JPH11296980A - Duplication preventing method for optical disk and optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent duplication of a program recorded along many signal tracks in an optical disk. SOLUTION: This method is a preventing method for duplication of an optical disk characterized in that after recording condition of many signal tracks Tare severely specified within tolerance of a standard value of an optical disk, the many signal tracks T are formed by extending a recording time to an external peripheral part of an optical disk 1 out of a standard recording time H1 , also, key data for preventing duplication is recorded in a key data region of the external peripheral part out of the standard recording time, while control data referring to the key data for preventing duplication is recorded in a program region 1c in which a program is recorded in the standard recording time H1 , when the optical disk 1 is reproduced, after control data is read initially, key data for preventing duplication is referred based on control data, and reproduction of the program is permitted by this key data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a program (software) recorded along a number of signal tracks on an optical disk.
The present invention relates to a method of preventing duplication of an optical disk and a method of preventing the duplication of the optical disk.

[0002]

2. Description of the Related Art In recent years, CD-ROMs (Co
mpact Disc-Read Only Memo
ry) and other programs (software) recorded on an optical disc such as CD-R (Recordable)
e) Optical disk duplication prevention methods and optical disks capable of preventing illegal copying (copying) onto an optical disk or a hard disk have been developed, but as one example of such a type, a program recorded on an optical disk such as a CD-ROM has been developed. Japanese Patent Laid-Open Publication No. Hei.
It is disclosed in -119561.

FIGS. 6A and 6B show a conventional CD-ROM.
It is a figure for explaining a duplication prevention method.

According to the CD-ROM duplication prevention method disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 4-119561, FIG.
When the CD-ROM 11 is created, a directory A for storing information indicating the storage locations and sizes of the files B, C,..., A file B, C. Unreferenced sector G
And predetermined data is written into this sector G,
The program itself refers directly to the sector G in the program stored in the D-ROM 11, and if predetermined data is not written in the sector G, the CD-R
By judging that the OM 11 has been copied and stopping the execution of the program, copying of the program recorded on the CD-ROM 11 is prevented.

[0005] That is, when the user uses the original CD-R
When the OM 11 is inserted into the optical disk drive and data reading is instructed, the OS such as a personal computer searches the directory A of the original CD-ROM 11 and finds the files B, C,. The data is recorded on a hard disk or the like, and further recorded from the hard disk as a CD-R (Recordable) 13 as a write-once optical disk as shown in FIG.
Is replicated to

Here, the CD-R 13 is a CD-ROM 1
1 adopts the same standard. And the above CD-R
13, a number of signal tracks are formed for a standard recording time (within 74 minutes) while strictly observing the standard of the optical disk, and various programs can be recorded along the number of signal tracks. The CD-R 13 has a capacity for recording the original CD-ROM 11.
Therefore, using this CD-R13,
Some people copy ROM 11 in large quantities knowing that it violates the law.

In this case, as described above, the CD-ROM 11
CD-R13 copied via hard disk,
The directory A and the files B, C... Designated in the directory A are copied,
Are not copied. When the copied CD-R 13 is mounted on an optical disk drive and a program stored in the CD-R 13 is started, the program is programmed in advance so as to directly refer to the sector G described above. ,
The location where the sector G should exist is accessed. However, there is no sector G in the copied CD-R13,
Since the predetermined data to be written does not exist at the position where the sector G should exist, the program is stored in the CD-ROM.
R13 can be determined to be a copy.

[0008]

In the CD-ROM duplication preventing method disclosed in Japanese Patent Laid-Open No. 4-119561, a signal (sector G) for anti-duplication recorded on the CD-ROM 11 is encrypted. In addition, since the signal for duplication prevention is not formed in a special shape, the CD-ROM 11 can be reproduced by the internal optical pickup using the commercially available optical disk drive as it is, and at the time of the reproducing operation. Although control can be performed within the standardized control program, the user can intentionally copy the entire original CD-ROM 11 onto the CD-R (write-once optical disk) 13 in its entirety.

