memory.
Information about the media ID of the media No. is deleted. [C] an encryption key obtained by encrypting the content key using an encrypted content information encrypted with a predetermined content key and information on a media ID of a first medium on which the encrypted content information is recorded as an ID key. When the encrypted content information and the encryption key information are recorded on the second medium from the first medium on which information is recorded, information on the media ID of the first medium and the encryption key The information is temporarily recorded in a predetermined memory other than the first and second media in a form associated with the data link ID, and the encrypted content information, the encryption key information, and the data link ID are stored in the memory. Second
Of the first medium temporarily erased in the memory based on the data link ID read from the second medium while erasing the encryption key information from the first medium. Information about a media ID and the encryption key information are obtained, the encryption key information read from the second medium is compared with the encryption key information read from the memory, and the two encryption key information are compared. Is unique, the unique ID information formed from the information on the media ID of the second medium and the information on the media ID of the first medium read from the memory is stored in the second medium. Recording, and erasing, from the memory, the information about the media ID of the first medium and the encryption key information which are temporarily recorded. .

[D] The content key is encrypted using an encrypted content information encrypted with a predetermined content key and information on a media ID of a first medium on which the encrypted content information is recorded as an ID key. When recording the encrypted content information and the encryption key information on the second medium from the first medium on which the encryption key information is recorded, the medium ID of the first medium
Information about the encrypted content information and the encryption key information from the first medium to a backup medium while temporarily recording information about the encrypted content in a predetermined memory other than the first and second media. Erasing the encryption key information from the first medium, and then recording the encrypted content information and the encryption key information from the backup medium on the second medium;
Information about the media ID of the second media and the media ID of the first media temporarily recorded in the memory
The unique ID information formed from the
And the information about the medium ID of the temporarily recorded first medium is erased from the memory. [E] Encrypted content information encrypted with a predetermined content key and an encryption key obtained by encrypting the content key using information on a media ID of a first medium on which the encrypted content information is recorded as an ID key When the encrypted content information and the encryption key information are recorded on the second medium from the first medium on which the information is recorded, information on the media ID of the first medium is represented by a data link ID. While temporarily recording in a predetermined memory other than the first and second media in an associated form, and recording the encrypted content information, the encryption key information, and the data link ID on a backup medium, Erasing the encryption key information from the first medium, and then encrypting the encrypted content from the backup medium. The information, the encryption key information, and the data link ID are recorded on the second medium, and the first data temporarily recorded in the memory is recorded based on the data link ID read from the second medium. Obtaining information about the media ID of the medium, and forming a unique I formed from the information about the media ID of the first medium and the information about the media ID of the second medium.
The D information is recorded on the second medium, and the information on the temporarily recorded medium ID of the first medium is deleted from the memory. [F] An encryption key obtained by encrypting the content key using an encrypted content information encrypted with a predetermined content key and information on a media ID of a first medium on which the encrypted content information is recorded as an ID key. When the encrypted content information and the encryption key information are recorded on the second medium from the first medium on which information is recorded, information on the media ID of the first medium and the encryption key Information is temporarily recorded in a predetermined memory other than the first and second media in a form associated with the data link ID, and the encrypted content information, the encryption key information, and the data link ID are backed up. Recording on the backup medium and erasing the encryption key information from the first medium. The encrypted content information, the encryption key information, and the data link ID are recorded on the second medium, and are temporarily recorded in the memory based on the data link ID read from the second medium. Obtaining information about the media ID of the first medium and the encryption key information, collating the encryption key information read from the second medium with the encryption key information read from the memory, Only when two pieces of encryption key information have a single value, information on the media ID of the second medium and the first information read from the memory.
The unique ID information formed from the information about the media ID of the medium is recorded on the second medium, and the information about the media ID of the first medium temporarily recorded from the memory, the encryption key information, Was deleted.

[G] The information about the medium ID of the first medium temporarily recorded in the memory is the medium ID of the first medium read from the first medium.
Based on the media I of the second media
The information relating to D is information based on the media ID of the second medium read from the second medium. [H] The unique ID information is difference ID information that is a difference value between the media ID of the first medium and the media ID of the second medium. [I] The predetermined content key is a common key or a public key, and the ID key is information obtained by converting a common key using a medium ID of the first medium or a medium ID of the first medium by a predetermined function. It was made to be a common key using.

[J] Encrypted content information encrypted with a predetermined content key and a media ID of another medium
Key information obtained by encrypting the content key by using information about the content key as an ID key, and the media ID of the other medium
When restoring content information from a medium on which unique ID information formed from information related to the medium ID of the present medium and information related to the medium ID of the present medium is recorded, the other medium is reconstructed from the unique ID information and the medium ID of the present medium. , The content key is restored from the encryption key information, and the encrypted content information is restored using the content key. [K] encrypted content information encrypted with a predetermined content key, encryption key information obtained by encrypting the content key using information on the media ID of another medium as an ID key, and media ID of the other medium And the unique ID information formed from the information on the media ID of the present medium and the media ID of the present medium. [L] The information on the media ID of the other medium for forming the unique ID information is information based on the media ID of the medium read from the other medium, and is used for forming the unique ID information. The information on the media ID of the main medium is information based on the medium ID of the medium read from the main medium. [M] The unique ID information is difference ID information that is a difference value between the medium ID of the other medium and the medium ID of the main medium. [N] the predetermined content key is a common key or a public key, and the ID key is a media ID of the other medium.
Key using ID or media ID of the other media
Is a common key using information converted by a predetermined function.

