JP3329333B2 - Video signal reproducing method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal reproducing method and apparatus for preventing copying of digital data and preventing unauthorized use.

[0002]

2. Description of the Related Art In recent years, as digital recording media such as optical disks have become larger in capacity and spread, it has become important to prevent illegal copying in order to protect the copyright of recorded signals. That is, in the case of digital audio data or digital video data, a copy without deterioration can be easily generated by copying or dubbing, and in the case of computer data, the same data as the original data can be easily copied. However, the fact is that illegal copying has already caused adverse effects such as copyright infringement.

[0003] For this reason, in order to prevent the illegal copying in so-called digital dubbing in which a digital signal reproduced from a signal recorded on a digital recording medium is recorded again on the digital recording medium, the original digital recording medium is used. In some cases, a predetermined ID bit is recorded to prevent illegal copying.

For example, a so-called R-DAT (Rotary hea)
The digital audio signal recording / reproducing apparatus referred to as “d Digital Audio Tape Recoder” is a method for preventing the illegal copying described above. The digital audio signal is recorded in a main data area of a digital audio signal recorded on a digital audio tape as a digital recording medium. A prohibition code (so-called SCMS: prohibition code of the standard of the serial copy management system) for prohibiting copy prohibition or stepwise generation copy (that is, generation restriction) is recorded, and the digital audio signal recording apparatus records the prohibition code. Is detected, a method of prohibiting copy recording of the digital audio signal on a new digital audio tape is adopted.

[0005]

By the way, for example, a digital video signal recorded on a digital recording medium such as a digital disk or a digital tape is reproduced, and the digital video signal is again recorded on the digital recording medium. Even in the case of digital dubbing, in order to protect the copyright of the signal recorded on the original digital video recording medium, the R-DAT
As with the method of preventing illegal copying between recording / reproducing devices in the above, it is possible to record a predetermined ID bit (CGMS: copy generation management system standard prohibition code) for preventing illegal copying on the original digital recording medium. Conceivable.

[0006] However, in the case of the method of recording the predetermined ID bits for preventing the illegal copying on the original digital recording medium, it works well for preventing the illegal copying in digital dubbing as described above. A digital video signal recorded on an original digital recording medium is reproduced and D / A converted to an analog video signal once, and this analog video signal is recorded in an analog form. In the case of digital recording after A / D conversion, the function of preventing illegal copying does not work, and recording can be performed as it is.

That is, the digital video signal recorded on the digital recording medium as described above is reproduced to
Even when the analog video signal is A-converted and the analog video signal is recorded as it is, or when the A / D conversion is performed and the digital video signal is returned to the digital video signal,
Since the video signal after dubbing has very little deterioration in quality, it becomes insufficient for copyright protection,
Therefore, there is a need for a method that can reliably prevent such illegal copying. In particular, in recent years, large-capacity disk-shaped digital recording media have become widespread as recording media, and measures to prevent illegal copying of digital video signals recorded on the disk-shaped digital recording medium are desired.

In the digital dubbing,
For the purpose of preventing illegal copying, for example, the predetermined ID
If bits are skipped, illegal copying can be easily realized. Therefore, a measure to prevent such illegal copying that skips the ID bit is desired.

The above illegal copy prevention measure is not limited to digital video signals, but is similarly desired for digital audio signals and other digital data.

Therefore, the present invention has been made in view of such circumstances, and it is prohibited to temporarily convert digital data into an analog signal and to illegally copy it in an analog or digital manner. It is an object of the present invention to provide a video signal reproducing method and apparatus capable of prohibiting generation copying.

[0011]

SUMMARY OF THE INVENTION A video signal reproducing method and apparatus according to the present invention are provided at the beginning of a recording track for controlling a video signal digitized and encrypted with key information and a reproduction state. Playback mode control signal area section,
And / or reproducing the optical digital disk medium on which the recording control code and the key information including the recording prohibition signal and the recording generation restriction instruction signal arranged in each header portion of the digital video signal which is divided into sectors are recorded. Detecting the state of the recording control code and the key information arranged in the reproduction mode control signal area portion of the optical digital disk medium and / or each header portion when outputting at least an analog video signal; The encryption applied to the video signal is decrypted by using the detected key information, the encrypted digital video signal is converted into an analog video signal, and the converted analog video signal is converted into an analog video signal. On the other hand, based on the detected recording control code, at least a recording scramble signal in the form of an analog video signal and a new generation restriction instruction signal are issued. Then, the recording scramble signal and the new generation restriction instruction signal are added to a predetermined area of a vertical blanking period of the converted analog video signal, and the recording scramble signal and the new generation restriction instruction signal are added. Output analog video signals
The above-mentioned problem is solved.

[0012]

[0013]

Here, in the present invention, the process for preventing illegal copying includes a process of performing a predetermined conversion process on an analog signal or a process of scrambling a digital signal. For example,
Examples of the process for preventing the illegal copying of the analog video signal include a process of adding a recording scramble signal and / or a recording prohibition signal to a predetermined area of a vertical blanking period of the analog video signal. The process of digitally scrambling the digital data obtained is also an example of a process for preventing illegal copying. As a specific example of the process of adding the recording scramble signal and / or the recording prohibition signal, a plurality of white peak signals or a plurality of pseudo sync pulses are provided over a plurality of horizontal periods in a vertical retrace period of the analog video signal. A process of arranging a combination signal with a plurality of white peak signals, a process of changing a phase of at least a part of a color burst signal of an analog color video signal, and a predetermined horizontal period in a vertical retrace period of the analog video signal And processing for arranging a signal coded with a plurality of bits for preventing illegal copying.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

An optical disk is taken as an example of a digital recording medium used in the embodiment of the present invention, and a flow until manufacturing the optical disk will be described with reference to FIG.

First, in a mastering step 30 for producing a master disk MD, a terminal 1 is connected to, for example, digital video data obtained by converting a cinema film into a digital signal, digital data sent directly from a digital camera, and Digital VTR is supplied from the digital VTR. For example, digital video data supplied via the terminal 1 is sent to a compression / encoding circuit 2 where a so-called MPEG (Movi)
MPE standardized by ng Picture Image Coding Experts Group)
G2 compression coding is performed, and the data is sectorized in units of a predetermined data amount, for example, 2048 bytes.

