JP2004185767A - Data recording apparatus, optical disk, optical disk apparatus, encryption recording method, and encryption reproduction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit illegitimate copying without disturbing reproduction of an existing reproducing apparatus at all. <P>SOLUTION: Encryption data 5 to limit copying of data are recorded by generating pits and lands or marks and spaces so that the timing of edges of the pits and lands or the timing of edges of the marks and spaces detected at reproduction is changed in units of a reference period within a range wherein the data can correctly be reproduced. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a data recording device, an optical disk, an optical disk device, an encryption recording method, and an encryption reproduction method, and can be applied to, for example, a compact disk (Compact Disc) and a CD-ROM (Compact Disc Read Only Memory). According to the present invention, the pits and lands are detected such that the timing of the edges of pits and lands detected at the time of reproduction or the timing of the edges of marks and spaces is changed in units of a reference period within a range in which data can be correctly reproduced. Alternatively, by creating a mark and a space and recording encrypted data that restricts data copying, illegal copying can be prohibited without any hindrance to playback on an existing playback device.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a compact disk, after an error correction code is added to data to be recorded and interleaved, an EFM modulation (Eight to Fourteen Modulation) is further performed by adding an error correction code, and a synchronization signal and the like are added and recorded. It has been made to be.
[0003]
For such optical discs such as compact discs, various methods have been proposed as methods for preventing illegal copying. For example, in Japanese Patent Application Laid-Open No. 2002-197810, a digital sum value (DSV) is changed. Then, a method of recording the additional information has been proposed.
[Patent Document 1]
JP 2002-197810 A
[0004]
[Problems to be solved by the invention]
By the way, in such a method for preventing illegal copying, when applied to an existing optical disc, it is required to prohibit illegal copying without any hindrance to reproduction by an existing reproducing apparatus.
[0005]
The present invention has been made in consideration of the above points, and a data recording device, an optical disk, an optical disk device, an encryption recording method, and an encryption reproduction method capable of prohibiting an illegal copy without any hindrance to reproduction in an existing reproduction device. It tries to propose a method.
[0006]
[Means for Solving the Problems]
In order to solve this problem, according to the invention of claim 1, a data recording apparatus for sequentially creating pits and lands or marks and spaces with a length corresponding to an integral multiple of a predetermined reference period and recording desired data on an optical disc. In the range where the data can be correctly reproduced, the timing of the edge of the pit and the land detected at the time of reproduction or the timing of the edge of the mark and the space is changed in a unit of the reference period, so that the timing of the pit and the edge is changed. A land or a mark and a space are created, and encrypted data for restricting copying of data is recorded.
[0007]
Further, in the invention according to claim 7, pits and lands or marks and spaces are sequentially created with a length corresponding to an integral multiple of a predetermined reference period, and the method is applied to an optical disk on which desired data is recorded, and data is written. Create pits and lands or marks and spaces so that the timing of the edges of pits and lands detected during playback or the timing of the edges of marks and spaces changes in units of the reference period within the range that can be correctly reproduced. Then, encrypted data for restricting copying of data is recorded.
[0008]
According to the eleventh aspect, the present invention is applied to an optical disk apparatus for reproducing an optical disk on which desired data is recorded by sequentially forming pits and lands or marks and spaces with a length corresponding to an integral multiple of a predetermined reference period. Then, the timing of the edges of the pits and lands or the timing of the edges of the marks and spaces is determined, and the encrypted data that restricts copying of the data is reproduced. Based on the reproduction result, the reproduction and / or output of the data is performed. Restrict.
[0009]
In the twelfth aspect of the present invention, the pit and land detected at the time of reproduction are applied in units of a reference cycle within a range in which data can be correctly reproduced by applying to a cryptographic recording method for recording a desired code on an optical disk. A pit and a land or a mark and a space are created so as to change the timing of the edge of the mark or the edge of the mark and the space, and the code is recorded.
[0010]
According to the invention of claim 13, the cipher is reproduced by applying the cipher reproducing method for reproducing the cipher recorded on the optical disk, determining the timing of the edge of the pit and the land, or the timing of the edge of the mark and the space. I do.
