JP3169365B2 - optical disk - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc, and more particularly, to a disc-shaped optical disc in which recording signals such as video and audio are encrypted and recorded in order to protect a copyrighted work from unauthorized duplication. Things.

[0002]

2. Description of the Related Art Generally, movies and music are recorded (recorded).
In commercially available DVDs (Digital Versatile Disks), in order to protect copyrighted work from unauthorized duplication, that is, to protect copyright, data information such as video and audio is encrypted and recorded. I have. And DVD
Is played back by the DVD playback device, the DVD playback device reads the key information recorded in the control data area of the DVD, and decrypts the encrypted data information using the key information, The original video and audio are reconstructed and played.

Hereinafter, such conventional DVDs and DVDs will be described.
The playback device will be specifically described. In addition, here, DVD
A DVD-R (write-once DVD), which is one specific example, will be described. FIG. 4 is a perspective view showing a schematic structure of a conventional DVD-R. 4, reference numeral 101 denotes a DVD-R
Is shown. Reference numeral 102 denotes a main information area of the DVD-R 101. Data information such as video and audio is usually
The information is encrypted and recorded in the main information area 102. 10
Reference numeral 3 denotes a control data area. The control data area 103 records physical format information including key information for decrypting data information recorded in the main information area 102 and disc manufacturing information.
Note that the control data area 103 is a DVD-R1
01 is located on the inner peripheral side. This DVD-R
In 101, over both regions 102 and 103,
A spiral groove having wobbles is formed from the inner peripheral side to the outer peripheral side. Then, data information is recorded on the recording layer of the groove. Here, address information, disk recording conditions, and the like are recorded on the substrate in advance as pre-pits between grooves.

FIG. 5 is a block diagram showing a schematic configuration of a conventional DVD reproducing apparatus. In FIG. 5, reference numeral 101 denotes a DV.
D is shown. The DVD 101 records video and audio data information to be reproduced. Reference numeral 104 denotes an optical pickup. This optical pickup 104
Reads a recording signal of the DVD 101 using a laser beam. Reference numeral 105 denotes a transfer controller. The transfer controller 105 moves the optical pickup 104 in the radial direction of the DVD 101 to read a recording signal at an arbitrary position on the DVD 101. Reference numeral 106 denotes a disk motor. The disk motor 106 rotates the DVD 101.

Reference numeral 107 denotes a first control circuit. The first control circuit 107 controls the optical pickup 104, the transfer controller 105, and the disk motor 106.
Reference numeral 108 denotes an amplifier. The amplifier 108 amplifies the signal read by the optical pickup 104. 10
Reference numeral 9 denotes a second control circuit. The output signal of the amplifier 108 is input to the second control circuit 109. The second control circuit 109 generates a servo signal such as a focus error signal or a tracking error signal required when the optical pickup 104 reads a recording signal of the DVD 101 based on the signal, and converts the servo signal into a first signal. Output to the control circuit 107. Also, the second control circuit 109
Digitization (binarization) of input signals that are analog signals
I do.

Reference numeral 110 denotes a demodulation circuit. The demodulation circuit 110 analyzes the digitized signal read from the DVD 101 and reconstructs data information such as original video and music. Reference numeral 111 denotes a system control circuit. This system control circuit 111 has a DV
It controls the entire D playback device.

[0007] The operation of the DVD reproducing apparatus thus configured will be described below. When reproducing a commercially available DVD 101, first, the first control circuit 107 controls the drive of the transfer controller 105 according to the instruction of the system control circuit 111. As a result, the transfer controller 105 controls the optical pickup 1
04 is moved to a portion on the inner peripheral side of the DVD 101.
The signal read by the optical pickup 104 is amplified by the amplifier 108 and then digitized by the second control circuit 109. The demodulation circuit 110 reads the content of the digital signal and sends the result to the system control circuit 111. The system control circuit 111 stores the read content in the control data area 103 (see FIG. 4).
If it is not the key information, the instruction is issued again to the first control circuit 107, and the first control circuit 107 controls the drive of the transfer controller 105. As a result, the transfer controller 105 further moves the optical pickup 104 to a portion on the inner peripheral side of the DVD 101, and searches for key information of the DVD 101.

