JP3293773B2 - Optical disk protection system and method, optical disk and reproducing apparatus used in the system - 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 disk protection system and method, an optical disk used in the system, and a reproducing apparatus.

[0002]

2. Description of the Related Art In a conventional optical disk system, all information is reproduced by detecting minute irregularities called pits with a laser beam. In addition, the write-once optical disk enables recording of information by irradiating a laser beam onto a recording thin film surface to form the pits.

[0003]

In the above-mentioned prior art, since the information is expressed by the same pit in both the read-only optical disk and the write-once optical disk, the information on the read-only optical disk is directly written on the write-once optical disk. And it is possible to easily produce a duplicate product.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has been made in consideration of the above-described problems. It is an object of the present invention to realize a protection system for a reproducing apparatus optical disk.

[0005]

According to the present invention, there is provided an optical disk protection system comprising: a specific data area which can be reproduced by a reproducing method using reflected light of a reproducing laser beam; and information recorded in the specific data area. Partial reproduction laser light
An optical disc having an ID recording section recorded in a cut-off mode, and light transmitted from the ID recording section to the ID recording section.
Optical processing device for reproducing recorded information from
And a playback device having a playback control means for playing back the optical disk only when the respective recorded contents match, and having a function of playing back each recorded content in the data area .

[0006]

[0007] Further, the ID recording section may be provided on the inner circumference of the recording surface of the optical disc.

[0008] Further, the ID recording section may be provided on the outer periphery of the optical disc.

[0009]

[0010]

The method for protecting an optical disk according to the present invention comprises:
A specific data area on the optical disk which can be reproduced by a reproduction method using reflected laser light for reproduction, and information recorded in the specific data area partially blocks the laser light for reproduction .
And an ID recording section recorded in a form as described above.
The recording information is reproduced from the light passing through the recording section , the recorded contents in the specific data area of the optical disk are reproduced, and the reproduction of the optical disk is performed only when the recorded contents match.

In this case, the recording information may be recorded in the ID recording section in such a manner that the recording information partially blocks the reproduction laser beam, and the recording information may be reproduced from the light passing through the ID recording section.

[0013] Further, the ID recording section may be provided on the inner circumference of the recording surface of the optical disc.

Further, the ID recording section may be provided on the outer periphery of the optical disc.

[0015]

[0016]

In any of the above optical disk protection methods, the information recorded in the ID recording section is recorded by encrypting the information recorded in the specific data area, and when the information is reproduced, the information recorded in the specific data area is recorded. May be encrypted, and the optical disk may be reproduced only when the information recorded in the ID recording unit matches the content recorded in the encrypted specific data area.

An optical disk according to the present invention has a specific data area which can be reproduced by a reproducing method using reflected laser light for reproduction, and information recorded in the specific data area is reproduced by reflected light of the laser light for reproduction. ID recording unit recorded by a recording method that cannot be reproduced by the method.

In this case, the recording information may be recorded in the ID recording section in such a manner as to partially block the reproduction laser beam.

Further, the ID recording section may be provided on the inner circumference of the recording surface of the optical disc.

Further, the ID recording section may be provided on the outer periphery of the optical disc.

In the reproducing apparatus according to the present invention, the specific data area which can be reproduced by the reproducing method using the reflected light of the reproducing laser light, and the information recorded in the specific data area is reflected by the reflected light of the reproducing laser light. For an optical disc having an ID recording section recorded by a recording method that cannot be reproduced by a reproducing method, a function of reproducing each recorded content in a specific data area of the optical disc and the ID recording section is provided. It has a reproduction control means for reproducing the optical disk only when the contents match.

[0023]

[0024]

[0025]

In any of the optical disks described above, the information recorded in the ID recording section may be such that the information recorded in the specific data area is encrypted.