First, the configuration of an embodiment of the present invention will be described with reference to FIG. The media is set with an ID unique to the media, and can be set in the media controller. The medium may be a solid-state memory, a disk, a tape, or the like as long as the medium can be recorded and reproduced and a unique ID can be set.
However, the condition is that the ID information has a predetermined tamper resistance. That is, it is desirable that it is difficult to read or rewrite information illegally with respect to storage of IDs and keys required for encryption.

The simplest type is a memory type. This memory card has a structure in which an ID and encryption key information can be extracted only through a predetermined memory controller, but can be created safely and easily. The memory card has a unique ID recorded for each card during factory production. Alternatively, at the time of issuance by the issuing device, the ID unique to the memory is recorded in an EEPROM or the like, and then embedded in resin or the like. This allows
The key information corresponding to the user cannot be changed later, that is, it cannot be tampered with. The media has a media bus that can copy only some data between the media.

The media controller sets the media,
It is connected to a terminal such as a PC or a dedicated device, and has an interface function with the data in the media, the terminal, and a function of encrypting and decrypting data with a predetermined ID. The media controller has tamper resistance so that the terminal cannot illegally access the inside of the memory. The terminal is connected to a center (distribution center) for distributing content information located outside, and receives content data through a predetermined procedure such as charging and authentication. The connection to the center is not only a network such as the Internet, but also ISDN, broadcasting, cable T
A wireless connection such as V or PHS may be used.

The content information is basically encrypted with a different key (content key) for each content. Content is
After being compressed by a predetermined compression method such as MPEG, DES
And so on. For example, in the case of DES, the encryption key is about 64 bits. FIG. 1 shows the relationship between the database, the center, and the terminals. In the database installed at the center, the content information uses the content X1 as an encryption key
It is managed as encrypted with G1 and different content X2 is encrypted with encryption key G2.

A plurality of terminals are connected to this center via a network. The transmission to the terminal is also encrypted by the public key method for security and transmitted. Here terminal 1
Assuming that the public key of (T1) is T1P and the decryption key is T1D, the content X1 managed in the database 1 is the encryption key
The content is encrypted by G1 and becomes encrypted content information EG1 (X1). The encryption key G1 is transmitted to the terminal T1 for transmission to the terminal T1.
Is encrypted using the public key T1P of the
1P (G1). Then, the encrypted content information EG1 (X1)
And the encryption key information ET1P (G1).
Send to 1).

In order for the terminal 1 to reproduce this content information, the decryption key information Et1P (G1) is decrypted using the decryption key T1D of the terminal 1, and the encryption key G1 is obtained. Key G
The encrypted content information EG1 (X1) is decrypted in step 1, the content X1 is obtained, and the content can be played back by decrypting MPEG or the like.Here, the transmitted data is not played back by the terminal, It is assumed that recording is immediately performed on a medium connected to the terminal. Here, the data transmission to the terminal using the public key has been described, but the present invention can support the common key method or another method.

Next, with reference to FIGS. 3, 4, and 5, a function of transferring content information and key information according to an embodiment of the present invention will be described.

First, a case where content data is received from the distribution center to the medium A (first medium) on the terminal T1 side will be described. First, the medium A is set in the media controller. Set the media controller on the terminal T1,
Set to “Data recording mode”. Perform predetermined procedures such as billing and authentication. When the procedure is completed, the content data is encrypted with the predetermined encryption key G1 from the center and delivered to the terminal.

That is, encrypted content information EG1 (X1) obtained by encrypting the content X1 with the encryption key G1 is transmitted.
Further, in order to transmit the encryption key G1 to the terminal T1, encryption key information ET1P (G1) obtained by encrypting the encryption key G1 using the public key T1P of the terminal T1 is transmitted to the terminal T1. Since the key used for decryption at the terminal is T1D, this encryption key information ET1P (G1)
Can be decrypted with the decryption key T1D. This state is expressed as ET1D (G1). The terminal decrypts the encryption key information ET1D (G1) once with the decryption key T1D to obtain the encryption key G1.

The media controller receives this data,
On the medium A, the encrypted content information EG1 (X1) is recorded, and at the same time, the media controller sets the ID of the set medium.
, The key G1 is re-encrypted with the value A, which is a unique ID of the medium A, to obtain encryption key information EA (G1), which is recorded on the medium A. The contents of the medium A at this time are shown in a block of the medium A in FIG. α is a difference I described later.
D (unique ID information), and at this time, α = 0 is recorded. FIG. 4A shows the data structure immediately after distribution. The data is headed by 64 bits of differential ID, encryption key information 6
4 bits, after which the encrypted content information is recorded.

Next, a case where the encrypted content information recorded on the medium A is reproduced will be described. Media A
Is set in the media controller, and the media controller is set to the “data reproduction mode”. Copy the encryption key information EA (G1)
The encryption key G1 is decrypted by using a value obtained by adding α to A, which is D, and then the encrypted content information EG1 is decrypted by using the encryption key G1.
By decoding (X), the reproduced data X can be obtained. Here, since α = 0, it is equivalent to decoding using ID = A.

Next, data is transferred (moved) from the medium A (first medium) to the medium B (second medium).
Will be described. When transferring the encrypted content information from the transfer source medium A in which the content is recorded to the transfer destination medium B, first, the media controller
Is set. Set the mode of the media controller to “data transfer mode”.