The reason is as follows. A user intentionally alters the OS of a personal computer or the like to copy the entire original CD-ROM 11 without reading the directory A in the original CD-ROM 11. In this way, the directory A, the files B, C... (Including programs) registered in the directory A, and the sector G not registered in the directory A can all be copied within the standard recording time on the hard disk. I will. Therefore, the CD-R (write-once optical disc) 13 intentionally copied in large quantities from the hard disk is recorded in exactly the same state within the same standard recording time as that of the original CD-ROM 11. If you play the original CD-R
Each program can be reproduced exactly in the same manner as the OM11.

Note that the original CD-ROM 11 can be stored in a CD-R (write-once optical disk) 1 without using a hard disk.
Although an optical disk writer apparatus that directly duplicates the original CD-ROM 11 has already been developed, it is apparent that even in this case, if the OS is intentionally falsified, the entire original CD-ROM 11 can be entirely copied. .

Therefore, even if the OS is intentionally partially tampered and the entire original CD-ROM 11 is entirely copied onto a CD-R (write-once optical disk) 13, the copied CD
It is desired to develop a method of preventing duplication of an optical disk and an optical disk so that R13 cannot be reproduced by an optical disk drive device.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a first invention is to prevent duplication of a program recorded along a plurality of signal tracks in an optical disk. In the method, the recording conditions of the plurality of signal tracks are strictly maintained within an allowable range of the standard value of the optical disc, and the recording time of the plurality of signal tracks is extended to the outer peripheral portion of the optical disc outside the standard recording time. Forming and recording key data for preventing duplication in a key data area on the outer periphery outside the standard recording time, and key data for preventing duplication in a program area where the program is recorded within the standard recording time The control data to be referred to is recorded, and when the optical disc is reproduced, the control data is read first, and then the duplication protection is performed based on the control data. Referring to the key data of the use, a copy protection method of the optical disc and permits the reproduction of the program by the key data.

Further, in the optical disk duplication preventing method according to the first aspect of the present invention, the recording condition of the plurality of signal tracks is such that either one or both of a track pitch and a linear velocity of the signal tracks is set within an allowable range of the standard value. The lower limit value is set in the vicinity of the lower limit value.

According to a second aspect of the present invention, in an optical disk for preventing duplication of a program recorded along a number of signal tracks on an optical disk, the recording conditions of the number of signal tracks are set within an allowable range of a standard value of the optical disk. After strict adherence, the multiple signal tracks are formed to extend the recording time to the outer peripheral portion of the optical disk outside the standard recording time, and to prevent duplication in the key data area of the outer peripheral portion outside the standard recording time. And a control data for referring to the key data for preventing duplication in a program area in which the program is recorded within a standard recording time.

Further, in the optical disc of the second invention,
The recording condition of the plurality of signal tracks is characterized in that one or both of the track pitch and the linear velocity of the signal tracks are set near a lower limit value within an allowable range of the standard value.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for preventing duplication of an optical disk and an optical disk according to the present invention will be described below with reference to FIGS.
This will be described in detail with reference to FIG.

FIG. 1 is a plan view for explaining an optical disk according to the present invention, and FIGS. 2A to 2C are for explaining an optical disk according to the present invention and a CD-R obtained by copying this optical disk, respectively. FIG. 3 is a diagram for explaining a state in which the optical disk according to the present invention is reproduced by a commercially available optical disk drive, and FIG.
FIG. 5 is an operation flowchart for explaining a method of preventing duplication of an optical disk according to the present invention.

As shown in FIG. 1, an optical disc 1 according to the present invention has a CD (Compact Dic) having a diameter of 12 cm.
s), CD-ROM (Read Only Memory)
y), CD-I (Interactive), and the like, and the optical disc 1 is not recordable and is formed for reproduction only. In addition, the signal form of a number of signal tracks T spirally formed from the inner periphery to the outer periphery of the optical disc 1 and the signal form of a program recorded along the plurality of signal tracks T are compatible with commercially available optical disc drive devices. In order to maintain the performance, it conforms to the standard (standard value) of the optical disk. At this time, many signal tracks T spirally formed on the optical disc 1
It is well known that a pit row having an irregular shape is transferred by using a stamper created by electroforming from a master, so that detailed description is omitted.