In any of the reproducing apparatuses described above, the information recorded in the ID recording section is recorded with the information recorded in the specific data area being encrypted.
A means for encrypting information recorded in the specific data area,
The reproduction of the optical disk may be performed only when the information recorded in the ID recording unit matches the information recorded in the encrypted specific data area.

[Operation] In the present invention configured as described above, the specific data area which can be reproduced by the reproducing method using the reflected light of the reproducing laser beam, and the information recorded in the specific data area are recorded. The information recorded in the ID recording portion or the specific data area recorded by the recording method that cannot be reproduced by the reproduction method using the reflected laser beam for reproduction is recorded at a location that cannot be reproduced by the normal reproduction method. It is assumed that the optical disc has the ID recording unit and the reproducing device has a function of reproducing the recorded content of the ID recording unit, and performs reproduction only when the specific data area and the content of the ID recording unit match. In a write-once optical disc in which pits are formed at the recording position, an ID recording section cannot be formed, and it is difficult to make a copy using the write-once optical disc.

When the recorded contents of the ID recording section are encrypted, it is very difficult to construct a reproducing apparatus.

[0030]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the optical disk protection system according to the present invention, and shows the configuration of a reproducing apparatus for reproducing the contents recorded on the optical disk 2.

In this embodiment, an optical processing apparatus 1 comprising a light receiving device 11 and data conversion means 12 for converting optical information obtained by the light receiving device 11 into electric information by the data conversion means 12, and implements protection. Optical disk 2 on which ID information for recording is recorded, a CPU 3 for performing data processing and control of each section in the present embodiment, and a CPU 3 for storing information.
Together with a hard disk or RA
A storage device 4 such as an M, an optical pickup 7 for detecting the emission and reflection of laser light, and a control device 6 for physically controlling the optical disk 2 and the optical pickup 7.

The configuration of each section described above will be described.

The optical disc 2 includes a specific data area 21 which is an arbitrary data area starting from a predetermined sector,
An ID recording unit 22 is provided in an area different from the area where normal recording is performed.

The specific data area 21 is an area defined for creating ID information recorded in the ID recording section 22.
An area corresponding to a specific number of sectors from a sector at a specific address on the optical disk 2 is set. Further, the data stored in the specific data area 21 is not special data, and data of software recorded on the optical disc 2 may be used as it is. ID recorded in the ID recording unit 22
The information is data obtained by subjecting data stored in the specific data area 21 to encryption processing, and is recorded at the time of a press process for manufacturing the optical disc 2.

FIG. 2 is a top view showing the recording state of the ID recording section 22. As shown in the figure, the ID recording section 22 is an area having a width equal to or less than the diameter of the laser spot 24 and an arbitrary length. Is what is done. The hole 23 is sufficiently smaller than the laser spot 24 and has a physical structure through which the laser light 5 passes.
The ID recording unit 22 other than the hole 23 has a physical structure such that the laser beam 5 is blocked.

The light receiver 11 is installed corresponding to the position where the ID recording section 22 of the optical disc 2 is recorded, and receives the laser beam 5 emitted from the optical pickup 7.
Are arranged at positions where light can be received via the ID recording unit 22.

The data converter 12 digitizes the electric information from the light receiver 11 and outputs it to the CPU 3.

The CPU 3 comprises a control unit 31 and a receiving unit 3
2, a cipher generation unit 33, and a comparison unit 34.

The control means 31 controls the mechanical operation of the optical disk 2 and the optical pickup 7 by giving a command to the control device 6. The receiving means 32 receives digital information output from the optical processing device 1 and the optical pickup 7, stores the digital information in the ID storage unit 41 of the storage device 4 when receiving the ID information, and stores the ID information in the specific data area 21 when receiving the ID information. The data is output to the storage device 4 according to the type so as to be stored in the data storage unit 42.

The cipher generating means 33 is provided for the specific data area 21
After the reception of all the data of the ID storage unit 42, the data once stored in the data storage unit 42 is sequentially read out, the encryption processing is performed by the same method as when the data of the ID recording unit 22 is created, and the obtained encryption is stored in the encryption storage unit. 43.