By repeating such an operation, D
Key information recorded in the control data area 103 located on the inner peripheral side of the VD 101 is searched for. Then, the demodulation circuit 110 reads this key information.
When the system control circuit 111 detects that the demodulation circuit 110 has read the key information of the DVD 101, the first control circuit 107 drives and controls the transfer controller 105 according to the instruction of the system control circuit 111. As a result, the transfer controller 105 moves the optical pickup 104 to a portion on the outer peripheral side of the DVD 101. And the optical pickup 1
04 is the main information area 102 of the DVD 101 (see FIG. 4)
Reads data information recorded in. Since this data information is generally encrypted, a normal video or audio signal cannot be obtained even if it is reproduced as it is.

However, this key can be decrypted by using the key information read out in the control data area 103 and read out earlier. Therefore, the demodulation circuit 110 uses the read key information to
Decrypts the data information and reconstructs the original normal video and audio data.

[0010]

SUMMARY OF THE INVENTION However, DVD
In a recordable optical disc such as -R or the like, even if the data information is encrypted in this way, if the information in the control data area is copied to the DVD-R together with the data information, a duplicate disc can be easily formed. There is. Therefore, in order to physically prevent such copying of information in the control data area, at least the DV
A method has been proposed in which another signal is recorded in advance in an area where the DR key information is to be recorded, and the key information is prevented from being copied to this area. This is DVD-
In the control data area including the area where the key information of R is to be recorded, a pre-pit with another information is formed in advance by forming an emboss, etc., and the normal key information is destroyed. This is a method of making it impossible to reproduce.

However, in such a conventional optical disc and its reproducing system or recording system, when data is recorded in the main information area 102, physical format information and disc manufacturing information which need to be post-written, such as the final address of the writing area, Information and the like cannot be recorded in the control data area 103. A DVD-R in which such physical format information and disc manufacturing information are not recorded in the control data area 103.
When 1 (optical disk) is reproduced by a DVD-ROM reproducing apparatus, there arises a problem that various useful functions, for example, a function of detecting and displaying the disk capacity in a short time are lost.

In addition, there is a problem that the responsiveness related to the recorded position information is deteriorated. Further, when recording pits are formed in advance in an area including key information of the control data area 103 with an emboss having a higher illegal use prevention power, it is extremely difficult to form a wobble in this area. For this reason, when this is reproduced by a DVD reproducing apparatus, there is no wobble in this area.
There is also a problem that the DVD-ROM may be erroneously determined in spite of -R.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problem, and it is intended to accurately record a disc without impairing a function of recording or reproducing physical format information and disc manufacturing information (disc management information). To provide an optical disc capable of identifying a disc and effectively preventing illegal use of a DVD or other optical disc that infringes copyright, and an apparatus and a method for recording or reproducing the optical disc. Aim.

[0014]

An optical disk according to a first aspect of the present invention, which has been made to solve the above-mentioned problems, comprises:
(I) a main information area in which encrypted data information can be recorded on a recording layer of a groove provided with a wobble in a form that can be read out via light; and (ii) (Iii) a second control data area located on the inner peripheral side of the main information area and (iii) a second control data area located on the inner peripheral side of the main information area and having information different from that of the first control data area. And (iv) recording, in the first control data area, physical format information including key information for decrypting data information, disc manufacturing information, and the like. Area is provided and the first
Another information is recorded in advance in an area in which at least key information can be recorded in the control data area of
(V) Physical format information not including key information, disk manufacturing information, and the like are recorded in the second control data area.

The optical disc according to the second aspect of the present invention comprises: (i) a recording layer of a groove provided with a wobble;
A main information area in which encrypted data information can be recorded in a form that can be read through light; and (ii) a first information area located on the inner peripheral side of the main information area. An optical disc comprising: a control data area; and (iii) a second control data area located on an inner peripheral side of the main information area and recording information with a physical structure different from that of the first control data area. , (Iv) physical format information and disc manufacturing information which do not include key information for decrypting data information are recorded in the second control data area.