Encryption key information EA (G1) and transfer source medium A
The ID of the (first medium) is temporarily recorded in the memory of the media controller in a form associated with the data link ID. This selects one management number Dn as the data link ID as shown in the memory block in the media controller of FIG. This may be in the form of serially assigning an ID within 64 bits starting from 0. When erasing the data link ID as described later, any method can be used as long as the data link ID can be managed without contradiction. In association with Dn, the encryption key information EA (G1), the ID of the medium A, the name of the content, and the like are recorded. In consideration of the case where a plurality of contents are recorded in the medium A, data such as a file name is recorded in relation to the Dn.

The data link ID is added to the encrypted content information EG1 (X1), and is copied to the transfer destination medium together with the encryption key information EA (G1). The encrypted content information and the encryption key information EA (G1) are transferred to the medium B at high speed via the media bus. The media bus physically connects the media A and the media B, and performs data transfer without the media controller. The data itself is highly secure because only the encrypted content data can pass through this media bus. FIG. 4B shows an encrypted content information structure. Media A
Transmits the encrypted content information EG1 (X1) and the encryption key information EA (G1) to the medium B, and then the encryption key information EA (G1) in the transfer source medium A is deleted. Further, considering security, it is desirable to delete the encrypted content information EG1 (X1), but if only the encryption key information EA (G1) is deleted, it is considered that the decryption of the encryption is almost impossible.

The inside of the media and the media controller cannot perform unauthorized access from the outside, such as an external backup medium or a terminal such as a PC. Is executed.

Next, the medium B is set in the media controller. The media controller reads the ID of the connected transfer destination medium B, and then reads the data link ID added to the encrypted content information EG1 (X1) already transferred.
Read Dn. Also, the encryption key information EA (G1) is read at the same time. The media controller is in the “data transfer mode” at this point, so that data recorded in the same area as the difference ID can be recognized as the data link ID Dn. Based on this, the encryption key information EA (G1) associated with the data link ID Dn and the ID of the transfer source medium ID (A) are read from the memory of the media controller.

Here, the EA (G1) read from the transfer destination medium B is compared with the EA (G1) read from the controller memory. If the key information does not match, no difference ID, which is the following process, is issued. That is, if they do not match, it can be recognized as information of different contents even if the data link ID is the same. This is to avoid a problem that occurs when data is moved from the same medium A using a plurality of media controllers, or to store data in the memory in the media controller or the media in an attempt to copy illegally. It finds inconsistencies that occur when data is falsified, and is effective in stopping functions.

Next, when the authentication results in a match, if the transfer media B and the transfer media A have different IDs,
Record the ID and (AB) value on the transfer destination medium B. After the recording, the encryption key information EA (G1) and the ID (A) of the transfer source medium A recorded in the memory of the media controller are deleted. The contents of the medium B at this point are shown in the block of the medium B in FIG.

This erasing operation allows data to be transferred (moved), not copied between media. Originally, encryption using ID was very effective, but had the disadvantage that it could only be played back on that medium, but manages encryption key information and media ID information in a media controller that cannot be operated from the outside However, by deleting at the same time as copying, it is possible to provide a user-friendly system. The data structure after data movement is as shown in FIG. First 64 after moving
The bit data link ID information is rewritten as difference ID data information.

Next, a case where the encrypted content information EG1 (X1) moved to the medium B is reproduced will be described. The reproduction procedure is the same as the procedure for reproducing the media A after the distribution. That is, when reproducing the encrypted content information recorded on the medium B, the medium B is set in the media controller, and the media controller is set to the “play mode”. The encryption key information EA (G1) is decrypted using the value obtained by adding α to B, which is its own ID, that is, B + (AB), and then the encryption key G1 is encrypted using the encryption key G1. Content information EG1
By decoding (X1), the reproduced data X1 can be obtained. Difference
Since the ID is α = AB, it is equivalent to decoding using ID = A, and reproduction is possible.

Next, a case where the encrypted content information is copied from the transfer source medium A in which the content is recorded to the backup medium will be described. The backup medium is a general term for media that cannot be attached to and detached from the media controller. That is, this case corresponds to a case in which a controller of the present method is not provided, such as a hard disk of a PC or a recordable optical disk. Here, a hard disk connected to the terminal PC is used as a backup medium.

First, the medium A is set in the media controller, and the media controller is set in the "backup output mode".
And Connect the media controller to the PC terminal. The encryption key information EA (G1) and the ID of the transfer source medium A are recorded in the memory of the media controller in a form associated with the data link ID. This selects one management number Dn as the data link ID as shown in the memory block in the media controller of FIG. In association with this Dn, the encryption key information EA (G1) and the ID of the medium A are recorded. The data link ID is added to the encrypted content information EG1 (X1) and transferred to the hard disk connected to the terminal PC together with the encryption key information EA (G1) via the media controller. FIG. 5 shows an encrypted content information structure.

Next, a case where the encrypted content information is copied from the backup medium in which the content is recorded to the transfer destination medium B will be described. First, the medium B is set in the media controller, and the media controller is set to the “backup input mode”. Connect the media controller to the PC terminal. The first 64 bits of the encrypted content data recorded on the backup medium are always the data link Dn. The encrypted content information EG1 (X1) and the encrypted key information EA (G1) to which the data link ID is added are copied to the transfer destination medium B.

The media controller reads the ID (B) of the connected transfer-destination medium, and reads the encrypted content information EG1.
The data link ID added to (X1) is read, and the encryption key information EA (G1) is read. Based on this, the encryption key information EA (G1) associated with the data link ID and the transfer source medium ID (A) are read from the memory of the media controller,
The encryption key information EA (G1) read from the transfer destination medium B is compared with the encryption key information EA (G1) read from the controller memory.

