WO1995018443A1 - Support d'enregistrement optique, appareil de reproduction de disque optique, procede de reproduction du disque optique, procede de production d'original de disque optique, et procede de blocage de programme pirate - Google Patents
Support d'enregistrement optique, appareil de reproduction de disque optique, procede de reproduction du disque optique, procede de production d'original de disque optique, et procede de blocage de programme pirate Download PDFInfo
- Publication number
- WO1995018443A1 WO1995018443A1 PCT/JP1994/002304 JP9402304W WO9518443A1 WO 1995018443 A1 WO1995018443 A1 WO 1995018443A1 JP 9402304 W JP9402304 W JP 9402304W WO 9518443 A1 WO9518443 A1 WO 9518443A1
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- WIPO (PCT)
- Prior art keywords
- signal
- recorded
- recording
- offset
- optical
- Prior art date
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Classifications
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Definitions
- the present invention relates to the prevention of duplication of a recording medium, and in particular, to an optical disc having a duplication preventing function, a method of manufacturing such an optical disc, a method of reproducing an optical disc, a reproducing apparatus, a method of manufacturing a master optical disc, and an illegal program.
- the present invention relates to a method for stopping a system operation.
- optical discs are manufactured by sequentially producing a master, a mother, and a stamper from a master, and then using this stamper to reproduce a large amount by injection molding.
- stampers are made directly from the master.
- an optical disc master is coated with a photoresist on a glass substrate with a polished surface, and the photoresist is exposed to light using a laser beam whose intensity is modulated by an information signal to be recorded. After that, development is performed to form an uneven signal or groove or an uneven signal and groove corresponding to the sensitivity.
- the uneven signal or the groove, or the uneven signal and the groove are collectively referred to as a signal bit.
- Figure 6 shows a block diagram of a conventional master recording device.
- the laser optical system for focus control and the beam expander of the laser optical system for recording are omitted.
- the entire recording device of the master is indicated by 61A
- 1 is a recording laser
- 2 is an optical modulator
- 3 is a mirror
- 4 is a lens factory
- 5 is a photo.
- 6 An idle motor
- 7 is a signal source
- 8 is a recording equalizer.
- the signal generated by the signal source 7 has its pulse width changed by a fixed amount by a recording equalizer 8, is input to an optical modulator 2, and modulates the intensity of the laser light emitted from the recording laser 1.
- the intensity-modulated laser light passes through a mirror 3 and exposes a photo resist on a glass plate 5 through a lens whose focus is controlled by a lens actuator 4.
- the optical disc reproducing device focuses the semiconductor laser light on the signal surface of the optical disc, converts the intensity of the reflected light from the signal surface into an electric signal using a photo diode of an optical pickup, etc. RF signal), waveform shaping, demodulation to digital signal, and digital signal processing to reproduce the original signal.
- Fig. 7 shows a block diagram of the conventional optical disc reproducing device 47A.
- 9 is an optical disk
- 10 is an optical pickup
- 11 is a spindle motor
- 12 A is an analog waveform shaping section
- 13 is a digital demodulation section
- 14 is a digital signal processing section
- 1 is a digital signal processing section.
- 5 is a control unit
- 16 is a focus servo unit
- 17 is a tracking servo unit
- 18 is a rotary servo unit.
- Reference numeral 19A denotes a digital demodulation unit for demodulating the RF signal into a digital signal
- 2OA denotes a control unit for controlling the entire reproduction operation and for transmitting a display signal to the display unit 41.
- the signal immediately before demodulation into a digital signal that is, the RF signal has an infinity and a 'turn'.
- Figure 2 shows an example of an aike and a turn.
- the center of the eye pattern and the center of the amplitude may be slightly displaced (called asymmetry).
- the automatic correction slice circuit 31 The slice level Vs is corrected, and the center voltage Vs of the eyepiece is automatically detected and sliced as shown in the waveform (9) in FIG. Fino, 'The center of the turn will be described later.
- the duty ratio of the signal recorded on the master is corrected. This is called record equalization.
- the optimum value of the recording equalization amount varies depending on the recording power, the development conditions during pit transfer, the reproduction conditions, and the like.
- Some conventional optical disks have a duplication prevention flag recorded as a logical duplication inhibition signal. Therefore, when the reproduction signal is recorded on the optical disk on which the duplication prevention flag signal is recorded, this duplication prevention flag signal is detected, and the recording of the reproduction signal in the recording device is prevented.
- playback devices for ROM discs such as CDs have not conventionally had a function of preventing or prohibiting playback from an illegally copied medium.
- Optical disc media that can be written only once and can be played back by ordinary playback devices have been released.
- purchasing such an optical disc medium and duplicating (copying) it from a regular optical disc on the market makes it more expensive than purchasing a regular optical disc. And there was little need to take countermeasures against unauthorized duplication owing to the fact that it was expensive or that the writer for duplication was expensive and not widespread. ⁇
- the object of the present invention is to provide an optical disc with an area in which a signal of a predetermined pattern is recorded after a signal of a predetermined pattern, and a signal in which a signal shifted from the center of the amplitude of the turn is recorded is provided.
- the center of the eye pattern and the center of the amplitude will be described later.
- the signal reproduced by the reproducing device from the area where the signal whose center of the eye pattern is shifted from the center of the amplitude is recorded and demodulated into a digital signal is a regular signal, and the signal demodulated on a recordable optical disc medium is When recording, it is recorded so that the center of the eye pattern is almost at the center of the amplitude when reproduced. For this reason, if the playback device changes the threshold when demodulating the RF signal into a digital signal and plays it back, it will not be played back as a legitimate signal and playback will stop. The disc cannot be reproduced and illegal duplication can be prevented.
