JP2001076348A - Optical disk and optical disk device - Google Patents

Abstract

(57) [Problem] In a conventional write-once optical disc and recording / reproducing apparatus, a method is employed in which at least a CSS key information area in a control area is crushed in advance by a prewrite or embossed prepit to prevent illegal copying. However, the copy-once function that only one generation can be copied cannot be realized. SOLUTION: A main information area in which encrypted data information can be recorded in a recording layer of a groove provided with a wobble in a form that can be read through light, and a read located on an inner peripheral side of the main information area. A unique medium ID, which is a unique identifier for each disc, is recorded in advance in a groove of the lead-in area by a laser beam, and is configured in the control area or adjacent to the control area. A copy-once with high generational piracy prevention ability can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk and a recording / reproducing apparatus for an optical disk, and in particular, in order to protect a copyright from unauthorized duplication, recorded signals such as video and audio are encrypted and recorded. The present invention relates to a disc-shaped optical disk that has been used.

[0002]

2. Description of the Related Art Generally, movies and music are recorded (recorded).
In commercially available DVD-R discs, data information such as video and audio is encrypted and recorded in order to protect copyright from unauthorized duplication. And this DV
When playing a DR disc with a DVD playback device,
The VD playback device reads the key information recorded in the control area of the same DVD-R disc, decrypts the encrypted data information using the key information, and reconstructs the original video and audio. The reproduction is performed by this.

Hereinafter, such a conventional DVD-R disc and disc reproducing apparatus will be specifically described. Here, a DVD-R, which is one of the specific examples, will be described.

FIG. 5 is a perspective view showing a schematic structure of a conventional DVD-R disc. In FIG. 5, 1 is a DVD-
This is an R disk. Reference numeral 2 denotes a main information area of the DVD-R disc 1, and data information such as video and audio is
It is encrypted in the SS and recorded in the main information area 2. CSS stands for Contents Scrambling System and means a system for encrypting main data with identification information unique to the content. 3 is a lead-in area. A control area 4 in the lead-in area records disc management information including key information for decrypting data information recorded in the main information area 2. The control area 4 is located on the inner peripheral side of the DVD-R disc 1. In the DVD-R, a spiral groove having wobbles is formed from the inner peripheral portion to the outer peripheral portion over the area, and data information is recorded in this groove. Is previously recorded on the substrate.

FIG. 6 is a block diagram showing a schematic configuration of a conventional DVD reproducing apparatus. In FIG. 6, 1 is a DVD-
This is an R disk, which records video and audio data information to be reproduced. Reference numeral 4 denotes an optical pickup, which reads a recording signal of the DVD-R disc 1 using a laser beam. Reference numeral 5 denotes a transfer controller, which is a DVD-R disc 1
The optical pickup 4 is moved in the radial direction of the DVD-R disc 1 to read a recording signal at an arbitrary position above.
Reference numeral 6 denotes a disk motor for rotating the DVD-R disk 1. Reference numeral 7 denotes a first control circuit that controls the optical pickup 4, the transfer controller 5, and the disk motor 6. 8
Is an amplifier, which amplifies the signal read by the optical pickup 4. Reference numeral 9 denotes a second control circuit, which receives an output signal of the amplifier 8 and generates a servo signal such as a focus error signal and a tracking error signal necessary for reading the DVD-R disc 1 by the optical pickup 4 from this signal. And outputs it to the first control circuit 7. Further, the second control circuit 9 digitizes (binarizes) the input signal which is an analog signal. Reference numeral 10 denotes a demodulation circuit that analyzes a read signal from the digitized DVD-R disc 1 and reconstructs data information such as original video and music. Reference numeral 12 denotes a system control circuit which controls the entire DVD reproducing apparatus.