The data which has been compression-encoded and sectorized by the compression-encoding circuit 2 is sent to a scramble circuit 9 as required. The scramble circuit 9 is also supplied with copy management information generated by the copy management information generation circuit 3 for preventing illegal copying, which will be described later, and uses the copy management information to output the output of the compression encoding circuit 2. Data is scrambled as described later.

The data scrambled by the scramble circuit 9 is sent to a copy management information adding circuit. The copy management information adding circuit is also supplied with the copy management information generated by the copy management information generation circuit 3, and the copy management information is added to the output data of the scramble circuit 9 here.

When adding a recording scramble signal and / or a recording prohibition signal in the form of an analog video signal to the analog video signal, the scramble circuit 9 is omitted and the data from the compression encoding circuit 2 is directly transmitted. It may be sent to the copy management information adding circuit.

This copy management information corresponds to the innermost circumference or the outermost circumference of the optical disk, and corresponds to the so-called T of the lead-in area provided at the beginning of the spiral optical track.
It is added to one or both of the OC (Table Of Contents) and the header of the data sector in the program area. In the following description, an example is described in which the information is added to both the TOC and the header of the data sector. For this reason, the copy management information adding circuit includes:
The TOC has an additional circuit 4 for adding the copy management information to the TOC and an additional circuit 5 for adding the copy management information to the header of the data sector.

The copy management information includes one or both of information indicating that analog and digital copying is prohibited or only digital copying is prohibited, and information indicating copy generation restriction. The following example will be described as including both of these information. Note that the copy management information can also include accounting information. By including this billing information in the copy management information,
Based on the billing information, for example, only video playback is free, copying is paid, and copying is allowed only when a fee is paid (copying is prohibited if no fee is paid). It is also possible to do.

At this time, the copy management information includes
As shown in FIG. 2, there can be mentioned, for example, one consisting of 8 bits b7 to b0. Of these 8 bits, for example, bits b7 and b6 on the upper side are allocated as bits CM _C indicating generation restriction,
2, b1, b0 bit is assumed to be assigned as a bit CM _M which instructs to prohibit copying only prohibit or digital copies of the digital and analog. Here, for example, the CM _M bits (b2, b
When (1, b0) is (1, 1, 1), digital and analog copy prohibition is indicated, and when (0, 1, 1), digital copy prohibition is indicated. The bit CM _C assigned to generation restriction in the copy management information in the preparation stage of the master disc MD will indicate the effect that the original disc.

Further, for example, only the bits b2, it is conceivable to assign a bit CM _M for instructing not to prohibit or inhibit copying.

The reason why the copy management information is inserted for each sector as described above is, for example, an application such as a so-called CD-ROM, that is, several types of video signals of different categories are contained in one disc. Therefore, in order to be able to cope with cases that are not centrally managed,
This is because, instead of the entire surface of the disk, the disk is divided and arranged in the disk so as to correspond to each category. Also, it is possible to add copy management information for each predetermined block unit instead of for each sector.

The data to which the copy management information has been added by the copy management information addition circuit is sent to the encoder / modulation circuit 6. The encoder / modulation circuit 6 adds a parity to the supplied data by performing data delay and parity calculation as error correction coding processing,
According to a predetermined modulation method, for example, 8-bit data is converted to 16 bits.
The data is converted into channel bit modulation data, and a synchronization signal of a so-called out-of-rule pattern that breaks the modulation rule of the predetermined modulation method is added in a predetermined data amount unit. send.

The optical head device 7 supplies a laser beam driven based on data supplied from the encoder / modulation circuit 6 to a master disk MD rotated by a spindle motor 8 under rotation servo control. Optical recording is performed by irradiation. This allows
The production of the master disk MD on which data has been recorded is completed.

Here, the scramble circuit 9 is realized by, for example, a configuration as shown in FIG.

In FIG. 3, a so-called parallel block synchronous type scrambler using a 15-bit shift register can be used as the scramble circuit 9. Terminal 4 for data input of this scrambler
5, the LSB (least significant bit) is temporally earlier, that is, in the so-called LSB first order, the data section of the compression encoding circuit 2 shown in FIG.
Data obtained by adding 4 bytes of an error detection code (EDC) to 2048 bytes of the data portion is input. 15-bit shift register 41 for scrambling
Is subjected to feedback in accordance with a generator polynomial g (x) = x ¹⁵ + x + 1 using an exclusive OR (ExOR) circuit 42. The 15-bit shift register 41 performs copy management as shown in FIG. The bit C of the information
Bit of _{M M b2, b1, b0 (} 1,1,1, or 0,
The preset value (or the initial value) is variably set according to (1, 1), and the preset value can be switched in sector units. The above preset value, in addition to what is variably set only in the bit CM _M, may be assumed to be variably set by both the bit CM _M and the bit CM _C. The output data from the shift register 41 and the input data from the terminal 45 are exclusive-ORed by the ExOR circuit 43 and taken out from the terminal 44 as scrambled data. Sent to the circuit.

Next, in the replication step 40, a plurality of optical disks D are manufactured by pressing from the master disk MD manufactured as described above.

The disk D copied from the master disk MD in the replication step 40 has a center hole 102 at the center as shown in FIG. Lead-in area 103 which is the TOC area which is the management area
And a program area 10 in which program data is recorded
4 and a program end area, a so-called lead-out area 105. In this case,
Video data that has been subjected to the above-described processing such as compression encoding is recorded in the program area 104, and time information and the like of the video data are managed in the lead-in area 103. The above-described copy management information is recorded in a TOC sector of the lead-in area 103 and / or in a header of a data sector in the program area 104.

Here, as shown in FIG. 5, the structure of the data sector in the program area 104 is a data sync part D of 4 bytes (1 byte is 8 bits hereinafter).
_S and a header portion D _H of 16 bytes, a data portion D _D 2048 bytes consists of a 4-byte EDC (Error Detection Code) part D _E, the copy management information (1 byte) D _P Are arranged in the header section _DH . The structure of a sector of TOC of the lead-in area 103, as shown in FIG. 6, 4 bytes (1 byte 8 bits) and the data sink T _S of a header portion T _H of 16 bytes, 2048
Byte and TOC data portion T _D of, consists of a 4-byte EDC (Error Detection Code) part T _E, the copy management information (1 byte) T _P is TOC data portion T _D
Is arranged within.