When the encryption of the specific data area 21 is completed by the encryption generation unit 33, the comparison unit 34 sequentially stores the ID information stored in the ID storage unit 41 and the encryption information stored in the encryption storage unit 43. Read and collate. If all match, reproduction of the optical disk is subsequently performed by ordinary means. If not, an instruction is issued to the control means 31 to interrupt the reproduction.

The storage device 4 includes an ID storage unit 41, a data storage unit 42, and an encryption storage unit 43.

The ID storage section 41 stores the data of the ID recording section 22 received by the receiving section 32 and outputs the data to the comparing section 34.

The data storage section 42 stores the data of the specific data area 21 received by the receiving means 32 and outputs the data to the encryption generating means 33.

The encryption storage unit 43 stores the data output by the encryption generation unit 33 and outputs the data to the comparison unit 34.

The controller 6 controls the mechanical operation of the optical disk 2 and the optical pickup 7 in response to a command from the controller 31.

The optical pickup 7 detects the emission of the laser light 5 and the reflected light on the optical disk 2. The detected reflected light is digitized by an ordinary method, and
Output to 2.

Next, the operation of this embodiment will be described.

FIGS. 3 and 4 are flow charts showing the operation at the time of reproduction in this embodiment. FIG. 5 is a diagram showing the light receiving state of the ID recording section 22 in this embodiment. FIG. 6 is an ID recording section in this embodiment. FIG. 22 is a diagram showing a reproduction state of recorded contents of No. 22, and the operation of this embodiment will be described in detail with reference to FIGS.

When the reproducing operation is started, the optical pickup 7 is first moved as shown in FIG.
The upper ID recording section 22 is irradiated with the laser beam 5 so that the laser spot 24 covers the entire ID recording pitch. The laser beam 5 passes through the hole 23 if it exists, reaches the light receiving surface 52 of the light receiver 11, and reproduces the information of the ID recording unit 22 (step S1).

The light information on the light receiving surface 52 of the light receiver 11 is digitalized by setting the light intensity range of the region irradiated with the laser beam 5 through the hole 23 to “1” and setting the other to “0”. Be transformed into The light receiving surface of the light receiver 11 is two-dimensionally divided in units of the size of the hole 23, and in the case of digitization, the light intensity region is the light intensity region for each of the small regions divided in the order of rows and columns. Is determined (step S
2).

The converted data string reproduced by one laser spot is stored in the ID storage unit 41 (step S3). Thereafter, it is determined whether or not the reproduction of all data in the ID recording unit 22 has been completed (step S4). If the reproduction has not been completed, the process returns to step S1 and the above operation is repeated. The reproduction is similarly continued until the reproduction of the data is completed.

Next, the optical pickup 7 is moved, and the reproduction of the specific data area 21 on the optical disk 2 is performed by the same method as the normal optical disk reproduction (step S).
5) The data reproduced here is stored in the data storage unit 42. (Step S6) Thereafter, it is determined whether or not reproduction of all data in the specific data area 21 has been completed (Step S7). If not completed, the process returns to Step S5 to repeat the above operation, and The reproduction is similarly continued until the reproduction of the area 22 is completed.

Next, data is sequentially read from the data storage unit 42 (step S8), and encryption is performed in the same manner as when the data was created in the ID recording unit 22 (step S9). The encrypted data is stored in the encryption storage unit 43 (Step S10). Thereafter, it is determined whether or not all data in the data storage unit 42 has been encrypted (step S11).
If the processing has not been completed, the process returns to step S8 to repeat the above operation, and the encryption is similarly continued until the encryption of all the data in the specific data area stored in the data storage unit 42 is completed.