If the authentication results in a match, a difference ID, which is a difference value between the IDs of the transfer destination medium B and the transfer source medium A,
(AB) Record the value on the transfer destination medium B. After the recording, the encryption key information EA (G1) and the ID (A) of the transfer source medium recorded in the memory of the media controller are deleted. This backup operation is equivalent to a case where data is moved from the medium A to the medium B in FIG. 3 and a case where data is temporarily backed up from the medium A to a backup medium and then moved to the medium B.

When the encrypted content information EG1 (X1) moved from the backup medium to the medium B is reproduced, the procedure for reproducing the distributed medium A is the same as that described above. That is, when reproducing the encrypted content information EG1 (X1) recorded on the medium B, the medium B is set in the media controller, and the media controller is set to the “data reproduction mode”. Encryption key information EA (T1D)
Is a value obtained by adding α to B which is own ID, that is, B + (A−
B) to decrypt the encryption key G1, and then decrypt the encrypted content information EG1 (X) using the encryption key G1 to obtain the reproduction data X. Since the difference ID α = AB, ID = A
And it is possible to reproduce.

Although the method has been described assuming that the encrypted content information is encrypted by the public key method, the content information is distributed from the center with the common key G of the terminal, and the terminal can also use the decryption key G. . In addition, although the description has been made on the assumption that the key is encrypted with the ID unique to the medium, the encryption may be performed not on the ID itself but on the key using information obtained by converting the ID using a predetermined function.

Next, a block diagram of an embodiment of the present invention will be described with reference to FIG. First, a case where content data is received from the distribution center to the media A will be described.
First, the medium A is set in the media controller 21.
The media controller is set in the terminal T1, and “data recording mode” is set in the mode setting unit 51 of the media controller from the external interface. When predetermined procedures such as charging and authentication are completed, the content data is encrypted from the center with a predetermined encryption key (content key) G1 and the terminal T
1 will be distributed. In the case of the “data recording mode”, the mode setting unit 51 instructs the difference ID generation unit 52 to generate “0”. The media controller receives the encrypted content data, writes 64-bit data indicating “0” to the header in the encrypted content data header writing unit 53, and stores the encrypted content information EG1 (X1) in the memory unit of the medium A. Record at 33. Mode setting unit 51
Is set to “data recording mode”, the switch 2 is switched to be connected to the difference ID generating unit 52.

On the other hand, the signal generated by the media ID generating unit 31 on the media side detects the media ID (A) by the media ID reading unit 54 of the media controller, and uses the ID (A) to encrypt the content encryption key. G1 to the key encryption unit 5
The encrypted key information EA (G1) is created by encrypting in step 5 and recorded in the memory unit 33 via the memory information recording and erasing control unit 32 of the medium. The header indicates the difference ID, and 0 is recorded at this time. Figure 4 shows the data structure immediately after distribution
This is shown in (1). The data has a difference ID of 64 bits at the beginning, encryption key information of 64 bits, and encrypted content information after the difference ID.

Next, a case where the encrypted content information EG1 (X1) recorded on the medium A is reproduced will be described. The medium A is set in the media controller 21, and the "data reproduction mode" is set in the mode setting section 51 of the media controller from the external interface. Media controller 21
Is the encryption key information EA (G
1) is read and transmitted to the encryption key decryption unit 56. The signal generated by the media ID generation unit 31 on the media side detects the media ID (A) by the media ID reading unit 54 of the media controller and transmits the signal to the encryption / decryption unit 56. Further, the media controller 21 reads the encrypted content information EG1 (X1) from the memory unit 33 of the medium via the memory information recording and erasing control unit 32, and transmits it to the encrypted content data header reading unit 57. The encrypted content data header reading unit 57 reads the leading 64 bits of difference data, and transmits the difference data to the difference ID reading unit 58 via the switch 1.

In the case of the “data reproduction mode” by the mode setting section 51, the switch 1 has been switched to the difference ID reading section 58. The difference ID detected by the difference ID reading unit 58 is transmitted to the encryption key decryption unit 56. The encryption key decryption unit 56 adds the input difference ID and media ID, generates an ID, and decrypts the encryption key G1. Here is the difference
Since ID = 0, it is equivalent to decoding using ID = A.
The decrypted encryption key G1 is used as the encrypted content data decryption unit 5
9 is transmitted. The encrypted content data whose header has been removed by the encrypted content data header reading unit 57 is transmitted to the encrypted content decryption unit 59. The encrypted content data decryption unit 59 decrypts the encrypted content data using the input encrypted content data EG1 (X1) and the encryption key G1, and outputs the decrypted content data as reproduction data X.

Next, a case where data is transferred (moved) from the medium A to the medium B will be described. When copying the encrypted content information from the transfer source medium A in which the content is recorded to the transfer destination medium B, first, the medium A is set in the media controller 21. The “data transfer output mode” is set in the mode setting unit 51 of the media controller from the external interface.

The signal generated by the media ID generating unit 31 detects the media ID (A) by the media ID reading unit 54 of the media controller and transmits the signal to the recording / reproduction erasing control unit 61 of the memory 60 in the media controller. Is done. At the same time, the encryption key information EA (G1) is called from the medium A,
Recording / reproduction / erasure control unit 6 of the memory 60 in the media controller
1 is sent. Further, the data link ID is generated by the data link ID generation section 62 and the data
0 is transmitted to the recording / reproducing / erasing control unit 61. The encryption key information EA (G1) and the ID of the transfer source medium A are recorded in the memory 60 of the media controller in a form associated with the data link ID. Data link, as described below
When deleting an ID, the deleted information is transmitted to the data link ID generation unit, so that an ID that can be managed without contradiction can be generated.