Hereinafter, the operation of the DVD reproducing apparatus thus configured will be described. When playing a commercially available DVD-R disc, the transfer controller 5 drives the first pickup control circuit 7 to move the optical pickup 4 to the inner peripheral portion of the DVD-R disc 1 in accordance with an instruction from the system control circuit 12. Move to The read signal of the optical pickup 4 is amplified by the amplifier 8, converted into a digital signal by the second control circuit 9, and the content is read by the demodulation circuit 10. The demodulation circuit 10 sends the result to the system control circuit 12. If the read content is not the CSS key information in the control area 24, the system control circuit 12 issues an instruction to the first control circuit 7 again, and By the drive of the control circuit 7, the transfer controller 5 further moves the optical pickup 4 inward to search for the CSS key information of the DVD-R disc 1.

By repeating such an operation, D
CSS key information recorded on the inner peripheral portion of the VD-R disc 1 is searched for, and the demodulation circuit 10 reads it. When the system control circuit 12 detects that the demodulation circuit 10 has read the CSS key information of the DVD-R disk 1, the first control circuit 7 drives the transfer controller 5 according to the instruction of the system control circuit 12, and the transport controller 5 The optical pickup 4 reads the recording signal of the main information area 2 of the DVD-R disc 1. Since this recording signal is generally encrypted by CSS, it does not become a normal video or audio signal when reproduced as it is, but the CSS recorded in the key information recording area 104 read out earlier
Using the key information, this code can be decrypted. Therefore, the demodulation circuit 10 uses the read CSS key information to decrypt the recording signal in the main information area 2 and reconstructs the original normal video and audio data.

However, in a recordable disc such as a DVD-R, a duplicate disc can be easily made by copying the control area. As a physical means for preventing this, there has been proposed a method of recording another signal in advance in the entire control area or in an area including at least CSS key information of the control area.

[0009] This is achieved by forming a pre-pit with different information in advance in a control area including a CSS key area of the disc by embossing or by pre-writing with a laser in advance to destroy a regular CSS key information section, This is a method for preventing key information from being reproduced.

[0010]

However, in such a conventional disk and its reproducing or recording system, there is a problem that a copy once, which is used for DVD-Audio, in which only one generation can be copied, cannot be performed.

In order to realize this, identification information (hereinafter, referred to as unique media ID information) unique to each disc is recorded on the disc, and the unique media ID is recorded.
A method of realizing copy once by encrypting main data using D has been proposed. This method uses a BCA located on the inner periphery from the lead-in area in the finished disk.
A method of recording a unique media ID by irradiating a (burst cutting area) area with a high-power laser such as a YAG laser, and recording the same signal at a density of less than several hundred tracks at a time in the data area. It is.

However, in a DVD-R disc, an R information area for recording power calibration and recording management exists in an inner peripheral portion from a lead-in area, and thus it is difficult to provide a BCA area. appear.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and a correct disk identification is performed without impairing the recording or reproduction of the disk management information, and a DVD-ROM with copyright infringement is incurred. It is an object of the present invention to provide an optical disk and an optical disk recording or reproducing apparatus which can effectively prevent illegal use of an R disk and other optical disks and easily realize copy once.

[0014]

SUMMARY OF THE INVENTION An optical disk and an optical disk recording or reproducing apparatus according to the present invention which have been made to solve the above-mentioned problems are as follows: (1) Reading from a recording layer of a groove provided with a wobble through light. A main information area in which encrypted data information can be recorded in a form capable of being read, and a lead-in area located on the inner peripheral side of the main information area. A write-once optical disc characterized by being recorded in advance by light, where the unique media ID information is identification information unique to each disc and key information for encrypting the data information in the main information area. Means

(2) The optical disk according to claim 1, wherein the unique media ID is recorded in advance at the same recording density as the main information area.

(3) CSS in the lead-in area
2. The optical disc according to claim 1, wherein the unique media ID information is recorded adjacent to a control area in which disc management information including key information for unlocking the disc is recorded.

(4) The optical disc according to any one of claims 1 to 3, wherein the area in which the unique media ID information is recorded is 3 ECC blocks or more.

(5) CSS in the lead-in area
2. The optical disc according to claim 1, wherein the unique media ID information is recorded in a control area in which disc management information including key information for unlocking the disc is recorded in advance.

(6) The optical disk according to claim 5, wherein unique media ID information is recorded in a key information area for deciphering CSS in the control area.