[0011]
According to the configuration of claim 1, pits and lands or marks and spaces are sequentially created with a length corresponding to an integral multiple of a predetermined reference period, and the data is applied to a data recording device that records desired data on an optical disc. Create pits and lands or marks and spaces so that the timing of the edges of pits and lands detected during playback or the timing of the edges of marks and spaces changes in units of the reference period within the range that can be correctly reproduced. Then, when encryption data for restricting copying of data is recorded, such a change in the timing of the edge is processed by the processing at the time of reproduction in the same manner as when the timing does not change at all. Encrypted data can be recorded without any hindrance to playback on existing playback devices. It is possible to prohibit the illegal copy by.
[0012]
Thus, according to the configuration of claim 7, claim 11, claim 12, or claim 13, an optical disk capable of prohibiting illegal copying without any hindrance to reproduction in an existing reproducing apparatus, and an optical disk for reproducing this optical disk Apparatus, an encryption recording method and an encryption reproducing method for these optical disk devices can be provided.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
[0014]
(1) First embodiment
(1-1) Configuration of First Embodiment
FIG. 1 is a block diagram showing a configuration of a master disc producing apparatus according to a first embodiment of the present invention. The disc master making apparatus 1 exposes the glass master 2 by irradiating a laser beam to a glass master 2 having a surface coated with a resist. In the optical disk manufacturing process, after developing the glass master 2 to create a mother disk, a stamper is created from the mother disk, and a compact disk is created using the stamper.
[0015]
In this master disc producing apparatus 1, a formatter 3 receives data to be recorded via an optical disc 4 or the like, and converts a modulated signal S1 having a signal level switched corresponding to a pit string to be produced on a compact disc from the data. Generate. Here, the data to be used for recording is the original data (hereinafter, referred to as main data) to be recorded on a compact disk by a pit string, and includes audio data, TOC (Table Of Contents), and data used for generating a subcode. It consists of.
[0016]
In the process of generating the modulated signal S1, the formatter 3 records a copy protection key 5 by encryption on a compact disk, and controls copying of main data by digital output using the copy protection key 5. I have.
[0017]
That is, in the formatter 3, the information reproducing unit 6 reproduces the optical disk 4 and sequentially outputs main data. The EFM signal generation circuit 7 blocks the audio data based on the main data output from the information reproducing unit 6 in units of a predetermined data amount, adds an error correction code, performs an interleaving process, and further adds an error correction code. The EFM signal generation circuit 7 performs EFM modulation of the main data and the error correction code processed as described above, and then outputs the data as a serial data sequence synchronized with the channel clock through a synchronization signal. At this time, the EFM signal generation circuit 7 generates TOC data and subcode data, processes the TOC data in the same manner in place of audio data, and inserts the subcode data into audio data as appropriate. To process.
[0018]
FIG. 2 is a chart showing the sub-coding frame format generated in this way. As a result, the EFM signal generation circuit 7 sets the 588 channel bits to which the synchronization signal (frame synchronization) is allocated to one frame, and processes the main data in units of 98 subframes. ing. Thus, the EFM signal generation circuit 7 generates an EFM modulation signal EFM, and the formatter 3 modulates the EFM modulation signal EFM by NRZI (Non Return to Zero Inverted) and switches the signal level corresponding to the pit train. The signal S1 is generated.
[0019]
As shown in FIG. 3, the synchronization signal replacement circuit 8 adds an error detection code (EDC: Error Detection Code) and an error correction code (ECC: Error Correcting Code) to the copy protection key 5, and then adds the copy protection key 5. , An error detection code and an error correction code are sequentially converted into a serial data string (hereinafter, referred to as a key data string) in a predetermined order. The synchronization signal replacement circuit 8 replaces the synchronization signal included in the output data of the EFM signal generation circuit 7 according to the key data string for a predetermined period.
[0020]
Here, according to the standard, the synchronization signal is constituted by a 24-bit synchronization pattern as shown in FIG. 4 (A). In this embodiment, the EFM modulation signal EFM based on this synchronization pattern is NRZI-modulated. As shown in FIG. 4 (B1) or (B2), the modulation signal S1 is generated such that the pits and the lands are continuous at a period 11T with respect to the period T of the pit creation reference. Thereby, in the formatter 3, the EFM modulation signal EFM based on the synchronization pattern shown in FIG.