At the same time, the data link ID generation section 62 also transmits the data link ID to the encrypted content data header writing section 53. When “data transfer output mode” is set in the mode setting unit 51, the switch 2 is switched so as to connect to the data link ID generation unit 62. Encrypted content data header writing unit 5
At 3, the encrypted content data is read from the memory unit 33 of the medium A, the data link ID is written in the header, and the data is temporarily returned to the memory 33 of the medium.

The returned encrypted content data is stored in the data transfer area together with the encryption key information, and is transferred to the medium B via the media bus 34 at a high speed.
The media bus 34 physically connects the media A and the media B, and performs data transfer without a media controller. The data itself is highly secure because only the encrypted content data can pass through this media bus.

Thereafter, the setting mode of the memory information recording and erasing control unit 32 on the medium side is set to “data transfer output mode”.
Then, the encryption key information EA (G1) in the transfer source medium A is deleted. FIG. 4B shows an encrypted content information structure.

Next, the medium B is set in the medium controller 21. Media ID reading unit 5 of media controller
4 to detect the media ID (B). Then, the encrypted content information EG1 (X1) already transferred and recorded in the memory unit 32B of the medium B is transmitted to the encrypted content data header reading unit 57. Further, it reads the encryption key information EA (G1) recorded on the medium B.

When "data input movement mode" is set in the mode setting section 51, the switch 1 is set to the data link mode.
It is switched to connect to the ID reading unit 63. In the data link ID reading section 63, the data link attached to the header of the encrypted content information EG1 (X1)
The ID is read and transmitted to the recording / reproduction / erasure control unit 61 of the memory 60 in the media controller. Recording / reproduction / erasure control unit 61
Then, based on the data link ID, the encryption key information EA (G1) associated with the data link ID Dn and the ID (A) as the ID of the transfer source medium are read from the memory 60 of the media controller.

Here, the encryption key information EA (G1) read from the transfer destination medium B and the encryption key information EA (G1) read from the media controller memory 60 are compared with the encryption key verification unit 6
4 and collated. If the key information does not match, no difference ID, which is the following process, is issued. The collation result is transmitted to the difference ID generation unit 52. If the collation results match, the ID (A) is transmitted to the difference ID generation unit 52. Difference I
In the D generating unit 52, the input ID (A) and the ID of the transfer destination medium read by the media ID reading unit 54 (B)
And sends the difference ID (AB) value to the encrypted content data header writing unit 53.

When the “data input movement mode” is set in the mode setting section 51, the switch 2 is switched so as to be connected to the difference ID generation section 52. The encrypted content data header writing unit 53 rewrites the header of the encrypted content data with the target data link ID to the value of the difference ID.

Thereafter, the encrypted content data header writing section 53 outputs a write completion signal to the recording / reproduction / erasure control section 61 of the memory 60 in the media controller,
The recording / reproduction / erasure control unit 61 erases the encryption key information EA (G1) and the ID (A) of the transfer source medium. The data structure after data movement is as shown in FIG. The first 64-bit data link ID information after the end of the movement is rewritten as difference ID data information.

Next, a case where the encrypted content information moved to the medium B is reproduced will be described. The reproduction procedure is the same as the procedure for reproducing the media A after the distribution. That is, when reproducing the encrypted content information EG1 (X1) recorded on the medium B, the medium B is set in the media controller 21 and the media controller is set to the “data reproduction mode”. The media controller 21 reads the encryption key information EA (G1) from the memory unit 33B of the medium B, and transmits it to the encryption key decryption unit 56. The signal generated by the media ID generation unit 31B on the media side is transmitted to the media ID reading unit 54 of the media controller by the media ID reading unit 54.
(B) is detected and transmitted to the encryption / decryption unit 56. Also,
The media controller 21 reads out the encrypted content information EG1 (X1) from the memory unit 33B of the medium B, and sends it to the encrypted content data header reading unit 57. The encrypted content data header reading unit 57 reads the leading 64 bits of difference data, and transmits the difference data to the difference ID reading unit 58 via the switch 1.

In the case of the “data reproduction mode” by the mode setting section 51, the switch 1 has been switched to the difference ID reading section 58. The difference ID detected by the difference ID reading unit 58 is transmitted to the encryption key decryption unit 56. The encryption key decryption unit 56 adds the input difference ID and media ID, generates an ID, and decrypts the encryption key G1. Here is the difference
ID = A = B, which is equivalent to decoding using ID = B + (AB), that is, ID = A. The decrypted encryption key G1 is transmitted to the encrypted content data decryption unit 59. The encrypted content data EG1 (X1) whose header has been removed by the encrypted content data header reading unit 57 is transmitted to the encrypted content decryption unit 59. The encrypted content data decrypting section 59 decrypts the encrypted content data using the input encrypted content data EG1 (X1) and the encryption key G1, and outputs the decrypted content data as reproduction data.

Next, a case where the encrypted content information is copied from the transfer source medium A in which the content is recorded to the backup medium 70 will be described. First, the medium A is set in the media controller 21. The “backup output mode” is set in the mode setting unit 51 of the media controller from the external interface. The media controller 21 is connected to the terminal T1. The terminal T1 is connected to the backup medium 70.

The signal generated by the media ID generating section 31 detects the ID (A) of the medium A by the media ID reading section 54 of the media controller, and sends the signal to the recording / reproduction / erasing control section 61 of the memory 60 in the media controller. Sent.
At the same time, the encryption key information is called from the medium A and transmitted to the recording / reproduction / erasure control unit 61 of the memory 60 in the media controller.