In the optical disc according to the second aspect of the present invention, it is preferable that the physical structure is a wobble, the first control data area does not have a wobble, and the second control area has a wobble. .
In the optical disc according to the first or second aspect of the present invention, between the grooves in the second control data area, inter-groove pits recording information and the like including an address signal may be provided.

In the optical disc according to the first or second aspect of the present invention, the recording pits in the first control data area are formed by embossing, while the recording pits in the second control data area are formed by laser light. May be formed by writing using
As a specific example of the optical disk according to the first or second aspect of the present invention, there is, for example, a write-once optical disk.

The recording / reproducing apparatus for an optical disk according to the third aspect of the present invention comprises: (i) main information capable of recording encrypted data information on a recording layer of a groove having wobbles. An area; (ii) a first control data area in which physical format information including key information for decrypting data information and disc manufacturing information can be recorded; and (iii) a second control data area. (Iv) an optical disk recording and / or reproducing apparatus for recording and / or reproducing data information with respect to an optical disk provided with: It has a different structure from the control data area, and records or reproduces physical format information and disc manufacturing information, etc., that do not include key information in the second control data area. It is characterized by being made to live.

The recording / reproducing apparatus for an optical disk according to the fourth aspect of the present invention comprises: (i) main information capable of recording encrypted data information on a recording layer of a groove having wobbles. An area, (ii) a first control data area in which physical format information including key information for decrypting data information and disc manufacturing information can be recorded, and (iii) a second control data area. And (iv) an optical disc which records and / or reproduces data information on an optical disc having a structure of the first control data area and a structure of the second control data area different from each other. A recording / reproducing apparatus, comprising: (v) a physical format that does not include key information by using a second control data area at the time of recording or reproducing, respectively. It is characterized in that recording or reading of mat information and disc manufacturing information is performed.

In the optical disk recording / reproducing apparatus according to the third or fourth aspect of the present invention, the optical disk may be an optical disk in which information is recorded in advance in at least a part of the first control data area. Note that specific examples of the optical disk used in the optical disk recording / reproducing apparatus according to the third or fourth aspect of the present invention include:
An example is a write-once optical disk.

According to a fifth aspect of the present invention, there is provided a method for recording an optical disk, comprising: (i) a main information area capable of recording encrypted data information on a recording layer of a groove having wobbles; (Ii) a first control data area in which physical format information including key information for decrypting data information and disc manufacturing information can be recorded, and (iii) a second control data area. A recording method of an optical disc for recording data information on the optical disc, wherein (iv)
Detecting whether or not the loaded optical disc is recordable; and (v) when the optical disc is recordable, the second control data area includes physical format information and key manufacturing information without key information. Writing step.

In this optical disk recording method, whether or not the loaded optical disk is recordable may be detected based on the presence or absence of wobble. Optical disc according to the present invention, recording and / or
According to the recording / reproducing apparatus for reproducing or the recording method of the optical disk, the disk can be accurately identified without impairing the physical format information, the disk manufacturing information, and the like (disk management information). In addition, illegal use of DVDs and other optical discs with copyright infringement can be effectively prevented. Further, in the first control data area, it is possible to form recording pits in advance by embossing, which has a stronger illegal use prevention force and can be manufactured at lower cost. Therefore, an optical disk can be manufactured at low cost.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below. The optical disc according to the present invention includes a main information area in which data information (main data) is recorded on a track having wobbles, and first and second control data areas located on the inner peripheral side of the main information area. Have. Here, the first control data area and the second control data area
The information structure or the physical structure differs from the control data area. The first control data area has an area for recording physical format information including key information for decrypting data information, disk manufacturing information, and the like (disk management information). In addition, by forming another information in advance in at least an area of the first control data area where key information is recorded,
Alternatively, it has a function of protecting copyright by recording by writing with a laser beam.

Further, a second control data area for recording physical format information not including key information, disc manufacturing information, and the like is newly provided. Thus, in the second control data area, predetermined physical format information, disc manufacturing information, and the like, for example, a final address for writing, a maximum transfer rate, and the like can be recorded. When reproducing the optical disc using a DVD player or the like, the DVD player or the like is operated with good responsiveness by reading the physical format information and the disc manufacturing information in the second control data area. be able to.