[0021]
The synchronization signal replacement circuit 8 monitors the EFM modulation signal EFM output from the EFM signal generation circuit 7 during a period corresponding to a predetermined area of the compact disc, and detects a synchronization signal included in the EFM modulation signal EFM. The predetermined area is an area set in advance, for example, a U-TOC area, a head area of a program area, and the like. By detecting such a synchronization signal, the synchronization signal replacement circuit 8 detects the synchronization signal of the first frame of the sub-coding frame, and replaces the synchronization signal of the first frame according to the key data sequence (FIG. 4E). .
[0022]
The synchronization signal replacement circuit 8 replaces the synchronization signal so as to change the position of the edge in the longitudinal direction in the pit or land corresponding to the synchronization signal detected in this way, according to the key data string. That is, as shown in FIGS. 4C and 4F, when the key data string D2 is logic 0, the synchronization signal replacement circuit 8 does not replace the synchronization signal at all, whereas the key data string D2 is logic 1 In this case, the synchronizing signal is replaced so that the rising edge to the logic 1 at the end becomes earlier by one channel clock cycle. Thus, in this case, as shown in FIGS. 4D1 and 4D2, after the pits are formed at the period 11T, the lands are formed at the period 10T, or after the lands are formed at the period 11T. , The synchronization signal is replaced so that the pit is formed at a period of 10T, and the position of the scanning end edge of the land or the pit is changed.
[0023]
The synchronizing signal replacement circuit 8 performs such replacement of the synchronizing signal by repeatedly using the key data string D2, whereby the key data string D2 is repeatedly recorded on the compact disc, and the copy protection key 5 can be reliably reproduced. To do.
[0024]
Thus, in the formatter 3, the subsequent EFM signal output circuit 9 performs NRZI modulation on the EFM modulated signal EFM1 output from the EFM signal generation circuit 7, and outputs the resulting signal to the cutting machine 10.
[0025]
The cutting machine 10 irradiates a laser beam onto the disk master 2 and drives the disk master 2 to rotate under the condition of a constant linear velocity while sequentially changing the irradiation position of the laser beam from the inner circumference side to the outer circumference side of the disk master 2. I do. At this time, the cutting machine 10 controls the laser drive circuit 11 to turn on and off the laser beam irradiated on the master disc 2 by the modulation signal S1 output from the formatter 3. Thus, the cutting machine 10 sequentially creates an exposure trajectory corresponding to the modulation signal S1 on the master disc 2, and forms a pit array on a compact disc based on the exposure trajectory.
[0026]
FIG. 5 is a block diagram showing a compact disc player according to the compact disc 20 created from the master disc 2. In the compact disc player 21, the optical pickup 22 irradiates the compact disc 20 with a laser beam and receives its return light, whereby a reproduction signal whose signal level changes in accordance with a pit row created on the compact disc 20 is formed. Outputs RF. The optical pickup 22 can be moved in the radial direction of the compact disc 20 by a servo circuit (not shown), so that the optical pickup 22 can seek under the control of the system controller 23. The servo circuit performs tracking control and focus control. It has been made.
[0027]
The CD signal processing section 24 processes the reproduction signal RF and reproduces audio data and the like recorded on the compact disc 20. That is, the CD signal processing unit 24 reproduces the channel clock from the reproduction signal RF, and reproduces the EFM modulated signal EFM1 by binary-identifying the reproduction signal RF using the channel clock. The CD signal processing unit 24 detects a synchronization signal from the EFM modulation signal EFM1 by the sync decoder 24A, and processes the EFM modulation signal EFM1 corresponding to the processing at the time of recording based on the timing of the detection of the synchronization signal. , Subcodes and audio data.
[0028]
The CD signal processing unit 24 performs an analog-to-digital conversion process on the audio data obtained as described above to generate an audio signal SA based on an analog signal, and outputs the audio signal SA to an external device. Thus, the compact disc player 21 can enjoy music recorded on the compact disc 20. Also, under the control of the system controller 23, the audio data is output through a predetermined interface, so that the music recorded on the compact disc 20 can be copied by digital output.
[0029]
In these processes, when one sync signal is detected from the EFM modulated signal EFM1, the sync decoder 24A detects a subsequent sync signal based on the timing at which the sync signal is detected, and detects an error in the sync signal. To correct the error. Thus, the compact disc player 21 can reliably reproduce the audio data recorded on the compact disc 20 even if the compact disc 20 is damaged, for example, or even if the reproduction signal RF has a large jitter. .