- FIG. 1 is a block diagram showing the configuration of a first embodiment of the optical disc reproducing apparatus of the present invention.
- Fig. 2 shows an example of an optical disk without a normal offset of an optical disk.
- FIG. 3 is a diagram showing an example of an eye pattern when an offset of the optical disc is given in the first embodiment.
- FIG. 4 is a diagram showing a change in asymmetry depending on the recording power and the recording equalization amount in the first embodiment.
- FIG. 5 is a block diagram showing a configuration of an example of a recording device for an optical disc master according to the first embodiment.
- FIG. 6 is a block diagram showing the configuration of a conventional optical disc master recording apparatus.
- FIG. 7 is a block diagram showing a configuration of a conventional optical disc reproducing apparatus.
- FIG. 8 is an explanatory diagram of a recording signal on an optical disc as a first embodiment of the optical recording medium of the present invention.
- FIGS. 9A and 9B show the first half and the second half of the flow chart of the duplicate disk operation preventing program in the first embodiment, respectively.
- FIG. 10 is an explanatory diagram of four recording methods of the CP signal arrangement information in the first embodiment.
- FIG. 11 is a flowchart of the disk collation using encryption in the first embodiment.
- FIG. 12 is a waveform diagram of the offset voltage when the pulse width and the laser power are changed in the first embodiment.
- FIGS. 13A and 13B are part of a block diagram of the master production apparatus (mastering apparatus) and the reproduction apparatus (recording / reproduction apparatus) in the first embodiment.
- FIGS. 14A and 14B show the first half and the second half of the process diagram of the single-master double-split recording method in the first embodiment, respectively.
- FIG. 15 is a flowchart of the application software including the anti-coby program in the first embodiment.
- FIG. 16 is a principle diagram of copy prevention in the first embodiment
- (b) is a principle diagram of copy prevention in the first embodiment.
- Figure 17 shows the measured address of each CD master in the first embodiment.
- FIG. 18 (a) is a waveform diagram of the method for detecting the rearrangement of the offset signal by time division in the first embodiment
- FIG. 18 (b) is the waveform diagram of the resetting of the offset signal by time division in the first embodiment.
- FIG. 7 is a waveform diagram of the arrangement information method
- (c) is a waveform diagram of the arrangement information method of the offset signal again by time division in the first embodiment
- (d) is a waveform diagram of the offset signal in the first embodiment. It is a waveform diagram of the offset signal relocation information method.
- FIGS. 19A and 19B show the first half and the second half of the flowchart for recording the offset CP signal on the master in the first embodiment, respectively.
- FIG. 20 is a block diagram showing the configuration of a second embodiment of the optical disc reproducing apparatus of the present invention.
- FIGS. 21A and 21B show the first half and the second half of the flowchart of the duplicate disk operation preventing program in the second embodiment, respectively.
- a special copy protect signal different from usual is mixed into a recording signal when a master of an optical ROM disc such as a CD as an optical recording medium is manufactured so that a special master is manufactured to prevent duplication. I have to.
- This special copy protect signal is referred to as a CP signal.
- the offset CP signal arrangement information signal 25 (specifically, the CP signal
- the duty ratio is shifted from the standard value (usually 50%) in order to shift the center of the error pattern from the center of the amplitude by a predetermined amount.
- An area in which signals 24 (24a to 24g) are recorded is provided.
- the center of the eye pattern refers to a portion corresponding to the optimum slice level (threshold) in the analog waveform shaping block at the time of reproduction by the reproducing apparatus.
- the center of the amplitude of the eye pattern refers to the center in the amplitude direction of the eye pattern measured geometrically.
- the CP signal preceding signal 26 (26a to 26g) of a specific pattern can be provided slightly before each CP signal 24a to 24g.
- the CP signal preceding signal 26 (26a to 26g) of this specific pattern is shifted in time from the center of the eye pattern by a predetermined offset from the center of the amplitude as the temporal order of reproduction. This is for clarifying that the CP signal recording area exists, and when provided together with the CP signal arrangement information 25, only one of them may be used.
- the second embodiment (FIGS. 20A, 21A and 21B) for checking the presence or absence of a CP signal using only the CP signal arrangement information 25 will be described later. This embodiment is different from the embodiment using only the CP signal arrangement information 25 in the embodiment and the first embodiment.
- FIG. 1 is a block diagram showing a first embodiment of the optical disc reproducing apparatus of the present invention.
- the CP signal arrangement information reproducing unit 27 detects both or one of the CP signal arrangement information 25 of a specific pattern and the CP signal preceding signals 26 a to 26 g shown in (a) of FIG. After that, a means for changing the threshold value Vs of the level slicer 28 when demodulating the RF signal into a digital signal by the offset amount VsR corresponding to the predetermined amount, and an eye pattern If the signal of offset V s R whose center is shifted from the center of amplitude by the above-mentioned predetermined amount does not play back correctly, it is determined that it is a duplicate disc and playback is stopped or read out.
- the program is a program for a program
- a stop means for stopping the operation of the program is provided.
- the entire playback device is indicated by 47, and 9 Is an optical disc, 10 is an optical pickup, 11 is a spindle motor, 12 is an analog waveform shaping section, 14 is a digital signal processing section, 16 is a focus servo section, and 17 is a focus servo section.