Next, the ID storage unit 41 and the encryption storage unit 4
3 is read (step S12).
A comparison is made to see if they match (step S13),
When the difference is detected even by one bit, the reproduction of the optical disk is immediately stopped (step S14). Step S13
If it is confirmed that the data read from each storage unit matches, then it is determined whether the comparison has been completed for all data in each storage unit (step S15), and the process ends. If not, the process returns to step S12 to repeat the above operation, and the comparison is continued in the same manner until the comparison for all data in each storage unit is completed.
When it is confirmed that the comparison has been completed for all data in each storage unit, the optical disk is recognized as a legitimate disk and reproduction is continued (step S16).

As described above, FIG.
FIG. 6 is a diagram showing a light receiving state in the D recording unit 22, and FIG. 6 is a diagram showing a reproducing state of the recorded contents of the ID recording unit 22 in the present embodiment.
FIG. 2 is a diagram showing an optical disc 2 provided with a recording unit 22. In order to clarify the operation and effect of the present embodiment, FIGS. 7 and 8 show a light receiving state and a reproducing state of the write-once optical disc 2 ′ in which the ID recording unit 22 whose reproduction is stopped is not provided. The difference when reproducing the copy medium by the write-once optical disc will be described below with reference to FIG.

The write-once optical disc 2 'shown in FIG.
This is a copy made by a commercially available write-once optical disc copying apparatus, and FIG. 7 shows a reproduced state similarly to FIG.

In the reproduction of the regular optical disk 2 shown in FIG. 5, the laser beam 5 passes through the hole 23 of the ID recording section 22 and reaches the light receiver 11. For example, the ID recording unit 2 in FIG.
Assuming that an area reproducible by one laser spot 24 is one block when a pattern such as pattern No. 2 is reproduced, the n-th block in FIG. The pattern represented by 63 is projected.
In the example shown in FIG. 6, since one laser spot is divided by three holes, information is represented by a 3 × 3 matrix.

The conversion matrix 62 is obtained by setting the high intensity area of the light receiving surface to “1” and converting the rest to “0”. Furthermore, by arranging them in the order of rows and columns, the conversion data string 64 is completed. The ID information 68 is obtained by arranging the converted data strings for each block in time series.

On the other hand, in a commercially available write-once optical disc copy apparatus used for producing the write-once optical disc 2 'shown in FIGS. 7 and 8, information is recorded by the presence or absence of pits 23' in the same manner as a normal optical disc. This is a representation, and it is not possible to duplicate a physical structure that is fine and transmits a laser beam like the hole 23. Therefore, FIG.
In FIG. 8, the laser beam 5 'is completely blocked at the disk surface and does not reach the photodetector 11'. As a result, the ID information 68 'is all "0" as shown in FIG.
Therefore, the comparison result of the data in step S13 shown in FIG. 4 does not match, and the data is not reproduced.

Next, a second embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 9 is a block diagram showing the configuration of the second embodiment of the present invention, and FIG.
FIG. 4 is a top view illustrating a recording state of No. 2;

Referring to FIG. 9, in the present embodiment, an optical processing apparatus 101 for converting optical information into electrical information and an optical disk 10 on which ID information for realizing protection are recorded.
2, a CPU 103 that performs data processing / control, a storage device 104 that stores information, and a mirror 105, a mirror 106, and a half mirror 108 that reflect laser light.
And an optical pickup 110 for detecting the emission and reflection of laser light, and a control device 9 for physically controlling the optical disk 102 and the optical pickup 110.

Unlike the first embodiment shown in FIG. 1, the photodetector 111 in this embodiment is placed horizontally, and receives the laser beam 107 traversing the optical disk 102 and passing through the ID recording section 122. The ID recording unit 122 is recorded on the side surface of the optical disc 102.

A part of the laser beam 107 emitted from the optical pickup 110 is reflected by the half mirror 108, turned back by the mirror 106 and the mirror 105, and irradiates the ID recording section 122 from the side of the optical disc 102.