Here, the CD, CD-ROM, C
The standard values of optical disks such as DI are standardized, including the disk shape (outer diameter, center hole diameter, thickness), recording conditions of signal tracks, signal forms of programs, and the like. Here, only the recording conditions of the above signal tracks will be described. The standard value of the track pitch of adjacent signal tracks is set to 1.6 ± 0.1 μm, and the linear velocity at the time of recording a large number of signal tracks is set. Is 1.20 ± 0.1 to 1.40 ± 0.1 m /
In addition, the value of the standard recording time of a program recorded along a number of signal tracks after satisfying the standard value of the track pitch and the standard value of the linear velocity is set within 74 minutes. . At this time, the linear velocity is a value obtained by multiplying the angular velocity (ω) during rotation of the optical disk by the radius (r) of one signal track, and the standard value of the standard value of the linear velocity is the radius of the signal track ( 1.2 depending on r)
It has changed from 0 to 1.40. The standard recording time is the maximum recordable time of a program that can be recorded in the program area while strictly observing the standard of the optical disc, and is formed in the lead-in area and the outermost periphery formed in the innermost periphery of the optical disc. It does not include the lead-out area. At this time, the standard recording time is a time that can be calculated from each standard value such as the track pitch of the adjacent signal tracks based on the standard of the optical disc, the linear velocity, and the outermost diameter of the program area.

Next, in the optical disc 1 according to the present invention, the recording conditions of the large number of signal tracks T are strictly maintained within the allowable range of the standard value of the optical disc, and the track pitch Tp adjacent to the large number of signal tracks T or the multiple By setting one or both of the linear velocities V when recording the signal track T in the vicinity of the lower limit value within the allowable range of the standard value,
A large number of signal tracks T are formed with a longer (longer) recording time than the standard recording time.

That is, as shown in FIG. 1, the optical disc 1 according to the present invention has a center hole 1a formed at the center of a diameter of 12 cm, and from the inner periphery to the outer periphery of the center hole 1a. A large number of signal tracks T are spirally formed. Then, the track pitch Tp of a large number of signal tracks T is set to, for example, 1.5 μm near the lower limit value within the allowable range of the standard value, so that the track pitch is narrower than the standard value of 1.6 μm. The linear velocities V of a large number of signal tracks T are set to, for example, 1.19 m near the lower limit value within the allowable range of the standard value.
/ Sec, and the standard value of the standard value is 1.20 to 1.4.
The linear velocity is lower than 0 m / sec. This allows
As shown in FIG. 2 (A), the recording time H ₂ by a number of signal tracks T of the optical disk 1 becomes 75 minutes or more is extended than the standard recording time H _{1 (=} within 74 min). In the embodiment, by setting both the track pitch Tp and the linear velocity V near the lower limit value within the allowable range of the standard value, a large number of signal tracks T are formed from the inner peripheral portion to the outer peripheral portion for approximately 80 minutes. although it has to to, not limited to this, the track pitch Tp and the linear velocity recording time H ₂ standard recording time by setting either near the bottom limit value in the allowable range of the standard values of V H _It can be extended more than one.

[0022] The optical disk 1 has a lead-in area 1b which records the lead-in signal to the innermost portion of the outside of the central hole 1a, following the lead-in area 1b control data and programs and a standard recording time H ₁ a program area 1c recorded within a key data area 1d of the key data for copy protection on the outer peripheral portion is recorded on _one outer standard recording time H followed program area 1c, lead outermost portion subsequent to the key data area 1d The lead-out area 1e on which the out signal is recorded is formed along many signal tracks T in the above order.

Then, the lead-in area 1 of the optical disc 1
to b, in which is recorded the time recorded values of H ₂ is the signal recorded by the key data area 1d from the program area 1c, the value of the recording time H ₂ is the value of more than 75 minutes are recorded. Further, in the program area 1c of the optical disk 1, control data for controlling so as to refer to the key data for duplication prevention recorded in the key data area 1d, and programs such as audio information, image information and computer data are recorded. ing. At this time, the control data is recorded in the program area 1c, and the signal track address at the beginning of the key data area 1d is specified here. Furthermore,
If the recording capacity of the programs recorded in the program area 1c is short relative to a standard recording time H _1, it is recorded to the standard recording time H within ₁ zero data as the dummy data following the end of the recording capacity of the program . The key data area 1d of the optical disk 1 is referred to by an instruction from the control data recorded in the program area 1c.
The key data for duplication prevention permitting the reproduction of the program recorded in c is recorded.