- the control section controls the threshold value to be changed in advance by the offset amount VsR when 5 or the CP signal preceding signal 26a to 26g is detected.
- the optical disk 9 is rotated by a spindle motor 11.
- the optical pickup 10 collects the semiconductor laser light on the signal recording surface of the optical disk 9 and converts the intensity of the light reflected from the signal surface into an electric signal using a photo diode, etc. Get.
- the optical pickup 10 is controlled by the force sensor unit 16 so that the signal surface of the T optical disk 9 is always focused, and the signal is sent to the tracking servo unit 17.
- the track is controlled so that the focus of the semiconductor laser beam follows.
- Waveform 9 in Fig. 2 shows an example of the eye pattern in a normally recorded area in which the center of Fino and 'Yu' is near the center of amplitude and no offset voltage is generated.
- the vertical axis of the figure indicates the amount of reflected light, and the upper side indicates the large amount of light.
- Waveform 9 in Fig. 3 shows an example of the eye pattern in the area where a signal in which the center of the eye pattern is shifted from the center of the amplitude by a sufficiently large appropriate offset voltage is recorded.
- the control unit 20 controls the movement of the entire reproducing apparatus, and, based on the reproduced signal, determines a threshold value, that is, a slice value V s when demodulating by the digital demodulation unit 19, and converts the above-mentioned eye pattern in the recording signal into the above-mentioned eye pattern. Command to change in a short time according to the center offset voltage.
- the control unit 20 may be configured as shown in FIG. Alternatively, a program may be programmed to operate according to the flow shown in FIGS. 9A and 9B using a CPU (central processing unit). In addition, a general-purpose personal console may be used as the control unit 20.
- an area (first recording area) is provided in which a signal is recorded in which the center of the noise is shifted from the center of the amplitude by a desired amount.
- This optical disc 9 has an arrangement table showing the arrangement status of the offset CP signal 24 in a normally recorded area where the center of the eye pattern is near the center of the amplitude in a certain range.
- CP signal arrangement information 25 and a CP signal preceding signal 26 of a specific pattern are recorded.
- the area where the signal 25 or 26 is recorded is referred to as a second recording area.
- the optical disc reproducing apparatus of the present invention intentionally shifts the center of the eye pattern to some extent after the specific pattern. Judge that the offset CP signal 24 is recorded.
- the analog waveform shaping unit 12 that demodulates the RF signal output from the optical backup 10 in Fig. 1 into a digital signal is configured as follows. .
- the analog waveform shaping section 12 has an automatic correction slice circuit 31 and an adder 31a provided in a feedback path thereof, and outputs an offset correction voltage via the adder 31a.
- the slice level changes instantaneously following the change in the center of the eye pattern. According to this operation, there is an effect that the offset voltage can be changed faster than the response speed of the level slicer 28 in the automatic correction slice circuit 31.
- the threshold value V s R of the slicer 28 when demodulating the RF signal of the reproducing apparatus into a digital signal is used as CP signal arrangement information. In advance, it is changed by the offset voltage AV s according to the information 25 or the CP preceding signal 26. Therefore, the area (the first recording area) in which the signal in which the center of the eye pattern is shifted from the center of the amplitude is recorded can be correctly reproduced.
- a specific pattern is also stored in the area where the offset signal is recorded (first recording area), that is, the CP signal 24 recording area. It is preferable to record the preceding signal of the vehicle.
- the preceding signal of this specific pattern is the signal 26h indicated by a point near the end of the recording area of the CP signal 24a in FIG. A similar signal is recorded near the end of the recording area of the other CP signals 24b, 24c,..., But is not shown.
- the preceding signal 26h is a signal that follows the CP signal, while the CP preceding signals 26a, 26b... Announce the fluctuation of the offset level before each CP signal 24.
- the offset level fluctuation (return to the original) is again announced.
- the preceding signal 26h indicates that the end of the first recording area in which the CP signal is recorded is near, and prompts preparation for returning to the original level. That is, when the preceding signal 26h is reproduced, the optical disc reproducing apparatus of the present invention drastically instantaneously changes the slice level when demodulating the RF signal into the digital signal, and returns to the normal value.
- any signal with a specific pattern that changes the threshold when demodulating an RF signal into a digital signal is not a problem.
- the center of the eye pattern in the region from one specific address An to another specific address An + 1 is the specular side of the amplitude (high reflectivity side).
- shift the threshold value to +1 so that
- the offset amount of the threshold value is shifted by, for example, 11 so that the center of the eye pattern is on the opposite side of the mirror surface of amplitude (the side with lower reflectance). This is indicated by the CP signal.location information 25 of FIG. 8 or a signal of a specific pattern.
- the direction to be displaced may be specified in one of the directions, and only the displacement may be indicated by 1 or 0.
- the playback device automatically corrects the slice level even if the duty ratio changes. (Trebel slicer) 3 1 is provided. Therefore, since the automatic correction slice circuit 31 automatically changes the threshold value when demodulating to a digital signal, the signal is reproduced as a normal correct signal. For this reason, on the duplicated optical disk, a normal signal with the center of the eye pattern almost at the center of the amplitude is also written in the area where the signal with the center of the eye pattern shifted from the center of the amplitude was recorded. It will be.
- the legitimate disc has an offset value in which the center of the eye pattern is shifted from the center of the amplitude, for example, V s + V s
- the auto-level slicer does not change the threshold value V s R for demodulating the RF signal into a digital signal, so A signal whose heart is approximately at the center of amplitude has no offset and cannot be identified as a legitimate disk.