The laser beam 107 turned back by the mirror 105 traverses the optical disk 102 and
ID recording unit 12 recorded on the side surface along the circumference of 2
2 and enters the light receiver 111. ID recording unit 122
The physical structure of the hole 206 formed in the first embodiment is the same as that of the first embodiment. Further, in this embodiment, the CPU 103 including the control unit 131, the receiving unit 132, the encryption generation unit 133, and the comparison unit 134, the storage device 104 including the ID storage unit 141, the data storage unit 142, and the encryption storage unit 143. The configuration and operation of each part of the optical processing device 101 and the like composed of the optical receiver 111 and the data conversion means 112 are similar to those of the control means 31 shown in FIG.
A CPU 3 including a receiving unit 32, a cryptographic generating unit 33, and a comparing unit 34; a storage device 4 including an ID storage unit 41, a data storage unit 42 and a cryptographic storage unit 43;
Since the configuration is the same as that of the optical processing device 1 including the light receiver 11 and the data conversion means 12, the description thereof will be omitted.

The present embodiment has an advantage over the embodiment of FIG. 1 in that it is not necessary to provide the ID recording section 122 on the optical disk surface. However, since the laser beam does not accurately irradiate the ID recording unit 122 due to the warp of the optical disk, and because the ID recording unit 122 exists on the side surface of the optical disk,
There are drawbacks in that ID information is easily degraded due to dirt and scratches and the amount of information is limited.

Next, a reference example of the present invention will be described in detail with reference to the drawings.

FIG. 11 is a block diagram showing a configuration of a reference example of the present invention, and FIG. 12 is a top view showing a recording state of an ID recording unit 312 in the reference example.

[0071] Referring to FIG. 11, this reference example, the optical disk 301 to which ID information is recorded for realizing the protection, the CPU302 to perform data processing / control, a storage device 303 for storing information, the laser beam Mirror 304, mirror 305, and mirror 306 that reflect light
And a control device 308 for physically controlling the optical disk 301 and the optical pickup 309, and an optical pickup 309 for detecting the emission of laser light and the detection of reflected light. Further, in the present embodiment, the control unit 32
1. CPU 302 including receiving means 322, encryption generating means 323, and comparing means 324, ID storage unit 33
1. The configuration and operation of each unit such as the storage device 303 including the data storage unit 332 and the encryption storage unit 333 are configured by the control unit 31, the reception unit 32, the encryption generation unit 33, and the comparison unit 34 illustrated in FIG. CPU 3, I
D storage unit 41, data storage unit 42, and encryption storage unit 43
Since these are the same as the storage device 4 composed of ID recording unit 312 in the present embodiment is different from the first embodiment shown in FIG. 1, is provided on the side surface of the optical disk 301. Also, as shown in FIG. 12, the ID recording section 312 records information by pits 406 instead of holes, and the laser light 307
The recorded information is reproduced not by the transmitted light but by the reflected light of the laser light 307.

A part of the laser beam 307 emitted from the optical pickup 309 is reflected by the half mirror 304, and passes through the mirror 306 and the mirror 305.
01 is illuminated.

The laser beam 30 reflected by the mirror 305
7 arrives at the ID recording section 312 recorded on the side surface along the circumference of the optical disc 301, is reflected there, returns to the optical pickup 309 in reverse to the time of incidence, and returns to the pit 406.
Is detected.

The operation of this embodiment is almost the same as the procedure shown in the flowcharts of FIGS.
The conversion of the optical information of the ID recording unit performed in step S3 is as follows.
Since the information has been changed to a pit representation, it is replaced by conforming to a normal optical disk reproducing method.

This embodiment has the advantage that the optical processing device is not required and the device configuration can be simplified as compared with the first embodiment. On the other hand, the disadvantage is that the ID information is easily deteriorated due to dirt flaws and the like because the ID recording portion is present on the side surface of the optical disk, and the amount of information is limited.