Also, physical format information and disk manufacturing information, etc., which do not include key information, are recorded in the second control data area. At the time of reproduction of the optical disk, the information in the second control data area is read and the optical information is read based on the information. By operating the pickup, the copyright protection capability can be further enhanced. Here, by making the information structure of the second control data area different from the information structure of the first control data area, both control data areas can be easily and quickly identified. Further, if the physical structure of both areas is changed by forming the first control data area by embossing or the like, and forming the second control data area by forming pits between grooves, the two control data areas are formed. Can be easily identified. Reproduction or recording of physical format information such as disk identification conditions and disk recording conditions and disk manufacturing information and the like are performed in the second control data area having pits between grooves, thereby preventing erroneous recognition or malfunction of disk identification. can do.

A recording apparatus according to the present invention includes a pickup for reading a recording signal of an optical disk in which key information for recording data on the optical disk or decrypting the data is recorded in a portion on the inner peripheral side, and an optional optical disk. First control means for moving the pickup to an arbitrary position in the radial direction of the optical disc so that data can be read at the position, second control means for performing a process of reproducing encrypted data in the optical disc, Determining means for identifying the first control data area and the second control data area; and another means for encrypting and structuring the data and recording the data.
And two control means. This recording device is a DVD
The physical format information including the final address at the time of recording and the disc manufacturing information are recorded in at least the second control data area of -R in a structure different from that of the first control data area. Here, the determination means for identifying the first control data area and the second control data area may be wobble detection means for identifying both based on the presence or absence of wobble.

When recording is performed on an unrecorded optical disc for the first time, the above-described recording operation is performed as initialization, and the data structure such as physical format information and disc manufacturing information to be recorded in the second control data area is converted into key information. , The physical format information and the disc manufacturing information can be read using the second control data area at the time of subsequent recording or reproduction. A wobble detector for identifying the optical disk as a recordable optical disk; a protection mode determination unit to which a signal after the reproduction process is input; a disk determination unit to which a signal is input from the wobble detection unit; If the discrimination result does not match the disc determination result, the copyright protection function can be further enhanced by adding an output prohibiting means for prohibiting the reproduction or recording signal output from the DVD disc.

[0028] A reproducing apparatus according to the present invention has a pickup for reading a recording signal of an optical disk in which key information for decrypting data is recorded in a portion on the inner peripheral side, and a data reading device at any position on the optical disk. A first control means for moving the pickup to an arbitrary position in a radial direction of the optical disk, a second control means for reproducing encrypted data in the optical disk, and a first control data area. A determination unit is provided for identifying the second control data area. This playback device,
The physical format information and the disc manufacturing information of the second control data area are read based on the result of the determination means. A wobble detecting means for identifying whether or not the optical disc is a recordable optical disc; a protection manner determining means for receiving a signal after the reproduction process; a disc determining means for receiving a signal from the wobble detecting means; If the discrimination result and disc discrimination result do not match, the optical disc (DVD)
The copyright protection function can be strengthened by adding an output prohibiting unit for prohibiting the output of the reproduction signal from the PC.

Hereinafter, embodiments of the present invention will be described more specifically with reference to FIGS. FIG. 1 shows a schematic structure of a DVD-R according to the present invention. FIG.
FIG. 3 shows an enlarged view of a first control data area and a second control data area formed by embossing or the like of the DVD-R shown in FIG. In FIG. 1, 1
Indicates a DVD-R. Reference numeral 2 denotes a main information area in which encrypted data information is recorded. Reference numeral 3 denotes a first control data area for recording physical format information including key information for decrypting and disc manufacturing information. 15 is the first control data area 3
Is a second control data area for recording physical format information and disc manufacturing information having different structures.

In FIG. 2, reference numeral 3 denotes a first control data area. Reference numeral 14 denotes pits formed in the first control data area 3 by embossing. Reference numeral 15 denotes a second control data area. 16 indicates a groove, and 17 indicates the groove 16
The figure shows pits between grooves that record information such as addresses and disk recording conditions formed between them. In addition,
Reference numeral 18 denotes a wobble.