- the playback device 47 has a means in which a signal recorded with the center of the eye pattern deviated from the center of the amplitude is in a regular area and has means for stopping playback if the playback is not performed correctly. Alternatively, the program operation stops automatically. In this way, reproduction or operation of the program of the duplicated optical disc cannot be performed, and use of the illegally duplicated optical disc can be prevented.
- signals are generally recorded spirally from the innermost circumference to the outer circumference.
- a compact disk (CD) and the like a read-in area is provided at the innermost circumference, and index information and the like of an optical disk are recorded.
- the area where the center of the eye pattern is shifted from the center of the amplitude and in which the CP signal is recorded corresponds to the lead-in area 32 of the CD as shown in FIG. 8 (a). If it is provided at the innermost periphery, it is desirable to be able to quickly determine whether or not the optical disc was duplicated at the start of playback.
- step 40a of the flowchart playback of the CD information, for example, the program of the Combine Night Program, begins.
- the following describes an example in which a computer program is reproduced as information on a CD.
- step 4 Ob check whether the disc is a CP signal compatible disc with the TOC (TABLE OF CONTENTS) flag or the like. If YES, in step 40 d, the CP from the playback signal is used as shown in (a) of Fig. 8. Obtain signal allocation information 25.
- Step 40e is for detecting the presence or absence of the CP signal arrangement information 25. If not detected, the operation is stopped. If the CP signal arrangement information 25 is present, the process proceeds to Step 4Of.
- step 40f the check of the offset CP signal 24 is started in the arrangement area of the offset CP signal 24, and is there a CP signal 24 in step 40g? For example, check for the presence of an offset slice level. If there is no offset slice level in this area, proceed to step 4Or. If all the check data has not been completed, the process returns to Step 4Of. If all the check data has been completed, the process proceeds to Step 40p, and it is determined that the disk is a duplicate disk.
- step 40 g If YES in step 40 g, proceed to step 40 h, and the data of the offset CP signal arrangement information 25 and the amplitude and cycle T of the physically detected offset CP signal 24. Check that the address, address, and angle position match in the regular disk matching unit 33 in Fig. 1.
- Step 40j the process proceeds to step 40j, and forcibly adds the offset voltage AVs to the slice level based on the CP signal arrangement information 25.
- Step 4 Ok check whether an error or an incorrect signal has occurred in the CP signal allocation area. If a certain level of error occurs in Step 40m, At 40p, it is determined that the disk is a duplicate disk. If no error of a certain level or more occurs in Step 4 Om, go to Step 4 On. When all checks have been completed, run the programming program read at step 40w, and if not completed, return to step 4Of.
- step 4 Op If it is determined in step 4 Op that the disc is a duplicate disc, the display of “duplicate disc” is displayed on the display unit 41 in step 4 Op. Next, the disk is ejected at step 40 s, the program operation is stopped at step 40 t, and the output is stopped overnight, and all the operations are stopped at step 40 Ou. Stop. Here, the reason why the error of Step 4 Ok occurs is described.
- the offset voltage greatly changes in a short time as in the case of the CP signals 24a and 24b in (a) of FIG. 8, the feedback control of the automatic correction slice circuit 31 is performed. Response speed does not follow. For this reason PCX contract
- the offset CP signal arrangement information 25 or the CP precedence signals 26a, 26b, 26c-- in FIG. It is known in advance that the offset voltage of the CP signal will change.
- the offset amount correction signal generator 29 shown in FIG. 1 converts the offset correction signal Vs into the automatic correction slice circuit 31 Slice level Vs output 3 Adds to the feed knock path of 0. Therefore, by adding the offset correction signal AVs at the change point where the CP signal 24 starts, the slice level Vs changes instantaneously to the value obtained by adding the offset ⁇ Vs, CP signal 24 can be reproduced normally without error.
- a specific duty ratio for example, 50:50, 30:70, 70:30, is added to the disc pit, so that As shown in (a), (b) and (c) of Fig. 8, the offset voltage is applied to the slice voltage during playback, and normal Vs, Vs + ⁇ Vs, Vs-AVs Three slice voltages are generated.
- an error is generated by adding a regular offset voltage to the slice voltage based on the offset CP signal arrangement information 25 or the CP preceding signal 26. Can be played without waking up.
- blocks 25, 34, and 36 simply indicate the type of signal input / output, and are not circuits or the like.
- a predetermined offset voltage AVs is set at the position of the predetermined address 36 of the CP signal arrangement information 25 by the offset amount correction signal generating unit 29. It is checked whether an error signal from the error signal detector 38 is generated at the position of the added signal. Further, the normal disk matching unit 33 checks whether a normal signal code is reproduced from the digital demodulation unit 19.
- a stop signal is output from the playback / program stop section 39 to stop the output of the playback signal, T / JP94 / 02304
- the offset voltage is not duplicated (correctly copied) on a disc illegally duplicated (duplicated) from the reproduction data of the regular disc 9, so the predetermined address described in the CP signal arrangement information 25 is used. There is no predetermined offset voltage at the rest position.
- the regular disk collating unit 33 in FIG. 1 compares the measured offset voltage (physical value) with the offset voltage (logical value) indicated by the CP arrangement information 25. Thus, it can be identified as an unauthorized disk.
- the automatic correction slice circuit 31 shown in FIG. 1 can follow the operating frequency of the offset correction control response frequency: f. To a degree. 'As shown in Fig. 8 (a), by setting the offset voltage high and the normal area so that the offset voltage changes at the frequency of f0 or more during reproduction, The slice level for automatic correction is fixed in the direction of higher offset voltage.