In each of the embodiments described above, I
Although the information recorded in the D recording unit has been described as the data recorded in the specific data area being encrypted,
The present invention focuses on recording in an ID recording unit by a method that cannot be reproduced by a normal optical disk reproduction method,
The encryption itself is not an essential requirement, and ordinary data may be recorded. By performing the encryption, the protection effect can be further enhanced. Further, the reproduction control means of the reproduction device includes means for decoding the information recorded in the ID recording section, and the optical disc is only used when the information recorded in the specific data area matches the recorded contents in the decoded ID recording section. The same protection effect as that of each embodiment can be obtained even when the reproduction is performed, and such a configuration may be adopted.

[0077]

Since the present invention is configured as described above, it has the following effects.

Since the ID information is recorded by a method which cannot be expressed by the write-once optical disc, and the ID information is confirmed and reproduced, it is not easy to copy the data onto the write-once optical disc. There is an effect that can be done.

When the ID information is created by encrypting software data, the ID information differs for each software recorded on the optical disc.
There is an effect that the above effect can be further improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of an optical disk protection system, and shows a configuration of a reproducing apparatus for reproducing contents recorded on an optical disk 2.

FIG. 2 is a top view showing a recording state of an ID recording unit 22 in FIG.

FIG. 3 is a flowchart showing an operation at the time of reproduction according to the first embodiment of the present invention.

FIG. 4 is a flowchart showing an operation at the time of reproduction according to the first embodiment of the present invention.

FIG. 5 is an ID recording unit 22 according to the first embodiment of the present invention.
FIG. 4 is a diagram showing a light receiving state in FIG.

FIG. 6 shows an ID recording unit 22 according to the first embodiment of the present invention.
FIG. 4 is a diagram showing a reproduction state of the recorded content of FIG.

FIG. 7 is a diagram illustrating a light receiving state of a write-once optical disc 2 ′ as a comparative example.

FIG. 8 is a diagram illustrating a reproduction state of a write-once optical disc 2 ′ as a comparative example.

FIG. 9 is a block diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 10 shows an ID recording unit 12 in the embodiment shown in FIG.
FIG. 4 is a top view illustrating a recording state of No. 2;

FIG. 11 is a block diagram showing a configuration of a reference example of the present invention.

12 is an ID recording unit 3 in the reference example shown in FIG.
FIG. 12 is a top view showing a recording state of No. 12;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 optical processing device 2 optical disk 3 CPU 4 storage device 5 laser light 6 control device 7 optical pickup 9 ID recording unit 11 light receiver 12 data conversion unit 21 specific data area 22 ID recording unit 23 hole 24 laser spot 31 control unit 32 reception unit 33 encryption generation means 34 comparison means 41 ID storage part 42 data storage part 43 encryption storage part 52 light receiving surface S1 to S14

Continuation of the front page (56) References JP-A-8-273164 (JP, A) JP-A-8-115559 (JP, A) JP-A-10-106041 (JP, A) JP-A-9-312039 (JP) , A) Mitsuaki Oshima et al., BCA, an individual information recording technology for DVD ROM discs, National Technical (58) Fields investigated (Int. Cl. ⁷ , DB name) G11B 20/10 G11B 19/02 G11B 7 / 00

Claims (17)