Further, the data link ID is generated by the data link ID generation section 62 and transmitted to the recording / reproduction erasure control section 61 of the memory 60 in the media controller. The encryption key information EA (G1) and the ID of the transfer source medium A are recorded in the memory 60 of the media controller in a form associated with the data link ID. The data link ID generation unit 62 also transmits the data link ID to the encrypted content data header writing unit 53 at the same time. When “backup output mode” is set in the mode setting unit 51, the switch 2 is switched to be connected to the data link ID generation unit 62. The encrypted content data header writing unit 53 reads the encrypted content data from the memory unit 33 of the medium A, and writes the data link ID in the header. The encrypted content data EG1 (X1) in which the data link ID is written is together with the encryption key information EA (G1) read from the memory unit 33 of the medium A.
The data is transmitted to the backup medium 70 via the terminal T1. FIG. 4B shows an encrypted content information structure. Thereafter, the encryption key information EA (G1) in the transfer source medium A is erased by the memory information recording and erasing control unit 32.

Next, a case where the encrypted content information is transferred from the backup medium 70 in which the content is recorded to the transfer destination medium B will be described. First,
The medium B is set in the media controller 21 and the media controller 21 is set to the “backup input mode”. The media ID (B) of the media is detected by the media ID reading unit 54 of the media controller. Next, the up-media 70
From the terminal device T1 to the encrypted content data EG1 (X1)
And the encrypted key information EA (G1), and passes the encrypted content data EG1 (X1) and the encrypted key information EA (G1) through the encrypted content data header writing unit 53,
The data is recorded in the memory unit 33B of the medium B.

Subsequently, the encrypted content information EG1 (X1) is transmitted from the memory unit 33B of the medium B to the encrypted content data header reading unit 57. When the “backup input mode” is set in the mode setting section 51, the switch 1 is switched so as to connect to the data link ID reading section 63. The data link ID reading section 63 reads the data link ID attached to the header of the encrypted content information EG1 (X1), and transmits the data link ID to the recording / reproduction / erasure control section 61 of the memory 60 in the media controller. Further, it reads the encryption key information EA (G1) from the memory unit 33B of the medium B. Based on this data link ID, the recording / reproduction / erasure control unit 61 reads from the memory of the media controller the encryption key information EA (G1) associated with the data link ID Dn and the ID (ID) of the transfer source medium. Read A).

Here, EA (G1) read from the transfer destination medium B and EA (G1) read from the controller memory 60 are transmitted to the encryption key verification unit 64 for verification. If the key information does not match, no difference ID, which is the following process, is issued. The collation result is transmitted to the difference ID generator 52, and if the collation results match, the ID (A) is transmitted to the difference ID generator.

The difference ID generator 52 inputs the ID (A)
And the ID (B) of the transfer destination medium read by the media ID reading unit 54, and transmits the difference ID (AB) value to the encrypted content data header writing unit 53. When “backup input mode” is set in the mode setting unit 51, the switch 2 is switched so as to be connected to the difference ID generation unit 52. The encrypted content data header writing unit 53 rewrites the header of the encrypted content data EG1 (X1) with the target data link ID to the value of the difference ID. After that, the encrypted content data header writing section 53 outputs a write completion signal to the recording / reproduction / erasure control section 61 of the memory 60 in the media controller, and the recording / reproduction / erasure control section 61 transmits the encryption key information EA (G1). And erase the ID (A) of the transfer source media.

The data structure after the data transfer is as shown in FIG. The first 64-bit data link ID information after the end of the movement is rewritten as difference ID data information.

Next, a case where the encrypted content information moved from the backup medium 70 to the medium B is reproduced will be described. The reproduction procedure is the same as the procedure for reproducing the media A after the distribution. That is, when reproducing the encrypted content information EG1 (X1) recorded on the medium B, the medium B is set in the media controller 21 and the media controller is set to the “data reproduction mode”.

The media controller 21 reads the encryption key information EA (G1) from the memory unit 33B of the medium B and sends it to the encryption key decryption unit 56. The signal generated by the media ID generation unit 31B on the media side is transmitted to the media ID reading unit 54 of the media controller by the media ID reading unit 54.
(B) is detected and transmitted to the encryption key decryption unit 56. Further, the media controller reads the encrypted content information EG1 (X1) from the memory unit 33B of the medium B, and transmits it to the encrypted content data header reading unit 57. The encrypted content data header reading unit 57 reads the leading 64 bits of difference data, and transmits the difference data to the difference ID reading unit 58 via the switch 1.

In the case of the “data reproduction mode” by the mode setting section 51, the switch 1 has been switched to the difference ID reading section 58. The difference ID detected by the difference ID reading unit 58 is transmitted to the encryption key decryption unit 56. The encryption key decryption unit 56 adds the input difference ID and media ID, generates an ID, and decrypts the encryption key G1. Here is the difference
ID = AB, which is equivalent to decoding using ID = B + (AB), that is, ID = A. The decrypted encryption key G1 is transmitted to the encrypted content data decryption unit 59. Further, the encrypted content data EG1 (X1) whose header has been removed by the encrypted content header reading unit 57 is transmitted to the encrypted content data decrypting unit 59. The encrypted content data decryption section 59 decrypts the encrypted content data using the input encrypted content data EG1 (X1) and the encryption key G1, and outputs the decrypted content data as reproduction data X1.