[0030]
When an error in the synchronization signal is detected in the synchronization signal detection processing, the sync decoder 24A raises an error detection flag F, and notifies the encryption decoder 25 of this error, as shown in FIG. .
[0031]
Under the control of the system controller 23, the encryption decoder 25 acquires the key data sequence D2 by taking in the error detection flag at a predetermined cycle, and prevents copy by using the error detection code and the error correction code set in the key data sequence D2. The key 5 is subjected to error correction processing. The encryption decoder 25 repeats these detection processes for the copy protection key 5 repeatedly recorded on the compact disc 20 and notifies the system controller 23 of the detected copy protection key 5 together with the error correction processing result.
[0032]
The system controller 23 is a computer for controlling the operation of the compact disk player 21. When the compact disk 20 is loaded, the system controller 23 executes a process such as a focus search under the control of a servo circuit, and then stores a key data string D2 in the recording area. The optical pickup 22 is caused to seek to the area set to. Subsequently, the entire operation is controlled so that the copy protection key 5 is reproduced from this area, and the copy protection key 5 and the error correction processing result are obtained from the encryption decoder 25.
[0033]
The system controller 23 compares and determines the plurality of copy protection keys 5 thus obtained and the error correction processing result. The system controller 23 terminates a series of processing when the compact disc 20 is loaded by comparing and judging the copy protection key 5, and reproduces music recorded on the compact disc 20 according to a subsequent user's instruction. In accordance with the determination result of 5, the output of the audio data DA from the CD signal processing unit 24 due to the reproduction of the music is stopped and controlled.
[0034]
FIG. 6 is a flowchart showing a processing procedure for the copy protection key 5 in the compact disc player 21. When the compact disk player 21 is loaded with the compact disk 20 and completes processing such as focus search, the process proceeds from step SP1 to step SP2, where a sync signal error is detected by the sync decoder 24A, and a sync signal error is detected. Then, the process proceeds from step SP2 to step SP3, and raises the error detection flag F. If no error is detected, the process proceeds from step SP2 to step SP4, and the error detection flag F is maintained in a falling state.
[0035]
When the compact disk player 21 completes the processing of the error detection flag F by the sync decoder 24A for the key data string D2, in step SP5, the encryption decoder 25 sets the error detection code and the copy protection key 5 by the error correction code. Process and notify system controller 23. In the following step SP6, the system controller 23 determines whether or not the copy protection key 5 is correctly recorded on the compact disc 20 based on the error correction processing result in the encryption decoder 25. If a negative result is obtained here, The process moves from SP6 to step SP7 and ends this processing procedure. On the other hand, if a positive result is obtained in step SP6, the process shifts from step SP6 to step SP8 to determine the copy protection key 5, and then shifts to step SP7 to end this processing procedure.
[0036]
(1-1) Operation of First Embodiment
In the above-described configuration, in this embodiment, in the disc master disc producing apparatus 1, the disc master 2 is sequentially exposed to form a latent image by a pit row, and the disc master 2 is developed to create a master disc. A stamper and a compact disk 20 are sequentially created from the master disk.
[0037]
In the exposure in the master disc producing apparatus 1, the EFM signal generation circuit 7 generates an EFM modulation signal EFM based on the cycle of the channel clock from the data provided by the optical disc 4 or the like, and this EFM modulation signal EFM is generated. The EFM signal output circuit 9 performs NRZI modulation, thereby generating a modulation signal S1 whose signal level changes in accordance with a pit sequence created on the compact disc 20. The modulation signal S1 is turned on and off according to the modulation signal S1. By irradiation, a latent image is formed on the master disk 2 by pit rows.
[0038]
Thus, in the master disc producing apparatus 1, pits and lands are sequentially created with a length corresponding to an integral multiple of the reference cycle by the channel clock, and data provided from the optical disc 4 is recorded on the disc master 2, which is an optical disc. . In the compact disk 20 reproduced from the master disk 2, pits and lands are sequentially formed with a length corresponding to an integral multiple of the reference period so that desired data is recorded.
[0039]
In the exposure of the master disc 2 by such an EFM modulation signal EFM, in the master disc creating apparatus 1, an error detection code and an error correction code are assigned to a copy protection key 5 by encryption data for restricting copying in a synchronization signal replacing circuit 8. After being added (FIG. 3), these are converted into a serial data sequence in a predetermined order to generate a key data sequence D2. Further, a synchronization signal is detected, and the synchronization signal of the first frame of the sub-coding frame is sequentially replaced according to the key data sequence D2.