Next, as shown in FIG. 3, a commercially available optical disk drive 2 has an optical pickup 2a movable in the radial direction of the optical disk 1 for reproducing a signal of the optical disk 1, and a motor 2b. Optical disk 1 fixed to shaft
And a rotatable turntable 2c on which is mounted.

When the optical disk 1 formed as described above is mounted on a turntable 2c in a commercially available optical disk drive 2 and reproduction of the optical disk 1 is started, application software in the optical disk drive 2 is started. After the optical pickup 2a reads the lead-in area 1b in response to the command, the program area 1
Read the control data in c. Here, the optical pickup 2a
Read a signal track address at the beginning of the key data area 1d recorded as control data, search the key data area 1d at a high speed according to the signal track address, and find a match with the signal track address at the beginning of the key data area 1d. Only the key data for duplication prevention recorded in the key data area 1d can be read. Since data for permitting reproduction of the program recorded in the program area 1c is recorded in the key data for preventing duplication, the optical pickup 2a can now read the program. When the optical pickup 2a finishes reading the program, the optical pickup 2a returns to the original initial position in accordance with a command from the application software. After reading 1e, it returns to the original initial position. Therefore, the optical disc 1
The program in the program area 1c cannot be read unless the optical pickup 2a sequentially reads the control data in the program area 1c and the key data for duplication prevention recorded in the key data area 1d.

Next, the original optical disk 1 is
CD-R (Recordab) as write-once optical disc
le) Regarding the operation of illegally copying 6, FIGS. 2 and 4
Will be described together.

As shown in FIG. 4, an original optical disk 1 having a diameter of 12 cm is mounted in a commercially available optical disk drive 2 so as to be reproducible by an optical pickup 2a. In the personal computer 3, a hard disk 4 is mounted so as to be recordable by a magnetic head 3a upon receiving a signal from the optical disk 1 in the optical disk drive 2. A 12-cm diameter CD-R (Recordable) 6 as a write-once optical disc is a signal from the hard disk 4 in the personal computer 3 or a signal from the optical disc 1 in the optical disc drive 2 in the commercially available optical disc writer 5. In response, the optical pickup 5a is mounted so as to be recordable.

At this time, 12c as a write-once optical disc
CD-R (Recordable) 6 of m diameter is a CD,
CD-ROM, are formed in compliance with the same standards as CD-I, the recording capacity of a number of signal tracks in the CD-R6 is set in the standard recording time H _{1 (74} min) At the same time, signal track addresses have been recorded in advance on a large number of signal tracks, and recording according to the recording capacity recorded in the CD-R 6 is performed in a lead-in area formed at the innermost periphery of the CD-R 6. Description will be made below assuming that the time is recorded.

That is, when the user inserts the original optical disk 1 into the optical disk drive 2 and instructs to read data, the optical pickup 2a operates in the same manner as described above. The control data in the HDD, the key data for duplication prevention recorded in the key data area 1d, and the program in the program area 1c are reproduced in this order. 1 are recorded in the order of reproduction. Thereafter, the order of the signals recorded on the hard disk 4 in the personal computer 3 is returned to the same order as that of the optical disk 1, and the signals recorded on the hard disk 4 are further processed so as to be within the standard recording time H ₁ (74 minutes). In this state, the signal recorded on the hard disk 4 is read by the optical pickup 5a in the optical disk writer device 5 to the CD-ROM.
When copied to R6, CD-R6 copied in the state shown in FIG. 2B is obtained.

As shown in FIG. 2B, the CD-R 6 obtained by duplicating the original optical disk 1 via the hard disk 4 as described above has a lead formed on the innermost periphery outside the center hole 6a. standard recording time-in area 6b _{H 1}
The control data and the program are recorded in the program area 6c following the lead-in area 6b, and the key data for preventing duplication is recorded in the key data area 6d following the program area 6c. although being, due to the presence in the key data area 6d is the standard recording time H _1, the signal track address key data area 6d is lost instead of the signal track address corresponding to the CD-R6, the program area 6c The signal track address of the key data area 6d cannot be read by the recorded control data, and it can be determined that the CD-R 6 is illegally copied as described later. Note that a lead-out area 6e is formed following the key data area 6d in the CD-R 6.