FIG. 3 is a block diagram of a DVD recording and reproducing apparatus according to the present invention. In FIG. 3, reference numeral 1 denotes a DVD. The DVD 1 has an embossed first control data area 3 (see FIG. 2) for recording physical format information and disc manufacturing information (disc management information). In the first control data area 3, in order to protect a copyrighted work from unauthorized duplication, that is, in order to protect copyright, another information is stored at a position where key information for decrypting the code is recorded. It is recorded in advance.

Reference numeral 4 denotes an optical pickup. The optical pickup 4 reproduces and records a recording signal of the DVD 1 using a laser beam. Reference numeral 5 denotes a transfer controller. The transfer controller 5 controls the optical pickup 4 to record or reproduce a signal at an arbitrary position on the DVD 1.
1 in the radial direction. Reference numeral 6 denotes a disk motor. This disk motor 6 rotates the DVD 1. Reference numeral 7 denotes a first control circuit. The first control circuit 7 controls the optical pickup 4, the transfer controller 5, and the disk motor 6. Reference numeral 8 denotes an amplifier. The amplifier 8 amplifies the signal read by the optical pickup 4. Reference numeral 9 denotes a second control circuit. The output signal of the amplifier 8 is input to the second control circuit 9. The second control circuit 9 generates a servo signal such as a focus error signal and a tracking error signal required when the optical pickup 4 reads the signal of the DVD 1 from the signal, and sends the servo signal to the first control circuit 7. Output. The signal input to the second control circuit 9 is an analog signal, and the second control circuit 9 digitizes (binarizes) the analog signal.

Reference numeral 10 denotes a demodulation circuit. The demodulation circuit 10 analyzes the digitized signal read from the DVD 1 and reconstructs data such as original video and music. Reference numeral 11 denotes a detection circuit. The detection circuit 11 detects an address signal or the like from a signal output from the second control circuit 9 and outputs the address signal or the like to the system control circuit 1.
Output to 2. The system control circuit 12 controls the entire DVD playback device. Reference numeral 13 denotes a modulation circuit.
The modulation circuit 13 modulates a recording signal (a signal or information to be recorded) and outputs it to the amplifier 8 during recording. This recording signal is recorded on the recordable DVD 1 by the laser beam output from the optical pickup 4.

Hereinafter, the DVD-R1 constructed as described above will be described.
And the operation of the recording / reproducing apparatus. Main information area 2
DVD having a control data area 3 and a first control data area 3
When recording data in R1, first, the system control circuit 1
The first control circuit 7 controls the drive of the transfer controller 5 in accordance with the instruction of (2). As a result, the transfer controller 5 moves the optical pickup 4 to the first control data area 3 located on the inner peripheral side of the DVD 1. The signal read by the optical pickup 4 is amplified by the amplifier 8 and digitized by the second control circuit 9. Then, the demodulation circuit 10 reads the contents of the signal digitized in this way, and outputs the result to the system control circuit 1.
Send to 2. The system control circuit 12 identifies the disk based on the physical format information and the disk manufacturing information (disk management information) read from the first control data area 3, decodes the recording conditions, and shifts to the recording operation.

The modulation circuit 13 modulates the encrypted recording signal (recording data). After the modulated recording signal is amplified by the amplifier 8, it is recorded in the main information area 2 of the DVD 1 by the laser light output from the optical pickup 4. After the recording, the first control circuit 7 drives and controls the transfer controller 5 according to the instruction of the system control circuit 12. As a result, the optical pickup 4 is moved to a position corresponding to the second control data area 15 on the inner peripheral side. Then, the optical pickup 4 records predetermined information in the recording signal (recording data), for example, the last address after recording. At that time, the physical format information and the disc manufacturing information of the first control data area 3 are recorded together. Here, the structures of the first control data area 3 and the second control data area 15 are different so that they can be easily identified.