[0033] Of course, the copy management information T _P is the address in combination with with copy management information of the file unit such as a file can either (location of the file, a pair size and copy management information) that the number of bytes (bits increase the number) may also have a detailed copy management information from said copy management information D _P.

The optical disk D as described above is sold, for example, or rented as an original disk, and distributed to the user. The original optical disc D is reproduced by a user, for example, at home.

That is, returning to FIG. 1, in the reproducing apparatus 50 for home use or the like of the optical disc D, the optical head apparatus 10 outputs a signal from the optical disc D rotated by the spindle motor 11, which is rotationally controlled by the servo circuit 13. (RF signal) is read. The RF signal read from the optical disc D by the optical head device 10 is sent to the RF amplifier 12. In the RF amplifier 12, the above R
The F signal is binarized to take out the signal recorded on the optical disc D, and the binarized signal is sent to the demodulation circuit 14, and the synchronization signal is separated from the RF signal. The signal and the like are taken out and sent to the servo circuit 13. In the servo circuit 13,
Based on these signals, rotation control of the spindle motor 11 and the above-described tracking servo and focus servo of the optical head device 10 are performed.

The demodulation circuit 14 performs a process of demodulating the previously applied modulation, for example, a process of converting 16 channel bits into 8-bit data. The demodulation circuit 1
The digital data from No. 4 is sent to the error correction circuit 15 and subjected to the inverse processing of the previously performed error correction coding. The digital video data output from the error correction circuit 15 is decomposed into sectors by a sector decomposing circuit 16 and passes through a copy management information reading circuit, which will be described later, and a subsequent descrambling circuit 31 to a decompression decoding circuit 21. Sent.

In the decompression decoding circuit 21, the MPE
Decompression decoding is performed on the data that has been compression-encoded according to the rule of G2. The decompressed and decoded digital data is converted into an analog video signal by a D / A conversion circuit 23, and an analog signal of a so-called NTSC standard of a television standard broadcast system by an NTSC encoder 25 via a mix circuit 24 described later. After being converted into a signal, the signal is output through an NTSC output terminal 28 or is output from an analog output terminal 29 as an analog video signal.

The digital data from the expansion / decoding circuit 21 passes through a digital scramble circuit 31 to be described later, and is output from a digital output terminal 27 as digital video data via a digital interface circuit 26. .

On the other hand, the copy management information reading circuit includes a reading circuit 18 for reading the added copy management information from the header of the data sector as described above,
A read circuit 17 for reading the added copy management information from the TOC data area of the sector of
The copy management information read from the data from the sector decomposition circuit 16 is sent to the copy management information determination circuit 19.
When the copy management information is added to only one of the TOC and the header of the data sector, only one of the reading circuits 17 and 18 is correspondingly provided.

The copy management information determining circuit 19 might instruct any effect that bit CM _M of FIG. 2 of the copy management information is prohibited only prohibition or digital copying analog and digital copy, also of the Figure 2 Bit CM
_C makes a state determination as to what generation the copy generation restriction indicates, and outputs a determination signal according to these determination results. This discrimination signal is sent to a protect signal generation circuit 20 described later. Further, a copy management information determination circuit 19
Transmits the copy management information to the descramble circuit 31.
Send to

The de-scramble circuit 31 has a configuration similar to that of the scramble circuit 9 of FIG. 3, and is based on the copy management information from the copy management information discriminating circuit 19. A preset value (or an initial value) is variably set. Thus, the descrambling circuit 31 de-scrambles the scramble processing in the scramble circuit 9.
Scramble processing, that is, encryption / decryption is performed. In other words, in the descrambling circuit 31, the copy management information reading circuit reads from the header of the data sector or the TOC data area of the TOC sector and has no copy management information supplied through the copy management information determination circuit 19. If this is the case, the scramble cannot be released. The data descrambled by the de-scramble circuit 31 is sent to the decompression decoding circuit 21. The de-scramble circuit 31
May be set based on the key information specified by the copy management information.

In the digital scramble circuit 32 supplied with the digital data from the decompression / decoding circuit 21, the digital video data from the decompression / decoding circuit 21 based on the copy management information, similarly to the scramble circuit 9, is used. Is subjected to digital scramble processing. Thereby, the digital scramble circuit 32
Thus, the digital video data subjected to the scramble processing is output, and the data is output from the digital interface circuit 26. Note that the digital scramble circuit 32 can also perform digital scramble processing based on the key information specified by the copy management information.

By the way, in the case where so-called digital dubbing is performed in which digital data obtained by reproducing a signal recorded on an optical disk (that is, a digital recording medium) is recorded as digital data on another digital recording medium, illegal copying is prevented. For the purpose, there is a method of recording a predetermined ID bit as copy management information on an optical disc as described in the above-mentioned conventional technique, but the copy management information, that is, the ID bit is skipped. Then, illegal copying can be easily realized.

On the other hand, according to the configuration example of the present invention, even if the copy management information is skipped from the header of the data sector or the data area of the TOC for the purpose of illegal copying, the optical disk D can be read. Since the recorded digital data has been subjected to scramble processing based on the copy management information, the scramble cannot be descrambled, so that illegal copying can be prevented. Furthermore, according to the configuration example of the present invention, the digital scramble circuit 32 performs the digital scramble process based on the copy management information. In the case of digital dubbing, the digital scramble process is performed. Digital data is copied, and the above-mentioned copy management information is required to descramble the scramble. This also makes it possible to prevent illegal copying.

In the above example, the digital scramble circuit 3 is provided before the digital interface circuit 26.
2 is provided, but the scramble circuit 3
It is also possible to provide a switch 33 instead of 2.
In this case, if the switch 33 is controlled to be turned off when the content of the copy management information indicates that copying is prohibited, the digital interface circuit 26
, No digital video data is output, and at this time, illegal copying in digital dubbing can be prevented. The switch 33
Is provided, the signal sent from the copy management information determination circuit 19 to the switch 33 is a switch switching control signal corresponding to the copy management information.