(7) The optical disk according to claim 5, wherein the area in which the unique media ID information is recorded is a sector unit.

(8) having a groove with wobbles,
Recording or reproduction for recording or reproducing the data information recorded on an optical disk having a main information area in which encrypted data information is recorded and a lead-in area in which unique media ID information is recorded in advance An apparatus for recording or reproducing an optical disk, characterized in that data is recorded / reproduced in / from a main information data area using a signal that has been encrypted / decrypted using the unique media ID information as key information.

(9) The recording / reproducing apparatus for an optical disk according to claim 8, wherein the optical disk is a write-once optical disk.

According to the optical disk and the optical disk recording or reproducing apparatus of the present invention, the unique media ID information is pre-written in advance in the lead-in area of the disk by a laser beam, separately from the key information for unraveling the CSS, so that the disk management information can be obtained. Provide a low-cost optical disc that can be correctly identified without impairing the copyright, can effectively prevent illegal use of DVD-R discs and other optical discs with copyright infringement, and can easily manage the implementation of copy once. Is what you do.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disk according to the present invention comprises a main information area in which main data is recorded on a track having wobbles, and a lead-in area on the inner peripheral side of the main information area. The identification information (unique media ID information) for performing encryption / decryption unique to each disk is previously recorded at the same density as the main data area by a laser beam. Recording adjacent to or in the control area can perform a function of managing one generation copy without using BCA, and performs R and R which performs power calibration and recording management on the inner circumference of the lead-in. This has the effect that an information area can be secured.

Further, in order to enhance the copyright protection function, the DVD recording type disc has at least a CSS in the control area.
A method of recording another information in advance in the key information area by embossing or prewriting is adopted. Therefore, when the entire control area is pre-written in advance, if the unique media ID information is adjacent to the control area, the two areas can be simultaneously recorded, and the pre-write can be performed in a short time without the need for seeking. Further, when unique media ID information is provided in the control area, pre-writing can be similarly performed in a short time without seeking.

The recording apparatus according to the present invention includes a pickup for reading a recording signal recorded on an optical disk in which data is recorded in a main information area and key information for decrypting the data is recorded in an inner lead-in area. A first control unit for moving the pickup to an arbitrary position in a radial direction of the optical disk so that data at an arbitrary position on the optical disk can be read; and a second control unit for performing a process of reproducing encrypted data in the optical disk. 2 control means, a determination means for identifying the control area and the unique media ID information area, a second determination means for identifying that the source signal is copy once, and recording the source signal by encrypting and structuring it A third control means for detecting wobble or detecting information pre-written in the control data area. It makes a determination of a write-once disks,
When the source signal allows copy once, the unique information ID is detected from the disk to be recorded, and it is used to perform encryption and record the encrypted data in the main information area. As a result, the key to decrypt the recorded data becomes unique for each disc,
In the case of copying the second and subsequent generations, it is not possible to copy even the key for decrypting the code, which has the effect of having a high copyright protection capability and realizing the copy once function.

A reproducing apparatus according to the present invention includes a pickup for reading a recording signal recorded on an optical disk in which data is recorded in a main information area and key information for decrypting data is recorded in an inner lead-in area. First control means for moving the pickup to an arbitrary position in the radial direction of the optical disc so that data at an arbitrary position on the optical disc can be read; determining means for identifying a control area and a unique media ID information area; It is provided with a second control means for decoding using a unique media ID. The wobble is detected or information pre-written in a control data area is detected to determine a write-once disc. Media I
It has a function of detecting D and performing decoding using the D to reproduce data recorded in the main information area. As a result, when only the main data is copied, the decryption key is different for each disk, so that the decryption cannot be performed, and the correct data can be prevented from being copied in the second generation.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

(Embodiment 1) FIG. 1 shows a DVD-ROM of the present invention.
FIG. 2 shows the structure of an R disk, and FIG. 2 is an enlarged view of a control area and a unique media information area formed by prewriting. 1 is a DVD-R disc, 2 is a main information area for recording encrypted data, 3 is a lead-in area, 24 is a control area for recording disc management information including key information for unlocking CSS, and 25 is a control area. This is a unique media ID information area.