(57) [Claims] 1. A specific data area that can be reproduced by a reproduction method using reflected laser light for reproduction, and information recorded in the specific data area partially blocks the reproduction laser light .
An optical disc having an ID recording section recorded in a manner as described above, and information recorded on the ID recording section from light passing through the ID recording section.
An optical processing device that reproduces an optical disc, and a reproduction device that has a function of reproducing each recorded content in a specific data area and has a reproduction control unit that reproduces the optical disc only when each recorded content matches. Protection system. 2. The optical disk protection system according to claim 1, wherein the ID recording unit is provided on an inner peripheral portion of a recording surface of the optical disk. 3. The optical disk protection system according to claim 1, wherein the ID recording unit is provided on an outer peripheral portion of the optical disk. 4. The method of claim 1 or an optical disk protection system according to claim 3, recorded information on the ID recording unit recording information is recorded is encrypted to a specific data area, reproduction The reproduction control means of the apparatus includes means for encrypting the information recorded in the specific data area, and reproduces the optical disk only when the information recorded in the ID recording unit matches the content recorded in the encrypted specific data area. An optical disk protection system characterized by: 5. The optical disk protection system according to claim 1, wherein information recorded in an ID recording section is recorded by encrypting information recorded in a specific data area. The playback control means of the apparatus includes means for decoding the information recorded in the ID recording section, and reproduces the optical disk only when the information recorded in the specific data area matches the content recorded in the decoded ID recording section. An optical disk protection system characterized by: 6. A specific data area which can be reproduced by a reproducing method using reflected laser light for reproduction on an optical disk, and information recorded in the specific data area includes a reproduction laser light .
Providing an ID recording section recorded in a partially blocked form , reproducing recorded information from light passing through the ID recording section,
A method for protecting an optical disk, characterized in that contents recorded in a specific data area of the optical disk are reproduced, and reproduction of the optical disk is performed only when the recorded contents match. 7. The method for protecting an optical disk according to claim 6, wherein an ID recording section is provided on an inner peripheral portion of a recording surface of the optical disk. 8. The method for protecting an optical disk according to claim 6, wherein the ID recording section is provided on an outer peripheral portion of the optical disk. 9. The optical disc protection method according to any one of claims 6 to 8, the recording information of the recorded information to the ID recording unit to a specific data area performs recording by encrypting, when the reproduction Recording information in a specific data area, and reproducing the optical disk only when the information recorded in the ID recording unit and the content recorded in the encrypted specific data area match. Protection method. 10. The optical disk of protection method according to any one of claims 6 to 8, the recording information of the recorded information to the ID recording unit to a specific data area performs recording by encrypting, when the reproduction Is characterized in that the information recorded in the ID recording section is decoded, and the optical disc is reproduced only when the information recorded in the specific data area matches the content recorded in the decoded ID recording section. Protection method. 11. A specific data area that is capable of reproducing the reproduction method by the reflected light of the reproducing laser beam, the recording information blocks the reproduction laser beam in part batchwise to the specific data area
An optical disc comprising an ID recording section recorded in a form as described below . 12. A specific data area which can be reproduced by a reproduction method using reflected laser light for reproduction, and information recorded in the specific data area partially blocks the reproduction laser light.
The optical disc comprising an ID recording unit recorded in the form of, the ID recording unit from passing light of the ID recording unit
A reproduction apparatus having a function of reproducing information recorded on a disc and a function of reproducing contents recorded in a specific data area of the optical disk, and having a reproduction control means for reproducing the optical disk only when the respective recorded contents match. 13. The optical disc according to claim 11 , wherein the ID recording section is provided on an inner peripheral portion of a recording surface of the optical disc. 14. The optical disk according to claim 11 , wherein the ID recording section is provided on an outer peripheral portion of the optical disk. 15. The optical disk according to claim 11 , wherein information recorded in the ID recording section is recorded by encrypting information recorded in a specific data area. optical disk. 16. The reproduction apparatus according to claim 12 , wherein the recording information in the ID recording section is recorded by encrypting the recording information in the specific data area, and the reproduction control means controls the reproduction in the specific data area. It has a means for encrypting recorded information, and has an ID
A reproduction apparatus that reproduces an optical disk only when recording information in a recording unit matches recording contents in an encrypted specific data area. 17. The reproducing apparatus according to claim 12 , wherein the recording information in the ID recording section is recorded with the recording information in a specific data area being encrypted, and the reproduction control means includes:
A reproducing device comprising means for decoding information recorded in a recording unit, and reproducing an optical disk only when the information recorded in a specific data area matches the content recorded in the decoded ID recording unit. .