In the digital dubbing, when the generation limit bit CM _{C of the} copy management information permits, for example, copying of the current generation, the digital scramble circuit 32 does not perform the digital scramble processing (the switch 33 is turned off). If it is provided, the switch 33 is turned ON), and the digital data can be output as it is. However, in the example of FIG. 2 described above, the bit _CMM has a value that prohibits digital copying in any case.
In the example, the switch 33 is not turned on.

FIG. 7 shows an example in which copying is prohibited by the switch 22 without performing the scrambling or descrambling.

In the example shown in FIG.
In the above, the data compressed and sectorized by the compression encoding circuit 2 is directly used as a copy management information addition circuit (an addition circuit 4 for adding copy management information in the TOC and a copy management information in the header of the data sector). The information is sent to an additional circuit 5) for adding information. In the reproducing apparatus 50, the digital video data decomposed into sectors by the sector decomposing circuit 16 is used as a copy management information reading circuit (a reading circuit 17 for reading copy management information from the TOC data area and a header of the data sector, respectively). 18), the digital data is transmitted to the decompression decoding circuit 21 as it is, and the digital data from the decompression decoding circuit 21 is transmitted to the digital interface circuit 26 through the switch 22. The discrimination signal from the copy management information discrimination circuit 19 is sent to the protection signal generation circuit 20 and also to the switch 22 as a switching control signal. Other configurations and operations are described in FIG.
Therefore, the corresponding parts are denoted by the same reference symbols and description thereof is omitted.

In the example of FIG. 7, when the result of the determination indicates that copying is prohibited, the switch 22 is turned off by a switching control signal corresponding to the result of the determination.
Note that the generation-restricted bit CM of the copy management information is used.
_{Even when C} indicates that the disc is not the original disc and is of a generation for which copying is prohibited, the copy control information discriminating circuit 19 outputs a switching control signal for turning off the switch 22.

As a result, no digital video data is output from the digital interface circuit 26. Therefore, the digital data obtained by reproducing the signal recorded on the optical disk D (that is, the digital disk medium) is converted into another digital data. It is possible to prevent illegal copying in so-called digital dubbing in which digital data is recorded as it is on a disk medium.

On the other hand, in the configuration example of the embodiment of the present invention,
For example, digital video data recorded on an original digital recording medium is reproduced and D / A-converted into an analog video signal once, and this D / A-converted analog signal is passed through an analog interface having analog output and analog input terminals. The analog video signal is A / D converted again to digital video data for digital recording, or the analog video signal is digitally or analogly converted via an analog interface. Even when copying is to be performed, the protect signal generation circuit 20 generates a protect signal as shown in FIGS. 8, 10, and 12, which will be described later, and mixes it with an analog video signal by the mix circuit 24. To prevent illegal copying. So that it is.

First, referring to FIG. 8 and FIG. 9, digital video data recorded on a digital recording medium is reproduced and once D / A converted into an analog video signal. A description will now be given of the prevention of illegal copying in the case where the digital video data is converted back to digital video data and recorded digitally.

In the following description, the generation limit bit CM _{C of the} copy management information allows only one generation from the original to be copied (that is, the copied data can be reproduced from the second generation onward from the original). Can not)
The case will be described as an example.

That is, in the reproducing apparatus 50 for the optical disk D shown in FIG.
Whether the bit CM _M of said copy management information is instructs to prohibit copying only the analog and digital or digital, also the bit CM _C performs some discrimination copy generation restriction is instructed what th generation The discrimination signal corresponding to these discrimination results is output from the protection signal generation circuit 20.
Sent to

Here, the bit CM of the copy management information is described.
_{When M} does not indicate prohibition of analog copy and the bit CM _{C of the} generation limit indicates that the disc is an original disc, the protection code signal generation circuit 74 in the protection signal generation circuit 20 outputs Protection code signal PC which indicates the effect by encoding with a plurality of bits
S is generated and output.

The protect code signal PCS is sent to the mix circuit 24. In the mix circuit 24, as shown in FIG. 8, during a predetermined horizontal period of the vertical blanking period of the analog video signal,
Mix CS. Note that the protection code signal PC
S is inserted, for example, during the 20Hth (H indicates a horizontal period) in an odd field and in the 283H horizontal period in an even field. The protection code signal PCS mixed with the analog video signal is composed of, for example, 14-bit data and a 6-bit error detection code (CRCC), and is composed of an 8-bit data following a 4-bit header in the 14-bit data. Are assigned in the same manner as the copy management information. An analog video signal to which the protection code signal is added is output from an analog output terminal 29.

The analog output terminal 29 of the reproducing apparatus 50
And an optical disk recording / reproducing device 8 using an optical disk RD recordable on a recording medium as an example of a video recording / reproducing device
0 and the analog input terminal 81 of the playback device 5
The analog video signal to which the program code signal output from the analog output terminal 29 is added to the analog video signal is subjected to A / D conversion by the disk recording / reproducing device 80 to obtain digital video data. Shall be recorded. That is,
The recording in this case is a first generation copy from the original disc.

In the optical disk recording / reproducing device 80, the analog video signal supplied through the analog input terminal 81 is converted into digital video data by the A / D conversion circuit 82. The digital video data is sent to a compression coding circuit 83, where it is subjected to compression coding according to the MPEG2 standard and a predetermined data amount unit such as 2
It is sectorized in units of 048 bytes. The data that has been compression-encoded and sectorized by the compression-encoding circuit 83 is
The signal is sent to the scramble circuit 85.

On the other hand, the analog video signal to which the protect code signal supplied to the analog input terminal 81 is added is also sent to a protect code signal detecting circuit 88. The protection code signal detection circuit 88 detects the presence or absence of the protection code signal added during the vertical blanking period of the analog video signal and the state of the protection code signal as shown in FIG.
New copy management information is generated based on the detected protection code signal.

Here, the protection code signal supplied to the protection code signal detection circuit 88 at this time indicates that it is from the original disk.
As described above, the copy of the first generation from the original is permitted.

Therefore, the protection code signal detection circuit 88 sets the generation limit bit CM _{C of the} copy management information.
Is changed to a value indicating that it is the first generation from the original disc and output.

The copy management information from the protect code signal detection circuit 88 is sent to a scramble circuit 85 and a copy management information adding circuit.