FIG. 3 is a block diagram of a DVD recording apparatus according to the present invention. Reference numeral 1 denotes a DVD-R disc, in which a control area 24 for recording disc management information is pre-written in advance, and In order to protect the right, another information is recorded in advance at the position where the key information for unlocking the CSS is recorded. An optical pickup 4 reproduces and records a recording signal of the DVD-R disc 1 using a laser beam. Reference numeral 5 denotes a transfer controller for moving the optical pickup 4 in the radial direction of the DVD-R disc 1 in order to record or reproduce a signal at an arbitrary position on the DVD-R disc 1. A disk motor 6 rotates the DVD-R disk 1. Reference numeral 7 denotes a first control circuit for controlling the optical pickup 4, the transfer controller 5, and the disk motor 6.
Reference numeral 8 denotes an amplifier, which amplifies a signal read by the optical pickup 4. Reference numeral 9 denotes a second control circuit, to which an output signal of the amplifier 8 is inputted, and from this signal, a DVD
-Generates a servo signal such as a focus error signal and a tracking error signal necessary for reading the R disk 1 and outputs it to the first control circuit 7. The input signal is an analog signal, which is digitized (binarized). Reference numeral 10 denotes a demodulation circuit that analyzes a read signal from the digitalized DVD-R disc 1 and reconstructs data such as original video and music. Reference numeral 11 denotes a first detection circuit which detects an address signal or the like from a signal of the second control circuit 9 and outputs the detected signal to the system control circuit 12. The system control circuit 12 controls the entire DVD playback device. 13 is a modulation circuit,
14 is a third control circuit, and 15 is a second detection circuit.

The operation of the DVD-R disk and the recording / reproducing apparatus configured as described above will be described below. Control area 24 and main information area 2
When data is recorded on the DVD-R disk 1 provided with a DVD, the transport controller 5 first drives the optical pickup 4 by driving the first control circuit 7 in accordance with an instruction from the system control circuit 12.
The control area 24 on the inner periphery of the DR disc 1
Go to The read signal of the optical pickup 4 is supplied to an amplifier 8
The digital signal is amplified by the second control circuit 9 and is read by the demodulation circuit 10. The demodulation circuit 10 sends the result to the system control circuit 12. The system control circuit 12 decodes the disc identification, recording conditions and the like based on the disc management information read from the first information area, and shifts to the recording operation.

The copy-once permission information included in the source signal is detected by the second detection circuit 15. If the copy-once permission is permitted, the unique media ID information in the lead-in area 3 is read by the search and reproduction operation. The third control circuit 14 performs encryption by the read unique media ID and modulates the
The recording data is recorded in the main data area by the laser light output from the optical pickup 4 via the amplifier 8 using the signal obtained in step (1).

The operation when the DVD-R disc is reproduced by a reproducing apparatus will be described. System control circuit 1
The transfer controller 5 is driven by the driving of the first control circuit 7 in accordance with the instruction of 2
To move the optical pickup 4 to the unique media ID area 25 to read the recorded unique media ID. The first control circuit 7 and the transfer controller 5 are operated according to an instruction from the system control circuit 12 to send an optical pickup to a predetermined position in the main information area 2 and demodulate a signal obtained by reading a recording signal of the DVD-R disc 1. Correct reproduction data is output by decoding and reconstructing with the unique media ID in the circuit 10.

When the entire control area is constituted by prewrite or embossed prepits, the unique media ID information is prewritten as adjacent to the control area. As the unique media ID area, in consideration of reading by a recording device or a reproducing device and error correction,
It is preferable that the information of one block unit be composed of three or more blocks. Furthermore, in the unique media ID information,
The traceability function can be provided by including information such as an identifier for identifying a unique media ID, a maker name and a date of manufacture of the disc and prewrite. It is sufficient for the unique media ID to be 32 bytes or less, and more preferably, about 4 to 16 bytes. A buffer area may be provided between the control area and the unique media ID area. As an example of the buffer area, there is a dummy data composed of 40 blocks or less.