[0040]
In this replacement (FIG. 4), continuation of pits and lands by periods 11T, 11T, or continuation of lands and pits by periods 11T, 11T, pits and lands by periods 11T, 10T, or lands and pits by periods 11T, 10T The pattern of the synchronizing signal is replaced and executed so that the length of a continuous and subsequent pit or land becomes longer by that amount.
[0041]
Accordingly, in the master disc producing apparatus 1, the timing of the edge of the pit and the edge of the land detected at the time of reproduction is set so as to change in units of the reference period, and the copy protection key 5 is recorded on the master disc 2. Also, in the compact disc 20 created from the master disc 2, pits and lands are created such that the timing of the edges of the pits and lands detected during reproduction is changed in units of the reference cycle, and the encrypted data is Be recorded.
[0042]
However, in the case of compact discs, even if the timing of the edges of the pits and lands is reproduced incorrectly due to scratches on the light transmitting layer that transmits the laser beam, if the scratches etc. are within a certain range, synchronization will not occur. It is configured to cover erroneous detection of a signal, so that, as in this embodiment, only the synchronization signal of the first frame of the subcoding frame is intentionally set so that the timing of the edge changes. However, it is possible not to affect the reproduction of the main data.
[0043]
As a result, in this embodiment, such a change in the timing of the edge is set within a range in which the data can be correctly reproduced, and the data that prohibits illegal copying is recorded without any hindrance to the reproduction in the existing reproducing apparatus. be able to.
[0044]
In the master disc producing apparatus 1, such a change in the timing of the edge is given to the synchronization signal, and a pattern that does not appear in other main data or the like is applied to the synchronization signal. In addition, illegal copying can be prohibited without any hindrance to playback on existing playback devices.
[0045]
In addition, by repeatedly recording the copy protection key 5 and recording the copy protection key 5 with an error detection code and an error correction code added thereto, the copy protection key 5 can be reliably reproduced, thereby making it illegal. Copying can be reliably prevented.
[0046]
In the compact disc 20 thus produced (FIG. 5), the return light obtained by irradiating the laser beam in the compact disc player 21 is received by the optical pickup 22, whereby the signal level is changed according to the pit train. Is generated, and the reproduced signal RF is processed, and the data recorded on the compact disc 20 is reproduced.
[0047]
In the compact disk player 21, in these processes, an error in the synchronization signal is detected by the sync decoder 24A, and the error detection result F is processed by the encryption decoder 25, and the copy protection key 5 is reproduced. Further, under the control of the system controller 23 by the copy protection key 5, the digital output DA is stopped, thereby preventing illegal copying.
[0048]
(1-3) Effects of the first embodiment
According to the above configuration, pits and lands are created such that the timing of the edges of the pits and lands detected at the time of reproduction is changed in units of the reference period within a range in which the data can be correctly reproduced, and the data is generated. By recording the encrypted data that restricts copying, illegal copying can be prohibited without any hindrance to playback on existing playback devices.
[0049]
Further, by creating such a change in the edge timing of the pits and lands in the pits and lands corresponding to the synchronization signal, it is possible to reliably prevent illegal copying without any hindrance to reproduction in an existing reproducing apparatus. .
[0050]
In addition, by recording together with the error detection code and the error correction code, and further by repeatedly recording, the encrypted data can be reliably reproduced.
[0051]
(2) Second embodiment
FIG. 7 is a time chart for explaining the disk master making apparatus according to the second embodiment of the present invention in comparison with FIG. In the master disc producing apparatus according to this embodiment, as shown in FIGS. 7C, 7D, and 7D, the EFM modulation signal EFM is shifted so that the timing of the end edge of the synchronization signal is delayed. Replace the sync signal. In this embodiment, the configuration is the same as that of the first embodiment except that the configuration related to the processing of the synchronization signal is different.
[0052]
Even if the timing of the edge is delayed in the synchronization signal as in this embodiment, the same effect as in the first embodiment can be obtained.
[0053]
(3) Third embodiment
FIG. 8 is a time chart for explaining the disk master making apparatus according to the third embodiment of the present invention in comparison with FIG. In the master disc producing apparatus according to this embodiment, as shown in FIGS. 8 (C), (D1) and (D2), in the reproduction signal RF, the timing of the end edge of the synchronization signal is equivalently determined. The synchronization signal of the EFM modulation signal EFM is replaced so as to speed up. In this embodiment, the configuration is the same as that of the first embodiment except that the configuration related to the processing of the synchronization signal is different.