As described above, according to the present embodiment, it is possible to transfer the media on which the content data is recorded between users while preventing unauthorized copying, and it is not always necessary to transfer the media in which the content data is recorded to a charging management institution, a data management center, or the like. It enables a user to obtain content data without connecting.

Further, according to the present embodiment, when one user has a plurality of media, data is moved between the media or a temporary backup is performed while preventing unauthorized copying. A system for restoring data to any media can be provided.

Further, the medium controller has a removable media controller. The media controller has a memory. When moving the encrypted content information EG1 (X1) between the media, the encryption key information is used. When EA (G1) is temporarily recorded in the memory, and after the transfer is completed, the encryption key information EA (G1) is erased and moved to the backup medium, the encryption key information EA is restored until the next recovery from the backup medium. (G1) is temporarily recorded in the memory, and the encryption key information EA (G1) is erased at the time of restoration. It is possible to freely move data between media while preventing copying to media.

Further, the encryption key information EA (G1) of the source medium temporarily recorded in the memory in the media controller and the encryption key information EA (G1) of the source medium read from the destination medium are stored. A problem that occurs when data is moved from the same medium A using a plurality of media controllers because the same ID is generated and the difference ID is generated and recorded only when the same is authenticated. Can be avoided. Furthermore, this authentication function is effective in finding the data in the memory in the media controller or inconsistency that occurs when trying to falsify the data in the medium in order to copy illegally, and is effective in stopping the function.

[0068]

According to the present invention, it is possible to transfer a medium on which content data is recorded between users while preventing unauthorized copying, and it is not always necessary to connect to a charging management institution, a data management center, or the like. Both allow users to obtain content data.

Further, according to the present invention, when one user has a plurality of media, data can be moved between the media or temporarily backed up, and then, while preventing unauthorized copying, arbitrary A system for restoring data to another medium.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining encryption at the time of data distribution used in one embodiment.

FIG. 2 is a diagram showing a configuration of one embodiment.

FIG. 3 is a functional explanatory diagram of one embodiment.

FIG. 4 is a diagram illustrating a data structure in a medium according to an embodiment;

FIG. 5 is a diagram showing a data structure in a backup medium according to an embodiment.

FIG. 6 is a block diagram showing a detailed configuration of one embodiment.

[Explanation of symbols]

21 media controller (content information processing device, content information restoring device) 52 difference ID generating unit (unique ID information forming unit) 53 encrypted content data header writing unit (data link ID writing unit) 56 encryption key decryption unit (contents) Key recovery unit) 59 Encrypted content data decryption unit (content information recovery unit) 60 Memory in media controller (memory for temporarily recording information related to media ID of first medium) 61 Recording / reproduction / erasure control unit (erasure unit / memory) Readout unit) 64 Encryption key authentication unit (encryption key information matching unit) 70 Backup media

Continued on the front page F term (reference) 5B017 AA06 BA05 BA07 BB03 CA07 CA09 CA16 5D044 AB05 AB07 CC04 DE49 DE52 GK17 HL08 5J104 AA07 KA01 KA05 NA02 NA36 NA38 NA41 NA42 PA14 9A001 EE03 LL03

Claims (14)