On the other hand, when only a part including the CSS key information of the control area is formed in advance by prewrite or emboss prepit, a unique media ID may be provided in the control area in sector units.
It is preferable to provide it in the key information area.

[0036]

As described above, the optical disc and the recording / reproducing apparatus for the optical disc according to the present invention provide the data information encrypted in a form which can be read out from the recording layer of the groove provided with the wobble through light. A write-once optical disc having a main information area capable of recording information, and a lead-in area located on an inner peripheral side of the main information area, wherein unique media ID information is recorded in advance in a groove of the lead-in area by laser light. Yes, R information that performs power calibration and recording management on the inner periphery of the lead-in by recording unique media ID information different from the key information for unlocking the CSS in the lead-in area at the same recording density as the main information area DVD-R with correct disc identification and copyright infringement without loss of area Disk can effectively prevent illegal use of the other optical disk, also has the effect that the copy-once function enhanced anti force of second generation copy can be easily realized. In addition, by forming a unique media ID area adjacent to or inside the control area, even in the case of prewriting, it is not necessary to seek and it is possible to record in a short time, and an effect that a low-cost optical disk can be obtained. Have.

[Brief description of the drawings]

FIG. 1 is a diagram showing a structure of a DVD-R disc according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a DVD-R disc.

FIG. 3 is a block diagram of a DVD recording device of the present invention.

FIG. 4 is a block diagram of a DVD playback device of the present invention.

FIG. 5 is a diagram showing the structure of a conventional DVD-R disc.

FIG. 6 is a block diagram showing a schematic configuration of a conventional DVD recording device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 DVD-R disc 2 Main recording area 3 Lead-in area 4 Optical pickup 5 Transfer controller 6 Disk motor 7 First control circuit 8 Amplifier 9 Second control circuit 10 Demodulation circuit 11 First detection circuit 12 System control circuit 13 Modulation circuit 14 Third control circuit 15 Second detection circuit 24 Control area 25 Unique media ID area

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) G11B 27/10 G11B 27/10 C (72) Inventor Yoshihiro Tozaki 1006 Kazuma, Kazuma, Kazuma, Osaka Matsushita Electric Industrial Incorporated F term (reference) 5D044 BC05 CC04 DE50 GK17 GL18 5D066 CA13 DA12 SA07 SB01 SC04 SF02 5D077 AA29 BA30 CA02 DC40 DF01 5D090 AA01 BB03 CC01 CC04 CC18 FF09 FF24 GG03 JJ11

Claims (9)

[Claims] 1. A main information area in which encrypted data information can be recorded in a recording layer of a groove provided with a wobble so as to be readable via light, and is located on an inner peripheral side of the main information area. A lead-in area is provided, and unique media ID information is recorded in advance in a groove of the lead-in area by laser light. The unique media ID information is identification information unique to each disc, and data information of the main information area is provided. An optical disc, which is key information for encrypting an optical disc. 2. The optical disk according to claim 1, wherein the unique media ID is recorded at the same recording density as a main information area. 3. The unique media ID information is recorded adjacent to a control area in which disc management information including key information for unlocking CSS in the lead-in area is recorded. An optical disc as described. 4. The optical disk according to claim 1, wherein the area in which the unique media ID information is recorded is 3 ECC blocks or more. 5. The unique media ID information according to claim 1, wherein the unique media ID information is recorded in a control area in which disc management information including key information for unlocking CSS in the lead-in area is recorded in advance. optical disk. 6. The optical disk according to claim 5, wherein unique media ID information is recorded in a key information area for deciphering CSS in the control area. 7. The area where the unique media ID information is recorded is in sector units.
Or the optical disk of 6. 8. An optical disk having a groove with wobbles and having a main information area in which encrypted data information is recorded and a lead-in area in which unique media ID information is recorded in advance. A recording or reproducing apparatus for recording or reproducing said data information, wherein said unique media ID information is encrypted / keyed as key information.
An optical disc device for recording / reproducing data in / from a main information data area using a decoded signal. 9. The optical disk device according to claim 8, wherein the optical disk is a write-once optical disk.