[0054]
That is, in this embodiment, the logic 1 is made continuous at the end of the synchronization signal for a period of three clock cycles, so that the signal level of the EFM modulated signal EFM1 at the end of the synchronization signal has a period of 1T. One cycle is switched. In this manner, in a compact disc, pits are locally formed in corresponding portions, or pits with a truncated end are formed, but in a compact disc player, a finite number of pits are formed. By irradiating a laser beam having a large beam diameter and detecting the reproduction signal RF, a reproduction signal similar to that of the first embodiment can be detected. The effect of can be obtained.
[0055]
According to this embodiment, the same effect as that of the first embodiment can be obtained even if a pit or the like is created so that the timing of the end edge of the synchronization signal is accelerated.
[0056]
(4) Fourth embodiment
In this embodiment, the end of the synchronization signal, the 12-channel clock pattern is replaced with an 11-channel clock pattern, or the 12-channel clock pattern is replaced with a 13-channel clock pattern, and the synchronization signal is terminated. The edge timing is changed and the copy protection key is recorded. In this embodiment, the configuration is the same as that of the first embodiment except that the configuration related to the processing of the synchronization signal is different.
[0057]
Even if the timing of the end edge of the synchronization signal is changed and the copy protection key is recorded by increasing or decreasing the pattern of the synchronization signal as in this embodiment, the same effect as in the first embodiment can be obtained. Obtainable.
[0058]
(5) Fifth embodiment
In this embodiment, instead of the processing on the tail side of the synchronization signal according to the first to fourth embodiments described above, the processing on the head side of the synchronization signal, or the processing on the central part of the synchronization signal, or these The copy protection key is recorded by a combination, or a combination of these combinations and the processing on the tail side. In this embodiment, the configuration is the same as that of the first embodiment except that the configuration related to the processing of the synchronization signal is different.
[0059]
As in this embodiment, the copy protection key is recorded by the processing on the leading side of the synchronization signal, by the processing on the central part of the synchronization signal, or by a combination of these, or a combination of these combinations and the processing on the tail side. Even if it does in this way, the same effect as the first embodiment can be obtained. Further, in the processing of a combination of such processing, three or more states can be formed by a part where the timing of the edge is changed and a part where the timing of the edge is not changed at all, whereby the copy protection key is increased. It can also be recorded by value.
[0060]
(6) Sixth embodiment
In this embodiment, a copy protection key is recorded by a combination of a process for accelerating the timing of an edge related to a synchronization signal and a process for delaying the timing of an edge. In this embodiment, the configuration is the same as that of the first embodiment except that the configuration related to the processing of the synchronization signal is different.
[0061]
Even if the copy protection key is recorded by a combination of the processing for accelerating the timing of the edge and the processing for delaying the timing of the edge as in this embodiment, the same effect as in the first embodiment can be obtained. Can be obtained. Further, in this way, three states can be formed when the edge timing is not changed at all, and the copy protection key can be recorded in three values.
[0062]
(7) Seventh embodiment
FIG. 9 showing a comparison with FIG. 1 is a block diagram showing a disk master making apparatus according to a seventh embodiment of the present invention. In the master disk forming apparatus 31, the pattern replacement circuit 38 detects a pattern having a cycle 3T, which is the shortest cycle included in the EFM modulation signal EFM, and changes the edge timing by replacing this pattern. In this embodiment, the configuration is the same as that of the first embodiment except that the configuration related to the processing of the pattern related to the period 3T is different. In the same configuration, the same reference numerals are given and the duplicate description will be omitted.
[0063]
That is, in this embodiment, the pattern replacement circuit 38 monitors the EFM modulation signal EFM output from the EFM signal generation circuit 7 in a predetermined area under the control of the system controller 23, and is included in the EFM modulation signal EFM. A pattern having a period of 3T is detected. Further, for the predetermined pattern of the pattern of the period 3T detected in this way, FIGS. 10C, 10D, and 10D are compared with FIGS. 10A, 10B, and 10B. As shown in (1), the position of the trailing edge of the repetition of the periodic 3T pattern is changed, thereby recording the copy protection key.