Hereinafter, an operation when the DVD-R1 is reproduced by the recording / reproducing apparatus will be described. In this case, the first control circuit 7 drives and controls the transfer controller 5 according to the instruction of the system control circuit 12. As a result, the transfer controller 5 moves the optical pickup 4 to a position corresponding to the second control data area 15 (see FIG. 2). Then, the optical pickup 4 reads the physical format information and the disc manufacturing information recorded in the second control data area 15. Based on the information, the system control circuit 12 sends an instruction to the first control circuit 7. In accordance with an instruction from the system control circuit 12, the first control circuit 7 drives and controls the transfer controller 7. As a result, the transfer controller 5 moves the optical pickup 4 to a desired position in the main information area 2, and the optical pickup 4 reads a recording signal (data information) of the DVD 1. When data is additionally recorded on the DVD 1, the physical format information and the disc manufacturing information are similarly read from the second control data area 15. Then, the first control circuit 7 drives and controls the transfer controller 5 according to the instruction of the system control circuit 12. As a result, the optical pickup 4 is moved to a predetermined position, and data is additionally recorded.

In the DVD-R1, the first control data area 3 and the second control data area 15 are different in the structure of information to be recorded or the physical structure of the area. When the information structure is different, information is recorded in the second control data area 15 in a structure not including key information, or the physical format information and the disc manufacturing information are arranged in the first control data area. Information is recorded so as to be different from the arrangement of the area 3. As a result, the copyright protection function can be strengthened.
Discrimination between the VD-R1 and the DVD-ROM (read-only disc) is also facilitated.

On the other hand, both control data areas 3, 15
In the case where the physical structure is different, one of the first control data area 3 and the second control data area 15 has a structure including inter-groove pits 17,
Alternatively, by adopting a structure in which the wobble 18 is not formed, disc identification can be easily performed. In particular, the first control data area 3 is a DVD-ROM in which no inter-groove pits 17 or wobbles 18 are formed.
If the physical structure is the same as that of the (read-only disc) and the second control data area 15 has the original physical structure of the DVD-R, the first control data area 3 can be formed by embossing. For this reason, the copyright protection function in an unrecorded state can be strengthened, and the affinity with a reproduction-only device can be improved. When the physical structures are different, the line density, the track width, the physical depth of the pits and the like may be changed.

As described above, the optical disk, the optical disk recording / reproducing apparatus and the recording method according to the present invention have a high copyright protection capability and can operate the optical disk or the recording / reproducing apparatus with good responsiveness. Easy. An optical disc and an optical disc recording / reproducing apparatus and recording method according to the present invention can effectively prevent unauthorized copying of information recorded on an optical disc without impairing the function of the optical disc or the recording / reproducing apparatus. It is particularly suitable for use as a DVD or a recording / reproducing apparatus for the DVD.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic structure of a DVD-R according to the present invention.

FIG. 2 is an enlarged schematic diagram showing both control data areas of the DVD-R shown in FIG. 1;

FIG. 3 is a block diagram showing a schematic structure of a DVD recording / reproducing apparatus according to the present invention.

FIG. 4 is a perspective view showing a schematic structure of a conventional DVD-R.

FIG. 5 is a block diagram showing a schematic structure of a conventional DVD reproducing device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... DVD-R, 2 ... Main information area, 3 ... First control data area, 4 ... Optical pickup, 5 ... Transport controller, 6 ... Disk motor, 7 ... First control circuit, 8 ... Amplifier, 9 ... second control circuit, 10 ... demodulation circuit, 11 ... detection circuit, 12 ... system control circuit, 13 ... modulation circuit, 1
4: pits formed by embossing; 15: second control data area; 16: grooves; 17: pits between grooves; 18: wobbles.

Continuation of the front page (72) Inventor Shinichi Tanaka 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-2-50360 (JP, A) JP-A 8-153342 (JP) JP-A-9-81938 (JP, A) JP-A-9-274774 (JP, A) JP-A-5-120733 (JP, A) WO 00/7183 (WO, A1) (58) Survey Field (Int.Cl. ⁷ , DB name) G11B ^7/ 00-7/013 G11B 20/10 G11B 20/12

Claims (1)

(57) [Claims] 1. A main information area in which data information can be recorded on a recording layer of a groove provided with wobbles in a form that can be read through light, and a control data area located on an inner peripheral side of the main information area.
Data area, and a sub-information area. In the control data area, different information is recorded in advance in the same address area as an area containing decryption key information in a read-only disc . A recordable optical disc, wherein physical format information is stored in the information area with an information structure different from that of the control data area.