[Claims] 1. An encrypted content information encrypted with a predetermined content key and information on a media ID of a first medium on which the encrypted content information is recorded are stored in an ID.
A content information recording method for recording the encrypted content information and the encryption key information on a second medium from the first medium on which encryption key information obtained by encrypting the content key is recorded as a key. Information about the media ID of the first medium is temporarily recorded in a predetermined memory other than the first and second media, and the encrypted content information and the encryption key information are stored in the first medium. Is recorded on a backup medium, and the encryption key information is deleted from the first medium. Then, the encrypted content information and the encryption key information are transferred from the backup medium to the second medium. Information about the media ID of the second medium and the medium of the first medium temporarily recorded in the memory. D
The unique ID information formed from the
Recording information on the medium ID of the first medium that has been temporarily recorded from the memory. 2. An encrypted content information encrypted with a predetermined content key and information on a media ID of a first medium on which the encrypted content information is recorded are stored in an ID.
A content information recording method for recording the encrypted content information and the encryption key information on a second medium from the first medium on which encryption key information obtained by encrypting the content key is recorded as a key. And temporarily storing information relating to the media ID of the first medium in a predetermined memory other than the first and second media in a form associated with a data link ID, wherein the encrypted content information and the encrypted The key information and the data link ID are recorded on a backup medium, and the encryption key information is deleted from the first medium. Thereafter, the encrypted content information and the encryption key information are deleted from the backup medium. And the data link I
D on the second medium and the data link I read from the second medium.
Based on D, information on the media ID of the first medium temporarily recorded in the memory is obtained, and is formed from information on the media ID of the first medium and information on the media ID of the second medium. The unique ID information is recorded on the second medium, and the media ID of the temporarily recorded first medium is recorded from the memory.
A content information recording method characterized by erasing information about a content. 3. An encrypted content information encrypted with a predetermined content key and information on a media ID of a first medium on which the encrypted content information is recorded are stored in an ID.
A content information recording method for recording the encrypted content information and the encryption key information on a second medium from the first medium on which encryption key information obtained by encrypting the content key is recorded as a key. Temporarily storing information related to a media ID of the first medium and the encryption key information in a predetermined memory other than the first and second media in a form associated with a data link ID; Recording the encrypted content information, the encryption key information, and the data link ID on a backup medium, erasing the encryption key information from the first medium, and then deleting the encrypted content from the backup medium. Information, the encryption key information, and the data link I.
D on the second medium and the data link I read from the second medium.
Based on D, information about the media ID of the first medium temporarily recorded in the memory and the encryption key information are obtained, and the encryption key information read from the second medium and read from the memory The encryption key information is compared with the encryption key information, and only when the two encryption key information have a single value,
Information about the media ID of the second medium and the medium I of the first medium read from the memory
Recording unique ID information formed from information related to the first medium on the second medium and erasing the temporarily stored information on the medium ID of the first medium and the encryption key information from the memory. A content information recording method characterized by the following. 4. The information about the media ID of the first medium temporarily recorded in the memory is information based on the media ID of the first medium read from the first medium, and The content information according to any one of claims 1 to 3, wherein the information on the media ID of the media is information based on the media ID of the second media read from the second media. Recording method. 5. The unique ID information according to claim 1, wherein said unique ID information is difference ID information which is a difference value between a media ID of said first medium and a media ID of said second medium. The content information recording method according to any one of the above. 6. The predetermined content key is a common key or a public key, and the ID key is a common key using a media ID of the first medium or a medium I of the first medium.
The content information recording method according to any one of claims 1 to 5, wherein the common information is a common key using information obtained by converting D by a predetermined function. 7. An encrypted content information encrypted with a predetermined content key and information on a media ID of a first medium on which the encrypted content information is recorded are stored in an ID.
The encrypted content information and the encryption key information are recorded on a second medium via a backup medium from the first medium in which encryption key information obtained by encrypting the content key is recorded as a key. A content information processing apparatus for processing information relating to the ID of each medium at the time of the operation, comprising: a memory for temporarily recording information relating to a media ID of the first medium; information relating to a media ID of the second medium; and the memory ID of the first medium temporarily recorded in
After the encrypted content information and the encryption key information are recorded from the backup medium to the second medium, the unique ID information is stored in the second medium. Content information, comprising: unique ID information forming means for recording on a medium; and erasing means for erasing information about the medium ID of the first medium temporarily recorded from the memory after the formation of the unique ID information. Processing equipment. 8. An encrypted content information encrypted with a predetermined content key and information on a media ID of a first medium on which the encrypted content information is recorded are stored in an ID.
The encrypted content information and the encryption key information are recorded on a second medium via a backup medium from the first medium in which encryption key information obtained by encrypting the content key is recorded as a key. A content information processing apparatus for processing information relating to the ID of each of the media at the time of recording, wherein a memory for temporarily recording information relating to the media ID of the first medium in a form associated with a data link ID; Data link ID writing means for recording an ID on the first medium, after the encrypted content information, the encryption key information, and the data link ID are recorded from the backup medium on the second medium And storing the data in the memory based on the data link ID read from the second medium. Obtaining information about media ID of the first media recorded media ID of the first medium
ID information is formed from the information about the second medium and the information about the media ID of the second medium.
Unique ID information forming means for recording information on the second medium; and erasing means for erasing information about the temporarily recorded medium ID of the first medium from the memory after the formation of the unique ID information. A content information processing apparatus characterized by the following. 9. An encrypted content information encrypted with a predetermined content key and information on a media ID of a first medium on which the encrypted content information is recorded are stored in an ID.
The encrypted content information and the encryption key information are recorded on a second medium via a backup medium from the first medium in which encryption key information obtained by encrypting the content key is recorded as a key. A content information processing apparatus for processing information relating to the ID of each medium at the time of recording, wherein information relating to the media ID of the first medium and the encryption key information are temporarily recorded in a form associated with a data link ID A data link ID writing means for recording the data link ID on the first medium; and a means for storing the encrypted content information, the encryption key information, and the data link ID in the second medium from the backup medium. After being recorded on the medium, the data link ID read from the second medium is Memory reading means for reading the information about the media ID of the first medium and the encryption key information temporarily recorded from the memory; the encryption key information read from the second medium; An encryption key information matching unit that matches the encryption key information read from the memory by the reading unit; and the encryption key information matching unit determines that the two pieces of encryption key information are unique. Only when, the unique ID information is formed from the information on the media ID of the second medium and the information on the media ID of the first medium read from the memory, and the unique ID information is recorded on the second medium. Unique ID information forming means, and a medium of the first medium temporarily recorded from the memory after the formation of the unique ID information Content information processing apparatus is characterized by providing an erasing means for erasing the information and the encrypted key information about D. 10. The information relating to the media ID of the first medium temporarily recorded in the memory is information based on the media ID of the first medium read from the first medium, and The content information according to any one of claims 7 to 9, wherein the information on the media ID of the medium is information based on the media ID of the second medium read from the second medium. Processing equipment. 11. The unique ID information includes a media ID of the first medium and a media ID of the second medium.
The content information processing apparatus according to claim 7, wherein the content information is difference ID information that is a difference value from the content information. 12. The predetermined content key is a common key or a public key, and the ID key is obtained by converting a common key using a media ID of a first medium or a media ID of the first medium by a predetermined function. The content information processing apparatus according to any one of claims 7 to 11, wherein the content information processing apparatus is a common key using the obtained information. 13. An encrypted content information encrypted with a predetermined content key, encryption key information obtained by encrypting the content key using information on a media ID of another medium as an ID key, and A backup medium characterized by recording a data link ID as link destination information to information on a media ID. 14. The predetermined content key is a common key or a public key, and the ID key is obtained by converting a common key using a media ID of the other medium or a media ID of the other medium by a predetermined function. 14. The backup medium according to claim 13, wherein the backup medium is a common key using the obtained information.