[0064]
In this embodiment, the position of the trailing edge is changed so as to form a cycle 2T shorter than the cycle 3T, which is the shortest cycle included in the EFM modulated signal EFM. It is designed to mitigate.
[0065]
Even when the timing of the edge of the pits and lands is changed to the pits and lands having the shortest length formed on the optical disc as in this embodiment, the same effects as in the first embodiment can be obtained. Can be obtained.
[0066]
In addition, such a change in the timing of the edge has an effect on the processing of the main data by performing the process of further shortening the pits and lands compared to the pits and lands having the shortest length formed on the optical disc. It can be further reduced.
[0067]
(8) Eighth embodiment
In this embodiment, in place of the processing related to the pattern having the period 3T according to the seventh embodiment, a pattern having a period 11T which is the longest period included in the EFM modulation signal EFM corresponding to the main data is detected. The timing of the edge is changed by replacing this pattern. In this embodiment, the configuration is the same as that of the seventh embodiment except that the configuration related to the processing of the pattern relating to the period 11T is different.
[0068]
Further, in this embodiment, the timing of the edge of the pattern having the longest period 11T is changed so as to form a period 12T longer than the period 11T, thereby reducing the influence on the processing of the main data.
[0069]
Even if the change of the timing of the edge of the pit and the land is formed in the pit and the land having the longest length formed on the optical disc as in this embodiment, the same effect as in the first embodiment can be obtained. Can be obtained.
[0070]
In addition, such a change in the timing of the edge affects the processing of the main data by performing the process of making the pits and lands longer than the pits and lands having the longest length formed on the optical disk. It can be further reduced.
[0071]
(9) Ninth embodiment
In this embodiment, instead of the processing on the tail side related to the repetition of the pattern of the period 3T and the period 11T according to the seventh and eighth embodiments, the leading edge and / or the center edge is changed, or The copy protection key is recorded by a combination of the processing on the end side.
[0072]
In the patterns of the period 3T and the period 11T, the same effect as in the above-described embodiment can be obtained by changing the timing of the leading edge and the center edge.
[0073]
(10) Other embodiments
In the above-described embodiment, the case where the EFM modulated signal is processed by the replacement circuit to replace the synchronization signal and the like has been described. However, the present invention is not limited to this. May be generated from data to be used for recording.
[0074]
Further, in the above-described embodiment, the case where the copy protection key is recorded simply by changing the edge has been described. However, the present invention is not limited to this, and the key for decrypting the copy protection key is separately described above. The present invention can be widely applied to the case of recording according to the embodiment.
[0075]
Further, in the above-described embodiment, for example, a case has been described in which encrypted data is allocated to the first frame of a sub-coding frame. However, the present invention is not limited to this. The encryption data can be allocated at various timings as needed.
[0076]
Further, in the above-described embodiment, the case where the present invention is applied to a compact disk player has been described. However, the present invention is not limited to this, and can be widely applied to various optical disk devices such as an optical disk drive mounted on a computer. it can.
[0077]
Further, in the above-described embodiment, the case where the present invention is applied to a compact disk has been described. However, the present invention is not limited to this, and a CD-ROM, a DVD (Digital Video Disk), a so-called next-generation DVD, and furthermore, Can be widely applied to magneto-optical disks and the like.
[0078]
【The invention's effect】
As described above, according to the present invention, the timing of the edge of a pit and a land, or the timing of the edge of a mark and a space detected at the time of reproduction changes in units of a reference cycle within a range in which data can be correctly reproduced. In this way, by creating pits and lands or marks and spaces and recording encrypted data for restricting data copying, illegal copying can be prohibited without any hindrance to playback on existing playback devices.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a master disc producing apparatus according to a first embodiment of the present invention.
FIG. 2 is a table showing sub-coding frames by the master disc producing apparatus of FIG. 1;
FIG. 3 is a table provided for describing a copy protection key by the disc mastering apparatus of FIG. 1;
FIG. 4 is a time chart for explaining recording of a copy protection key by the master disc producing apparatus of FIG. 1;
FIG. 5 is a block diagram showing a compact disc player according to the first embodiment of the present invention.
FIG. 6 is a flowchart for explaining the operation of the compact disc player of FIG. 5;
FIG. 7 is a time chart for explaining a disc mastering apparatus according to a second embodiment of the present invention;
FIG. 8 is a time chart for explaining a disk master recording apparatus according to a third embodiment of the present invention.