The scramble circuit 85 scrambles the output data from the compression coding circuit 83 based on the copy management information from the protect code signal detection circuit 88 in the same manner as the scramble circuit 9 in FIG. Is applied. The scrambled data from the scramble circuit 85 is sent to the copy management information adding circuit. In addition, instead of this scramble circuit 85,
An encryption circuit may be used.

The copy management information adding circuit, as described above,
It has an additional circuit 86 for adding the copy management information in the TOC and an additional circuit 87 for adding the copy management information in the header of the data sector. The scrambled data to which the copy management information is added by the copy management information adding circuit as described above is sent to the encoder / modulation circuit 89.

The encoder / modulation circuit 89 adds a parity to the supplied data by performing data delay and parity calculation as error correction coding processing, and adds, for example, 16 bits of 8-bit data according to a predetermined modulation method. The data is converted into channel-bit modulated data, and a synchronization signal having a so-called out-of-rule pattern that breaks the modulation rule of the predetermined modulation method is added in a predetermined data amount unit. send.

The optical head device 90 drives a laser that is driven based on data supplied from an encoder / modulation circuit 89 on a recordable optical disk RD that is rotated by a spindle motor 91 that is under rotational servo control. Optical recording is performed by irradiating light. Note that the recording on the optical disk RD may be so-called magneto-optical recording. In the case of performing the magneto-optical recording, the recording may be performed at a position facing the optical head device 90 with the optical disk RD interposed therebetween. An optical disk R provided with a magnetic head
A laser beam having a power sufficient to raise the magnetic film formed on D above the Curie temperature is irradiated from the optical head device 90, and the magnetic head is rotated by the encoder / modulation circuit 8
9 to be driven based on the signal. As a result, the digital video data generated from the original video data is copied from the original video data to the optical disk RD via the analog interface.

Next, the optical disk RD on which digital video data is copied from the original disk as described above is reproduced, D / A converted into an analog video signal once, and the analog video signal is again A / D converted. When the digital video data is converted back to digital video data and recorded on another recordable optical disc RD (that is, the second generation copy is performed), the second generation copy is performed as follows. The data cannot be reproduced from the optical disk RD even if the recording is performed. That is, for example, the disk RD on which the first generation copy has been made is loaded again into the reproducing device 50 of FIG. 9 and reproduced, and the analog video signal obtained by this reproduction is transmitted to the optical disk recording / reproducing device 80 of FIG. In the case where copying is performed again (that is, the second generation copy is performed), the following is performed.

That is, in the reproducing apparatus 50, the above 1
The data read from the optical disc RD on which the generation copy has been made is sent to copy management information reading circuits 17 and 18 in the same manner as described above, and these read circuits 17 and 18 are read.
The copy management information extracted by 18 is sent to a copy management information determination circuit 19.

The decision signal from the copy management information discriminating circuit 19 is sent to a protect signal generating circuit 20, and the protect signal generating circuit 20
CS is output and sent to the mix circuit 24. As described above, the mix circuit 24 performs the de-scramble processing in the de-scramble circuit 31 and then processes the data in the decompression / decoding circuit 21.
Supplies an analog video signal that has been D / A converted. The protection code signal PCS is mixed with the analog video signal by the mixing circuit 24,
An analog video signal mixed with the protection code signal PCS is output via an analog output terminal 29.

The analog output terminal 29 of the reproducing apparatus 50
Is the analog input terminal 8 of the optical disk recording / reproducing device 80
1, the analog video signal to which the program code signal output from the analog output terminal 29 of the reproducing apparatus 50 is added is input via the analog input terminal 81 of the disk recording / reproducing apparatus 80. .

In the optical disk recording / reproducing device 80, the analog video signal supplied via the analog input terminal 81 is converted into digital video data by the A / D conversion circuit 82, and the compression encoding circuit 8
At 3, compression encoding and sectorization are performed, and this data is sent to the scramble circuit 85.

On the other hand, the analog video signal supplied with the protect code signal supplied to the analog input terminal 81 is also sent to a protect code signal detecting circuit 88.

Here, the protection code signal supplied to the protection code signal detection circuit 88 at this time indicates that it is from the optical disk on which the first generation copy has been made. At this time, the protection code signal detection circuit 88 changes the generation limit bit CM _C of the copy management information to a value indicating that it is the second generation from the original disk and outputs it.

The copy management information from the protect code signal detection circuit 88 is sent to a scramble circuit 85 and a copy management information adding circuit. In the same manner as described above, the scramble circuit 85 scrambles the output data from the compression encoding circuit 83 based on the copy management information from the protect code signal detection circuit 88. The copy management information is added to the data that has been subjected to the scramble processing and output.

When an encryption circuit is used in place of the scramble circuit 85, the protect code signal detection circuit 88 outputs a control signal for controlling the encryption circuit to perform encryption. . At this time, this control signal can be used as key information for encryption. As a result, the encrypted digital video data is output from the encryption circuit.

The data output from the copy management information adding circuit is sent to an optical head device 90 or a magnetic head after being subjected to error correction encoding processing and modulation data processing in an encoder / modulation circuit 89. Optical or magneto-optical recording is performed on the optical disk RD in the same manner as described above.

Next, the optical disk RD on which the second-generation copy has been made as described above is read by the optical head device 90 of the optical disk recording / reproducing device 80, and the read data is read by the optical disk recording / reproducing device. Sent to the playback system at 80.

The digital reproduction circuit 92 of the reproduction system includes the same main components as the RF circuit 12, demodulation circuit 14, error correction circuit 15, sector decomposition circuit 16, and decompression decoding circuit 21 as in the reproduction apparatus 50, as well as the above. It has a copy management information reading circuit, a copy management information discrimination circuit 19, a descramble circuit 31, and the like.

The copy management information determination circuit of the digital reproduction circuit 92 determines the generation limit bit CM _C of the copy management information read from the optical disk RD, and thereby the optical disk RD performs the second generation copy. Know that it was done. At this time, the copy management information determination circuit 19 of the digital reproduction circuit 92 does not output, for example, copy management information to the de-scramble circuit 31 (or outputs copy management information that cannot be descrambled). .