- the region with the normal offset value is sliced at a higher slice level than usual.
- the error is not generated because the normal signal is recorded so that a regular signal is reproduced when sliced at the higher offset voltage.
- the normal disk matching unit 33 in FIG. 1 determines that the disk is an illegal disk, and stops the operation.
- the three types of preceding signals 26, 26h, 26b CP preceding signals 26a, 26b and 6 h
- the slice level of the data of the next frame synchronization signal can be predicted, so this offset voltage ⁇ V s is set in the feed-back path of Fig. 1.
- the duplicator extracts a logical signal such as "101" of CD-RO.M and records the logical signal on the master, thereby producing the master and producing a large number of duplicate disks.
- a logical signal such as "101" of CD-RO.M
- the master disk is duplicated without changing the offset voltage.
- the data of the CP preceding signal 26 is copied as it is onto the illegally copied master.
- the slice level is forcibly set in the + direction based on the CP signal arrangement information 25 or the CP preceding signal 26. Therefore, an erroneous digital signal is output from the automatic correction slice circuit 31 in FIG. 1, an error signal is output from the error detection unit 38, and the disk is a duplicate disk in the normal disk matching unit 33. Is determined.
- the offset CP signal recording area, in which the signal whose center of the turn is shifted from the center of the amplitude, is recorded, the pulse width, that is, the duty ratio changes first by changing the recording equalization amount. It can be manufactured at any time. As shown by the waveform (1) in FIG.
- the recording equalization amount becomes large as shown in FIG.
- the duty ratio is as shown in the waveform (2) in Fig. 3, and the laser and light irradiation time are applied to the photo resist on the glass plate as shown in the recording waveform in (3) in Fig. 3.
- a signal pit having a small duty ratio that is, a signal pit having a depth of person / 4, which is short in the track direction, is formed.
- the amount of reflected light decreases little, so the signal whose center of reflected light is shifted in the positive direction as shown in waveform (6) in Fig. 3
- a signal is obtained in which the center of the eye pattern is shifted to the mirror side of the amplitude, that is, to the side with the higher reflectance by the offset voltage ⁇ Vs.
- the well-known automatic correction slice circuit 31 shown in FIG. 1 operates to automatically correct the slice level to Vs + AVs obtained by adding the offset AVs to the slice level Vs.
- This state is shown in Fig. 3 (7).
- the signal is sliced at a signal level of 3 T as shown in the waveform (9) of FIG.
- the correct digital output is obtained.
- an offset voltage of + AVs is generated in slicer 28.
- the recording equalization value that is, the “1001” amount
- the duty ratio increases and the laser light irradiation time increases, as shown in FIG. A long signal pitch is formed in the direction.
- the offset voltage at the center of the eye pattern as shown in the waveform (d) in Fig. 8 becomes negative, that is, the grip on the opposite side of the mirror surface of the width.
- a signal shifted by an offset voltage of 10 Vs to the lower reflectance side is obtained.
- the CP signal recording area in which the offset CP signal 24 in which the center of the eye pattern is shifted from the center of the amplitude by the offset voltage AVs changes the power of the laser light to be recorded in a predetermined manner. It's easy Can be made.
- Figure 4 schematically shows the change in the relationship between the recording power and the center of the amplitude of the center of the eye pattern due to the recording equalization amount.
- the horizontal axis represents the recording equalization amount. The larger the value, the shorter the pulse width of the recording signal, that is, the smaller the duty ratio.
- the vertical axis shows the deviation amount of the center of the eye pattern from the amplitude center, that is, the offset amount AV s is normalized by the amplitude and expressed as a percentage, and the higher the duty ratio control signal is, the higher the reflectance
- the offset voltage ⁇ V s increases in the positive direction because the center of the eye pattern is shifted to the side.
- the recording power increases in the order of (a), (b), and (c). Assuming that the recording power of (a) is 1.0,
- a digital signal like 6 is output. In this case, replication is difficult due to poor yield.
- FIG. 5 shows an example of a possible master recording device.
- the entire recording device of the master is indicated by reference numeral 61
- 1 is a recording laser
- 2 is an optical modulator
- 3 is a mirror
- 4 is a lens actuator
- 5 is a photo resist.
- 6 is Svin Dormo
- 7 is a signal source
- 21 is a recording equalizer
- 22 is a control unit.
- the beam expander of the laser beam optical system for focus control and the laser beam optical system for recording is omitted.
- step 50a normally, input data of a program in which a copy protection program such as a software for a preview is incorporated is input.
- CP signal arrangement information 25 is input, and is divided into control signals and data in CP signal arrangement information processing section 90, and this data is collated with input data in mixing section 90a.
- the control signal is sent to the control unit 22 to generate a duty ratio control signal at a predetermined position.
- step 50c this input information is checked to determine whether or not it should be recorded in the inner periphery. If YES, the step 50d offsets the lead-in to the read-in section. CP signal arrangement information 25 And the recording data are mixed and recorded.
- step 50e recording of the recording data is started.
- step 50f check whether the area is the offset signal recording area from the offset CP signal arrangement information 25. If step 50g is NO, record in step 50i with a normal duty ratio if NO in step 50g. . If YES, the CP signal generator 22a changes the duty ratio of the signal to the recording laser based on the offset CP signal arrangement information 25 in step 50h. Thus, the duty ratio and output of the laser beam are controlled so that the offset voltage changes to a predetermined waveform. Step 5 0 j ends all night If not, return to step 50 f.