On the other hand, depending on the user, the OS of the personal computer 3 is intentionally partially altered, or
It is also conceivable that the OS of the optical disk writer device 5 is intentionally partially tampered to copy the entire original optical disk 1 entirely. In the case of this whole copying, the optical pickup 2a in the optical disk drive 2 ignores the control data recorded in the program area 1c and moves the optical disk 1 from the innermost peripheral lead-in area 1b through the program area 1c. Key data area 1 at the outer periphery
Since the signals are reproduced in d order, the signals in the reproduction order of the optical disk 1 are recorded on the hard disk 4 by the magnetic head 3a in the personal computer 3 in response to these signals. Thereafter, the signal recorded on the hard disk 4 is read by the optical pickup 5a in the optical disk writer device 5 to the C signal.
Although the above signals are copied to the D-R6, the CD-R
The standard recording time H ₁ of 6 is set on that adhere to standard optical disc status, recording of the key data area of the outer peripheral standard recording time H ₁ outside is not performed, that shown in FIG. 2 (C) To obtain CD-R6 duplicated. Needless to say, the CD-R is written on the optical disk writer device 5 without passing through the personal computer 3 from the optical disk drive device 2.
6 is duplicated.

Then, as shown in FIG. 2C, a CD obtained by duplicating the entire original optical disc 1 as described above.
-R6 the center hole 6a and the values in the standard recording time H ₁ in the lead-in area 6b formed in the innermost portion is recorded outside of the program area 6 following the lead-in area 6b
although the control data and programs in c are recorded, can not be recorded to the key data area of the outer peripheral portion in the standard recording time H ₁ outside those CD-R6 is illegally duplicated as described below It can be determined that there is. In addition, CD-R6
Lead area 6e following the program area 6c
Are formed.

Next, an operation flow for judging that the CD-R 6 is an illegally copied one when reproducing the CD-R 6 obtained by duplicating the original optical disc 1 will be described with reference to FIGS. Will be explained.

In step 1 of FIG. 5, the CD-R 6 obtained by duplicating the original optical disk 1 is inserted into the turntable 2 in the commercially available optical disk drive 2 shown in FIG.
c.

Next, in step 2 of FIG.
When the reproduction of R6 is started, the optical pickup 2a reproduces the lead-in area 6b in the CD-R 6 in accordance with a command of the application software in the optical disk drive device 2 in step 3 of FIG. recorded recording time is within the standard recording time H _1.

Next, in step 4 of FIG. 5, the optical pickup 2a first reproduces the control data recorded in the program area 6c in the CD-R 6 according to a command of the application software.

Next, in step 5 of FIG. 5, the optical pickup 2a moves the C signal according to the signal track address at the beginning of the key data area 6d recorded in the control data.
The key data area (6d) in D-R6 is searched at high speed.

Next, in step 6 of FIG. 5, the optical pickup 2a moves the key data area (6d) in the CD-R6.
As described above with reference to FIG. 2B, when the optical disk 1 is reproduced in the normal reproduction order, the CD-R 6 copied via the hard disk 4
Key data area 6d recorded in the control data in c
Is different from the first signal track address of the key data area 6d previously assigned to the CD-R6, the optical pickup 2a cannot search the key data area 6d, and the reproduction of the CD-R6 is performed. Abort.

On the other hand, CD-R6 that it duplicates the entire optical disc 1 as described above with reference to FIG. 2 (C), to the key data area of the outer peripheral portion is not present in the standard recording time H ₁ outside the program area Since the key data area cannot be searched with the signal track address at the beginning of the key data area recorded in the control data in 6c, reproduction of the CD-R 6 is stopped.

Therefore, the CD-R 6 copied in the state shown in FIGS. 2B and 2C cannot reproduce any of the key data for duplication to be recorded in the key data area (6d). Since the program in the program area 6c permitted to be reproduced by the duplication key data cannot be reproduced, the duplication of the optical disc 1 to the CD-R 6 can be prevented.