Thus, the digital reproduction circuit 92
The data sent to the expansion / decoding circuit 21 is data that has not been subjected to the descrambling process. Therefore, even if the data is subjected to the expansion / decoding processing by the expansion / decoding circuit 21, the normal digital video data Will not be obtained. Therefore, even if the data output from the digital reproduction circuit 92 is converted into an analog signal by the D / A conversion circuit 93 and sent to, for example, the television receiver 71 via the analog output terminal 94, a normal image is output. Will not be obtained.

As described above, according to the above configuration, the digital video data recorded on the original digital recording medium is reproduced, D / A converted once into an analog video signal, and this analog video signal is again converted into an analog video signal. / D
In the case where the digital video data is converted to digital video data and recorded digitally, generation restriction can be performed, and illegal copying can be prevented. That is, in the above-described example, it is possible to record data on the optical disc RD also in the second generation, but since the recorded data is not descrambled, it is reproduced and reproduced by the television receiver. Even if the image is projected on the image 71, a normal image cannot be obtained, and as a result, illegal copying is prevented.

Also, in the case of digital copying via this analog interface, as described above,
Even if the copy management information is skipped for the purpose of illegal copying when the optical disc RD is reproduced by the reproducing apparatus 50, the scramble processing based on the copy management information is performed on the digital data recorded on the optical disc RD. Since the descrambling circuit 31 cannot perform descrambling, and the protect code signal generating circuit 74 cannot generate a protect code signal based on the copy management information, the illegal scramble operation is performed. Can be prevented. That is, since the optical disc recording / reproducing apparatus 80 cannot generate copy management information based on the protect code signal, the scramble circuit 85 cannot descramble the scramble, so that illegal copying can be prevented. For the purpose of illegal copying, instead of skipping the copy management information, for example, it is conceivable to mask the protect code signal.
Cannot be descrambled by the scramble circuit 85, so that illegal copying can be prevented.

In the above-described example, an example is given in which the first generation copy from the original disk is permitted, but the generation limit bit CM _C of the copy management information is set to 1
If the value of the copy of the generation is also prohibited, the copy of the first generation from the original disc can be prevented.

Further, in the above example, the recording / reproducing device 80
Although an example is described in which an optical disc RD that can be recorded as is used, it is needless to say that the same copy protection can be performed by a device that can record and reproduce digital video data on a video tape TP.

Next, in the above-described example, the digital video data recorded on the original digital recording medium is reproduced and once D / A converted into an analog video signal, and the analog video signal is converted into a digital video signal again by A / A conversion. D
Although the case of conversion and digital recording has been described, illegal copying can be prevented even when analog video signals are recorded as they are.

Hereinafter, referring to FIGS. 10 and 11, for example, the digital video data recorded on the original digital recording medium is reproduced and once converted into an analog video signal.
A / A conversion and the prevention of illegal copying in the case of analog recording of this analog video signal with, for example, a conventional analog video tape recorder (analog VTR) will be described.

That is, in this case, in the reproducing apparatus 50 for the optical disk D shown in FIG.
_M indicates prohibition of analog copy, and when the discrimination signal from the discrimination circuit 19 corresponds to the prohibition of analog copy, the protection pulse generation circuit 72 in the protection signal generation circuit 20 outputs a white peak signal. A certain analog protect pulse APP is generated, and the analog protect pulse APP is mixed in a predetermined period of the vertical blanking period of the analog video signal by the mix circuit 24 as shown in FIG. In addition, it is assumed that the protect pulse generating circuit 72 generates the analog protect pulse APP even when the copy management information is not supplied. Even when the generation-restricted bit CM _C indicated by the copy management information indicates that analog copy of the current generation is to be prohibited, the copy management information discrimination circuit 19 sets the analog copy to be prohibited. A corresponding determination signal is output. APS (Analog Pro)
tection System).

The output signal from the mix circuit 24 is
In the vertical blanking period of the analog video signal, a plurality of pairs of pseudo-sync pulses and positive pulses in a predetermined order are added to the video signal following the sync pulse. For example, in the specific example of FIG. 10, between the two equalizing pulses P ₁₀ in one line (one horizontal period), pseudo sync pulses P ₁₂ and positive pulses (e.g., white peak pulse) pulse pairs with P ₁₄ is Multiple pairs are inserted. Japanese Patent Application Laid-Open No. Sho 61-288858 discloses a technique in which such a combination signal of a plurality of pseudo sync pulses and a plurality of white peak signals is used as a recording scramble signal. The APS using the pseudo-sync pulse (PSP) is also called a PSP system.

With such a recording scramble signal,
The reason why normal recording cannot be performed with a general video tape recorder (VTR) will be briefly described.

The analog output terminal 29 of the reproducing apparatus 50
And the analog input terminal 61 of the analog VTR 60, and the analog video signal to which the recording scramble signal output from the analog output terminal 29 of the playback device 50 is added is converted into a video tape TP by the analog VTR 60.
And record it in

Generally, the analog VTR 60 has an AGC function of an automatic amplitude adjusting means or an automatic gain control means.
(Automatic Gain Control) circuit 62. The AGC circuit 62 performs automatic amplitude adjustment on an analog video signal input through the analog input terminal 61. With respect to the analog VTR 60 including the AGC circuit 62, FIG.
When the analog video signal as shown in (1) is supplied, the AGC circuit 62 reacts to the white peak signal added during the vertical blanking period, thereby reducing the amplitude of the original video signal. That is, the AGC circuit 62 of a general video tape recorder uses the equalizing pulse P
₁₀ and the pseudo sync pulse P ₁₂ cannot be distinguished, and
GC circuit 62 samples the level of the positive pulse P ₁₄ which is added, recognizes erroneously that the input signal level is several times the normal performs control so as to reduce the gain. Therefore,
The analog video signal having been subjected to automatic amplitude adjustment by the AGC circuit 62 is recorded on a video tape TP via an analog recording circuit 65, and thereafter, the video tape TP is reproduced by an analog reproducing circuit 67, and an analog output terminal 6
When the image is projected on the television receiver 70 via the display 8, the image becomes very unsightly, for example, the brightness of the reproduced image is abnormal.