- Step 50 k it is checked whether or not the offset CP signal arrangement signal 25 is to be recorded in the outer peripheral portion. If NO, the process ends at step 5 Op. If YES, compare the offset CP signal arrangement information pre-programmed in step 50 m with the offset CP signal amount, cycle, and arrangement actually recorded by the mastering device 61. And fix it.
- Step 5 On an offset CP signal arrangement information recording area is provided on the outer peripheral portion 5 b of the master 5 shown in FIG. 5, and this correction data is recorded.
- cutting is performed from the inner circumference to the outer circumference, so after recording all data, the offset creation result is considered to be data loss. It is.
- the offset CP signal arrangement information 25 corrected with this data is recorded, which has the effect of greatly improving the production yield of the master.o
- the control unit 22 controls the pulse width control unit 2 1a of the recording equalizer 21.
- the control unit 22 instructs the recording laser 1 to change the recording power.
- the recording laser 1 includes a laser element and an element for power adjustment, for example, a noise driver and an AO modulator, and changes the power of the recording laser 1 itself and adjusts the power. Or change the power with the same element.
- the recording equalizer 21 is configured so that the equalization amount can be switched by an external command.
- the area where the signal in which the center of the eye pattern is shifted from the center of the amplitude by the method described above is recorded can be easily formed without making a major modification to the conventional master recording apparatus.
- the optical disk of the present invention is manufactured in exactly the same process as a conventional optical disk except for recording of the master. It can be manufactured in large quantities and at low cost.
- the reproduction of the duplicated disc or the reproduction of the software is performed.
- the operation can be stopped, and duplication of the optical disk can be substantially prevented.
- An example of recording the offset CP signal arrangement information 25 in the optical ROM area is shown in FIG. 8.
- FIG. 10 uses the offset signal CP signal shown in Fig. 8 (a) and the address-one-angle arrangement information described in Figs. 16 (a), (b) and Fig. 17.
- FIG. 3 is a diagram schematically showing a state in which a CP signal of a system is measured from an optical disc 9 and CP signal arrangement information 25 is created.
- the optical disc 9 shown on the left side of FIG. 10 shows an example in which CP signals indicated by circles and polygons are arranged on each track.
- CP signal arrangement information 25 (not shown) is also recorded, and the read CP signal arrangement information 25 is stored in step 6 Ob in FIG.
- the data is encrypted by 2 and recorded on the magnetic recording section 46 of the optical disk and the outer peripheral portion 5 d of the master 5 by the recording circuit 44. Further, the information may be recorded on the second exposure portion 53 of the master 5 described in FIG. 14 or may be recorded by providing a bar code printed portion 99 on the inner periphery of the optical disc 9. Good.
- the CP signal arrangement information 25 recorded in the optical ROM section, the magnetic recording section, or the like cannot be falsified without obtaining the encryption key.
- the function of the cryptographic encoder cannot be deciphered from the function of the cryptographic decoder because it is encrypted with a one-way function. For example, if the usage is as shown in Fig. 11, the duplicator only knows the encryption Therefore, it is necessary to perform 2 5 12 times of operations, and this operation takes several million years.
- step 60j the CP signal arrangement information 25 is created, and in step 6Ob, a secret key of 512 bits is used to encrypt the RSA function.
- step 60c this encryption is performed. Record the number on an optical disc.
- step 60d the information of the optical disc is reproduced, and then at step 60e, the encryption is plaintexted.
- the replicator can know the function of the encrypted data in step 60d, but as shown in step 60b and step 60d, it is used in a public key communication method such as: SA : number.
- step 6Of the CP signal 24 of the optical disk measured in step 60k is compared with the plain-text CP signal arrangement information 25, and if the comparison result does not match (step 60) If g is NO), the program operation stops at step 6 Oh. If the collation results match (YES at step 60g), the program operation is executed at step 60i. Note that, in the example shown in FIG. 11, the CP signal 24 need not be the offset signal as described above. Therefore, falsification of the CP signal arrangement information 25 is practically impossible.
- the CP signal 24 does not have to be the offset signal as described above.
- the above-mentioned offset CP signal is realized as shown in Fig. 12 by changing the duty ratio of the pulse width of the recording equalizer or changing the laser light power.
- the relationship between the size of the pit holes is nonlinear. Therefore, make a master with the offset voltage as programmed. In this case, the yield is expected to decrease.
- the mastering device (master ring device) 61 shown in Figs.
- the CP signal arrangement information 25 and the logical I'D The logical ID from the number generator 5 4 6 is mixed with the mixer by a mixer, and encrypted by the one-way function encryption encoder (encryptor) 4 2, and the magnetic recording circuit 4 4 and the magnetic head 4 In step 5, the information is recorded in the magnetic recording section 46 of the optical disk. As described above, the CP signal arrangement information 25 cannot be falsified.
- the encrypted information is reproduced by the magnetic head 45a and the magnetic reproducing unit 48 of the recording / reproducing device 4.7, decrypted by the encryption decoder 43, and decrypted by the CP signal arrangement information 25.
- the CP signal arrangement information 25 measured from the above is sent to the regular disk matching unit 33.
- the master production device (mass ring device) 61 shown in FIGS. 13A and 13B corresponds to that shown in FIG. 5, and the reproduction device (recording / reproduction device) is also shown in FIG. It corresponds to the one shown.