In the embodiment, the optical disk 1 according to the present invention is used.
Is applied to a 12 cm diameter CD, CD-ROM, CD-I, etc., but the technical idea of the optical disk 1 according to the present invention can be applied to an 8 cm diameter, and two recently developed optical disks can be attached. The present invention is also applicable to a bonded optical disc for DVD.

[0042]

According to the method for preventing duplication of an optical disk and the optical disk according to the present invention described in detail above, the recording conditions of a large number of signal tracks are strictly kept within the allowable range of the standard value of the optical disk, and the large number of signal tracks are standardized. The recording time is extended to the outer peripheral portion of the optical disk outside the recording time, and
Outside the standard recording time, key data for preventing duplication is recorded in the key data area on the outer periphery, and control data to refer to the key data for preventing duplication is recorded in the program area where the program is recorded within the standard recording time. Then, when the optical disk is reproduced, the control data is read first, and then the duplication prevention key data is referred to based on the control data.
Since the reproduction of the program is permitted by the key data, when the optical disk according to the present invention is illegally copied to a CD-R (Recordable) as a write-once optical disk, a large number of signal tracks in the CD-R are recorded. Since the recording capacity is set within the standard recording time, the key data for preventing duplication from the optical disc cannot be copied to the key data area on the outer periphery outside the standard recording time. Since such programs cannot be reproduced, the optical disk according to the present invention does not need to be copied on CD-R in large quantities.

[Brief description of the drawings]

FIG. 1 is a plan view for explaining an optical disc according to the present invention.

FIGS. 2A to 2C show an optical disc according to the present invention;
It is a figure for explaining each CD-R which duplicated this optical disk.

FIG. 3 shows an optical disc according to the present invention,
FIG. 4 is a diagram for explaining a state in which data is reproduced by a drive device.

FIG. 4 is a diagram showing a state where an optical disk according to the present invention is copied to a CD-R.

FIG. 5 is an operation flowchart illustrating a method of preventing duplication of an optical disk according to the present invention.

6A and 6B are diagrams for explaining a conventional CD-ROM duplication preventing method.

[Explanation of symbols]

1. optical disk according to the present invention, 1b lead-in area,
1c: Program area, 1d: Key data area, 2: Optical disk drive device, 2a: Optical pickup, 6 ...
12 cm diameter CD-R, H ₁ as write-once optical disc
... standard recording time, H 2 _... extended recording time.

Claims (4)

[Claims] An optical disk duplication preventing method for preventing duplication of a program recorded along a number of signal tracks in an optical disk, wherein the recording conditions of the number of signal tracks are strictly kept within a permissible range of a standard value of the optical disk. Above, the plurality of signal tracks are formed by extending the recording time to the outer periphery of the optical disk outside the standard recording time, and the key data for preventing duplication is stored in the key data area of the outer periphery outside the standard recording time. And the control data for referring to the key data for preventing duplication is recorded in the program area where the program is recorded within the standard recording time, and the control data is read first when the optical disc is reproduced. After that, referring to the key data for preventing duplication based on the control data, the reproduction of the program is permitted by the key data. A method for preventing duplication of an optical disk. 2. The recording condition of the plurality of signal tracks, wherein one or both of a track pitch and a linear velocity of the signal tracks are set near a lower limit value within an allowable range of the standard value. The method for preventing duplication of an optical disk according to claim 1. 3. An optical disk for preventing duplication of a program recorded along a number of signal tracks in an optical disk, wherein the recording conditions of the number of signal tracks are strictly adhered to within an allowable range of a standard value of the optical disk. A number of signal tracks are formed by extending the recording time to the outer peripheral portion of the optical disk outside the standard recording time, and key data for preventing duplication is recorded in the key data area of the outer peripheral portion outside the standard recording time. An optical disc, wherein control data to be referred to the key data for preventing duplication is recorded in a program area where the program is recorded within a standard recording time. 4. A recording condition for said plurality of signal tracks, wherein one or both of a track pitch and a linear velocity of said signal tracks are set near a lower limit value within an allowable range of said standard value. The optical disc according to claim 3, wherein