Thus, in the case where digital video data recorded on the original digital recording medium is reproduced and D / A converted once into an analog video signal, and this analog video signal is analog-recorded by a conventional analog VTR, Can be prevented including generational restrictions.

Also, in the case of analog copying via this analog interface, even if the copy management information is skipped for the purpose of illegal copying when the optical disk RD is reproduced by the reproducing device 50 as described above, Since the digital data recorded on the optical disc RD has been subjected to scramble processing based on the copy management information, the descramble circuit 31
In this case, the scramble cannot be released, and the protect code signal generation circuit 74 generates a protect pulse even when the copy management information is not supplied, so that illegal copy can be prevented.

In the example of the analog VTR 60 shown in FIG. 11, the reaction of the AGC circuit 62 by the analog protect pulse APP is used.
A detection circuit 63 for detecting an analog protect pulse APP from an analog video signal supplied via the analog input terminal 61 is provided for R60.
A switch 64 may be provided, for example, at the subsequent stage of the GC circuit 62, and when the analog protect pulse detection circuit 63 detects the analog protect pulse APP, the switch 64 is turned off. It is possible to prohibit. That is, if the switch 64 is turned off, the analog video signal supplied to the analog input terminal 61 cannot be recorded on the video tape TP, so that illegal copying can be prevented.

In the above configuration example, the video tape T
Although the description has been made using the analog VTR using the P, it goes without saying that the above-described copy protection method of the present invention can be used in an analog video disk recording / reproducing apparatus using the analog video disk AD.

Further, according to the present invention, as shown in FIGS. 12 and 13, the analog video signal as described above is A / D converted again, transmitted through an analog interface, and then converted back to digital video data. Illegal copying can be prohibited both in the case where digital recording is performed by digital recording and in the case where the analog video signal is transmitted via an analog interface and analog recording is performed as it is.

That is, in the optical disk D reproducing apparatus 50 shown in FIG.
A determination circuit 71 for determining the state of the bit CM _M of the copy management information; and a bit CM _{C of the} copy management information.
The determination signals from the determination circuits 71 and 73 are sent to the protect signal generation circuit 20, and the copy management information is sent to the de-scramble circuit 31 and the digital scramble circuit 32.

The de-scramble circuit 31 and the digital scramble circuit 32 perform the same processing as described above.

Further, the protect signal generating circuit 20 generates the analog protect pulse APP based on the discriminating signal from the discriminating circuit 71 and the protect signal generating circuit 72 based on the discriminating signal from the discriminating circuit 73. And a protection code signal generation circuit 74 for generating a protection code signal PCS. The analog protect pulse APP from the protect pulse generating circuit 72 and the protect code signal PCS from the protect code signal generating circuit 74 are:
The signal is sent to the mix circuit 24.

As a result, as shown in FIG. 12, the mix code 24 mixes the protect code signal PCS during a predetermined period of the blanking period of the analog video signal, and outputs a plurality of pseudo sync pulses (pseudo sync pulses). A signal in which a plurality of white peak signals are combined on the equivalent pulse is output.

An analog video signal to which the protect code signal APP and the analog protect pulse APC are added is output from an analog output terminal 29.

The analog output terminal 29 of the reproducing apparatus 50
Is an analog input terminal 81 of an optical disk recording / reproducing device 80 using a recordable optical disk RD, and an analog V
The analog VTR 60 records the analog video signal on a video tape TP, and the optical disk recording / reproducing device 80 converts the analog video signal into digital video data. After that, the data is recorded on the optical disc RD. Since the recording / reproducing operation in the analog VTR 60 and the optical disc recording / reproducing device 80 is the same as described above, the description thereof is omitted here. However,
In the optical disk recording / reproducing device 80, the protect code signal detecting circuit 88 detects the protect code signal PC.
In addition to the detection of S, the analog protect pulse APP is also detected. When the analog protect pulse APP is detected, the scramble process is performed by the scramble circuit 85, thereby preventing illegal copying.

Next, still another embodiment of the present invention will be described. Various specific examples of the copy management information shown in FIG. 2, the specific example of the scramble circuit shown in FIG. 3, and the specific examples of the sector format shown in FIG. 5 and FIG. .

For example, FIG. 14 shows another specific example of the copy management information. Among the 8 bits b7 to b0, for example, the bits b7 and b6 on the upper side limit the generation of the copy. System CGMS (Copy Generat
allocated as information bits CM _C of the ion Management System), assigned as a trigger bit CM _T of APS bit of the next b5 and b4 are for example described above (Analog Protection System), the next bit b3 is whether analog source Bit CM _A shown in FIG. The remaining b2 to b0 are undefined. Here, the bits (b7, b6) of the CM _C are, for example, (0, 0)
Indicates copy-free, (1,0) indicates one-generation copy permitted, and (1,1) indicates copy prohibited.
(0, 1) is unused. The APS trigger bits CM _T bits (b5, b4) are, for example (0,
0) indicates off, and (0, 1) indicates the PS
Turn on P (Pseudo-Sync Pulse),
It indicates that a split burst (or color stripe) described later is to be turned off. At (1, 0), the PSP is turned on. At the time of (1, 1), the PSP is turned on. This indicates that a 4-line split burst is turned on. The bit b3 of the CM _A indicates 1 when the analog package medium is set, and 0 when the bit b3 indicates the other.

When the contents of the APS trigger bit CM _T are PSP ON, the analog protect pulse APP as shown in FIG. 10 or FIG. 12 is applied during a predetermined period within the vertical blanking period, for example, 12H to 19H. Means to insert it. Turning on the split burst means that the color burst provided at a position after the horizontal synchronization pulse in the horizontal blanking period is partially inverted,
Two-line split burst-on means that color burst inversion is performed continuously for two lines every 17 lines, and four-line split burst-on means that color burst is inverted continuously for four lines every 21 lines. Respectively. In addition, the color burst inversion is an operation of inverting a part of the first half of the color burst signal or changing the phase, for example. On the other hand, color disturbance such as color stripe generation is caused.