- the normal disk collating unit 33 detects a duplicate disk and stops the operation of the program. Stops the output of the playback signal.
- a disk check is performed in the startup routine ⁇ ⁇ 0b, the program installation routine 70d, the print routine 7Of, and the file save routine 7Oh in the application program.
- routines 70c, 70e, 70g, 70i are included in the application program.
- a CP signal 24 such as a program at the first exposure section 520 of the master as shown in an optical disk 9b shown in FIGS.
- CP signal arrangement information 25 can also be recorded in the second exposure section 53. This method will be described in detail with reference to FIGS. 14A and 14B.
- steps 1 and 2 a laser beam signal is applied to the first exposure section 520 of the inner peripheral master, and in step 3, the master In other words, the outer peripheral portion is covered with a light-shielding protective film 54, and then the photo resist layer of the first photosensitive portion 55 is exposed.
- a pit pattern is formed by etching in step 4, and an offset signal is actually measured in step 5, and offset CP signal arrangement information 25 is obtained and encrypted.
- the light-shielding protective film 54 of the photosensitive section 56 is removed, and the above-mentioned encryption signal is recorded by the second laser light exposure.
- plating is performed, a metal master is formed, a disk substrate is formed by molding using the master, a reflective film is formed, and a CD is formed.
- an offset control signal is randomly given to the first exposure section 520 of the master to record, and the location of the passed offset CP signal is encrypted. Since the information is recorded in the second exposure section 53 of the outer circumference or inner circumference of the master, the copy protection signal with extremely low production yield should be recorded without worrying about the yield. The effect is that it can be done. This is because, for example, if a signal with a one-thousandth of the yield is to be duplicated, it is necessary to make a thousand masters, and the duplication business is not economically feasible.
- the rotation angle at which the offset CP signal is located is measured by the rotation angle detector 58 from the rotation pulse of the motor 57 (rotation sensor) not shown in Figs. 13A and 13B.
- the offset CP signal arrangement information 25a can be created as shown in FIG. Figure 1 As shown in (a), (b), and (C) of Fig. 8, the angular position can be detected more accurately by time-sharing the rotation pulse. As shown in (c) and (d) of FIG. 18, the arrangement of the address, the offset signal, and the period may be detected. In this case, since the disc is a regular disc, the measured offset CP signal arrangement information 25a is correct.
- the angular arrangement of the offset CP signal is Z3, Z2, Zl, and Z4.
- (b) in Fig. 16 shows Z3, Z2, Z4, and Z3, and there is a remarkable difference. Accurate control of this angular position is not possible with currently available mass-ring devices.
- This pattern cannot be duplicated, and the offset CP signal arrangement information 25a cannot be altered by one-way function encryption. Therefore, there is a great effect that the duplicator cannot duplicate this CD with the current equipment.
- the offset CP signal arrangement information 25 may be recorded on the optical disc by a bar-code-like low reflection portion group.
- FIGS. 20 and 21A and 21B a second embodiment of the optical recording medium of the present invention and a second embodiment of the optical disc reproducing apparatus will be described with reference to FIGS. 20 and 21A and 21B.
- the preceding signals 26a to 26h were recorded in the second embodiment, it is not necessary to record the preceding signals 26a to 26h in the second embodiment. Not detected).
- the reproducing apparatus 47 B of FIG. 20 differs from FIG. 1 in the following points. That is, in FIG. 1, the adder 3 la provided on the feedback path of the automatic correction slicing circuit 31 is removed, and the offset amount correction signal generator 29 is also removed. Therefore, in FIG. 20, the automatic correction slice circuit is indicated by 31 B, the analog waveform shaping unit is indicated by 12 B, and the control unit is indicated by 20 B. In FIG. 20, a rotation angle detection unit 58 for detecting the rotation angle of the motor 11 is provided in the control unit 20B. Also, an encryption decoder 43 is provided and the digital demodulation section is indicated by 19B.
- FIGS. 21A and 21B are flowcharts showing a processing procedure when the control unit 2OA is configured by a CPU. Using this flowchart, a description will be given of a duplication check method using the CP signal including the CP signal arrangement information 25-address angle arrangement information.
- the CP signal arrangement information 25 is encrypted in advance using an encryption encoder using a one-way function such as an RSA function.
- the flowcharts of FIGS. 21A and 2B have much in common with FIGS. 9A and 9B, so only different steps will be described.
- the CP signal arrangement information 25 encrypted in step 80d is plaintexted by the encryption decoder 43 in the digital demodulation unit 19A, and in step 80e, the plaintext is checked for correctness. Since a one-way function such as the RSA function is used, a correct cipher cannot be generated unless the key of the cipher encoder is leaked. First, a primary check of tampering with the cipher can be performed at this stage.
- Step 80f If the primary check is YES, start the disk duplication check in step 80f, and measure the disk in step 80g to obtain a CP signal such as an offset signal. Check if there is any. If there is a CP signal, go to step 8 Oh. Check only the angular position of the address. If it is checked, skip Step 8 Og and proceed to Step 8 Oh.
- a CP signal such as an offset signal.
- step 80h the CP signal is verified.
- this collation There are two methods for this collation: one is to use an offset signal as the CP signal, and the other is to use the physical angular arrangement information on the disc at a specific address as the CP signal.
- the CP signal of the offset signal system the angular position on the address or the disk where the offset signal is arranged is measured, and the CP signal arrangement information 25 Check whether the data matches the data of the normal address position of the corresponding CP signal or the data of the normal angular position on the disk as shown in (1).