FIG. 9 is a block diagram showing a master disc producing apparatus according to a seventh embodiment of the present invention.
FIG. 10 is a time chart for explaining the recording of a copy protection key by the master disc producing apparatus of FIG. 9;
[Explanation of symbols]
1, 31... Disk master creating device, 2... Disk master 3, 33... Formatter, 7... EFM signal generating circuit, 8... Synchronizing signal replacement circuit, 9... EFM signal output circuit, 20. Compact disk, 21: compact disk player, 24A: sync decoder, 25: encryption decoder, 23: system controller, 38: pattern replacement circuit

Claims (13)

In a data recording device that sequentially creates pits and lands or marks and spaces with a length corresponding to an integer multiple of a predetermined reference period and records desired data on an optical disc,
The pits and the pits and the edges of the pits and lands detected at the time of reproduction, or the timings of the edges of the marks and spaces are changed so that the data can be correctly reproduced in units of the reference period. A data recording apparatus for creating a land or a mark and a space and recording encrypted data for restricting copying of the data. Changes in the timing of the edges of the pits and lands, or changes in the timing of the edges of the marks and spaces,
2. The data recording apparatus according to claim 1, wherein the data is created in the pit and land or mark and space corresponding to a synchronization signal. Changes in the timing of the edges of the pits and lands, or changes in the timing of the edges of the marks and spaces,
2. The data recording apparatus according to claim 1, wherein the pits and lands or marks and spaces formed on the optical disk have the shortest length. Changes in the timing of the edges of the pits and lands, or changes in the timing of the edges of the marks and spaces,
2. The data recording apparatus according to claim 1, wherein the pits and lands or marks and spaces formed on the optical disk are the longest. 2. The data recording apparatus according to claim 1, wherein an error correction code is recorded together with the encrypted data. 2. The data recording apparatus according to claim 1, wherein the encrypted data is repeatedly recorded. In an optical disc in which pits and lands or marks and spaces are sequentially created with a length corresponding to an integral multiple of a predetermined reference period and desired data is recorded,
The pits and the pits and the edges of the pits and lands detected at the time of reproduction, or the timings of the edges of the marks and spaces are changed so that the data can be correctly reproduced in units of the reference period. An optical disc wherein lands or marks and spaces are created, and encrypted data for restricting copying of the data is recorded. Changes in the timing of the edges of the pits and lands, or changes in the timing of the edges of the marks and spaces,
8. The optical disk according to claim 7, wherein the optical disk is created in the pit and land or mark and space corresponding to a synchronization signal. Changes in the timing of the edges of the pits and lands, or changes in the timing of the edges of the marks and spaces,
The optical disk according to claim 7, wherein the optical disk is formed in a pit, land, mark, or space having the shortest length formed on the optical disk. Changes in the timing of the edges of the pits and lands, or changes in the timing of the edges of the marks and spaces,
8. The optical disk according to claim 7, wherein the optical disk is formed in the longest pit and land or mark and space. In an optical disc apparatus for reproducing an optical disc in which pits and lands or marks and spaces are sequentially created with a length corresponding to an integral multiple of a predetermined reference period and desired data is recorded,
Determine the timing of the edges of the pits and lands, or the timing of the edges of the marks and spaces, and reproduce encrypted data that restricts copying of the data,
An optical disc device, wherein reproduction and / or output of the data is restricted based on the reproduction result. In an encryption recording method for recording a desired encryption on an optical disc,
Pits and lands or marks and spaces are sequentially created with a length corresponding to an integral multiple of a predetermined reference period, and desired data is recorded on an optical disc,
The pits and the pits and the edges of the pits and lands detected at the time of reproduction, or the timings of the edges of the marks and spaces are changed so that the data can be correctly reproduced in units of the reference period. An encryption recording method, wherein a land or a mark and a space are created and the encryption is recorded. An encryption reproducing method for reproducing an encryption recorded on an optical disc,
The optical disc is
Pits and lands or marks and spaces are sequentially created with a length corresponding to an integral multiple of a predetermined reference period, and desired data is recorded,
The cipher reproduction method comprises:
A cipher reproducing method characterized by judging the timing of the edge of the pit and land, or the timing of the edge of the mark and space, and reproducing the cipher.

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