- the angle position arranged on the specific address disk is measured, and the CP signal arrangement information 25 It is checked whether it matches the regular angle arrangement information data shown in (1).
- step 40e If the collation results do not match in step 40e, it is determined that the disc is a duplicate disc, and the program operation is stopped or playback is stopped. Operate only when the collation result is correct.
- the collation work in FIG. 21A and FIG. 21B may be performed on the CD drive, or may be performed on a computer connected to the CD drive or on a list of application programs.
- the CP signal arrangement information 25 cannot be falsified because an encryption encoder using a one-way function is used. Therefore, even if the duplicator makes a duplicate disk that appropriately forms the CP signal on the disk and falsifies the CP signal arrangement information 25 so that this CP signal matches the verification result, it cannot be falsified. Therefore, duplication can be prevented.
- the optical disc and the reproducing apparatus are characterized in that an optical disc is provided with an area in which a signal in which the center of the eye pattern is shifted from the center of the amplitude is recorded after the signal of a constant pattern, and the reproducing apparatus has a constant Pattern signal After detecting the signal, a signal in which the center of Aino Yun is shifted from the center of amplitude is reproduced by intentionally applying an offset voltage to the threshold value for demodulating the RF signal into a digital signal, A function is added to stop playback if the offset signal is not played.
- a signal reproduced by a reproducing apparatus from a region where a signal in which the center of the eye pattern is shifted from the center of the amplitude is recorded and demodulated digitally is a normal signal, and is a signal demodulated on a recordable optical disc medium. Is recorded so that the center of the eye pattern is almost at the center of the amplitude when reproduced. For this reason, if the playback device adds an offset to the slice level when demodulating the RF signal into a digital signal and plays it back, it will not be played back as a normal signal and playback will stop. The disc cannot be reproduced and illegal duplication can be prevented.
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/507,495 US5807640A (en) | 1993-12-28 | 1994-12-28 | Optical recording medium, reproducing system, method of reproducing optical disk, method of fabricating optical disk original record, and method of stopping illegal program operation |
KR1019950703642A KR100340266B1 (ko) | 1993-12-28 | 1994-12-28 | 광기록매체,광디스크의재생장치,광디스크의재생방법,광디스크원반의제조방법및불법프로그램동작정지방법 |
DE69431713T DE69431713T2 (de) | 1993-12-28 | 1994-12-28 | Optisches aufzeichnungsmedium, gerät zur wiedergabe von einer optischen platte, verfahren zur wiedergabe von einer optischen platte, verfahren zur herstellung von einer originalplatte und verfahren zum halten von illegalem programmablauf |
EP95904033A EP0689200B1 (en) | 1993-12-28 | 1994-12-28 | Optical recording medium, reproduction apparatus of optical disk, reproduction method of optical disk, production method of original disk of optical disk, and illegal program operation stop method |
US09/664,434 USRE40330E1 (en) | 1993-12-28 | 1994-12-28 | Optical recording medium, reproducing system, method of reproducing optical disk, method of fabricating optical disk original record, and method of stopping illegal program operation |
TW086102384A TW462039B (en) | 1993-07-27 | 1995-01-26 | Optical recording medium, reproduction apparatus of optical disk and method thereof, fabricating method of the original optic disk, and illegal program operation stop method |
TW084100693A TW310421B (ja) | 1993-07-27 | 1995-01-26 |
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33516593 | 1993-12-28 | ||
JP5/335165 | 1993-12-28 | ||
JP6/22191 | 1994-01-20 | ||
JP2219194 | 1994-01-20 | ||
JP10487994 | 1994-04-18 | ||
JP6/104879 | 1994-04-18 | ||
JP15608994 | 1994-07-07 | ||
JP6/156089 | 1994-07-07 | ||
JP29950894 | 1994-12-02 | ||
JP6/299508 | 1994-12-02 |
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WO1995018443A1 true WO1995018443A1 (fr) | 1995-07-06 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP1994/002304 WO1995018443A1 (fr) | 1993-07-27 | 1994-12-28 | Support d'enregistrement optique, appareil de reproduction de disque optique, procede de reproduction du disque optique, procede de production d'original de disque optique, et procede de blocage de programme pirate |
Country Status (6)
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US (2) | US5807640A (ja) |
EP (2) | EP1244095B1 (ja) |
KR (2) | KR100375494B1 (ja) |
CN (2) | CN1126082C (ja) |
DE (2) | DE69431713T2 (ja) |
WO (1) | WO1995018443A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
EP1244095A2 (en) | 2002-09-25 |
EP0689200A1 (en) | 1995-12-27 |
KR960701438A (ko) | 1996-02-24 |
DE69431713D1 (de) | 2002-12-19 |
CN1400596A (zh) | 2003-03-05 |
EP0689200B1 (en) | 2002-11-13 |
EP1244095A3 (en) | 2005-03-30 |
CN1126082C (zh) | 2003-10-29 |
KR100340266B1 (ko) | 2002-12-05 |
US5807640A (en) | 1998-09-15 |
EP0689200A4 (en) | 1996-05-29 |
CN1119895A (zh) | 1996-04-03 |
KR100375494B1 (ko) | 2003-03-10 |
DE69431713T2 (de) | 2003-07-03 |
EP1244095B1 (en) | 2006-12-27 |
DE69434901D1 (de) | 2007-02-08 |
DE69434901T2 (de) | 2007-07-05 |
USRE40330E1 (en) | 2008-05-20 |
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