FIG. 15 is a diagram for explaining the above-described inverted split color burst APS. In the line where the above-mentioned color burst inversion is performed, it is arranged at a position after the horizontal synchronizing pulse HD. Color burst C serving as a reference signal of a color subcarrier (color subcarrier)
The phase of a part of B, for example, the shaded portion in the figure is inverted. That is, a color burst period C _N, for example, 9 cycles in a standard NTSC system, the burst signal as a pre-section C _P for example two cycles is in a forward position than the color burst standard interval C _N is connected, All 11
The color burst of the cycle. The two-cycle and 5.5 cycles of the burst phase of the first half front section C _F of 3.5 cycle of the color burst in the standard section C _N pre section C _P is inverted, the remaining color burst standard interval C _N 5.5 cycles of back section C _B of the second half portion of the inner is as it is.

Such a color burst signal partially inverted in phase is generated, for example, by the protect pulse generation circuit 72 shown in FIGS. 11 and 13 and sent to the mix circuit 24. When the two-line split burst is turned on, , 1
Phase-inverted color bursts may be mixed for two consecutive lines every seven lines, and when the four-line split burst is on, four consecutive lines may be mixed for every 21 lines.

The operation of the split burst is not limited to a change of 180 degrees such that the phase of a part of the color burst is inverted, and the operation of the phase is 90 degrees or 270 degrees.
The angle may be changed by an arbitrary degree or an arbitrary angle. The section to be changed is not limited to 5.5 cycles, but can be set arbitrarily.

Next, FIG. 16 shows another specific example of the scramble circuit which is a substitute for the specific example of the scramble circuit shown in FIG. In the specific example of FIG. 16, the 15-bit scramble shift register 41 uses an exclusive OR (ExOR) circuit 42 to generate a generator polynomial x ¹⁵ +.
The point that feedback according to x ⁴ +1 is applied is different from the specific example of FIG. 3 described above, and the other configuration is the same. Therefore, the corresponding parts are denoted by the same reference symbols and description thereof is omitted.

Next, instead of the specific examples of the sector formats shown in FIGS. 5 and 6, a sector format as shown in FIG. 17 can be used.

In the example of FIG. 17, one sector corresponds to one row and one sector.
It is composed of 12 rows of 72 bytes, that is, 2064 bytes, and includes 2048 bytes of main data. In the head position of the first line of the 12 lines, a 4-byte ID
(Identification data), a 2-byte IED (ID error detection code), and a 6-byte RSV (spare) are arranged in this order, and a 4-byte ED is located at the end position of the last row.
C (error detection code) is arranged.

As shown in FIG. 18, the four bytes of the ID (identification data) are the first byte (bit b) on the MSB side.
31 to b24) are composed of sector information, and the remaining three bytes (bits b23 to b0) are composed of sector numbers.
The sector information includes, in order from the MSB, 1-bit sector format type, 1-bit tracking method, 1-bit reflectivity, 1-bit spare, 2-bit area type, and 2-bit layer number. I have.

The copy management information may be provided at a predetermined position in such a sector format. For example, in the sector format in the data area,
One byte in the 6-byte RSV is used, and in the TOC area sector format, several bytes or tens of bytes of the main data portion may be collectively used as an area for copy management information.

In the above-described configuration example, recording and reproduction on an optical disk or a video tape have been described as an example. However, the present invention can be applied to the transmission of digital data. For example, a part of the transmission control information similar to the copy management information is encrypted (scrambled) to digital data transmitted as key information, and the transmission control information is appended to the encrypted digital data. By transmitting the information, illegal copying can be prevented.
As a signal transmission apparatus corresponding to the signal transmission method of the present invention, for example, in the configuration of FIGS. 1, 9, 11, and 13, the encoder / modulation circuit performs encoding and modulation processing according to the transmission method. The present invention can be applied as it is if the optical head device for recording and reproduction, the interface means with the outside, and the like are changed to data transmitting means and receiving means.

In the above-described example, only the scramble / de-scramble is described in the encryption processing. However, it goes without saying that other conversion processing may be possible. Further, the conversion processing on the recording side in FIG. 1 is performed in the scramble circuit 9, but may be performed in the compression encoding circuit 2 and the encoder / modulation circuit 6. In this case, the demodulation circuit 14 and the error correction circuit 1 also perform the conversion process on the reproduction side instead of the descramble circuit 31.
5, the sector decomposition circuit 16 and the decompression decoding circuit 21 perform the processing. When performing any of the demodulation circuit 14, the error correction circuit 15, the sector decomposition circuit 16, and the decompression decoding circuit 21, the information for performing the determination by the copy management information determination circuit 19 is obtained before that. Need to be. In this case, for example, since the TOC information is obtained first, the information from the TOC information can be used.

As described above, according to the configuration example of the embodiment of the present invention, it is possible to simultaneously take measures against illegal copying for both analog copying and digital copying.

As described above, according to the signal reproducing method and apparatus according to the embodiment of the present invention, a predetermined position on a signal recording medium on which digital data is recorded, for example, a reproduction mode control signal area, and / or Preventing illegal copying by subjecting digital data and / or analog signals obtained by D / A conversion of the digital data to predetermined conversion processing based on the recording control information arranged in each header section of the sectorization. can do.

Further, according to the signal recording method and apparatus of the embodiment of the present invention, at least a part of recording control information for managing recording on a signal recording medium is used as key information to encrypt a signal or to perform recording control. A signal is encrypted by key information indicated by at least a part of the information, and the recording control information is converted to a reproduction mode control signal area portion of the signal recording medium and / or a predetermined position of each recording unit of the signal to the signal recording medium. And recording it together with the encrypted signal on a signal recording medium, it is possible to prevent illegal copying.

Further, according to the signal transmission method and apparatus according to the embodiment of the present invention, the digital data and / or the digital data based on the transmission control information for managing the transmission accompanying the transmitted digital data. By performing a predetermined conversion process on an analog signal obtained by performing D / A conversion of, the illegal copy can be prevented.

Further, the signal transmission method and apparatus according to the embodiment of the present invention provide a method of encrypting a signal using at least a part of transmission management information for managing signal transmission as key information, or at least one of recording control information. By encrypting the signal with the key information specified by the unit and transmitting the transmission control information along with the encrypted signal, illegal copying can be prevented.

Further, according to the signal recording medium in the embodiment of the present invention, the recording control information for managing the recording of the signal on the signal recording medium is stored in the reproduction mode control signal area section and / or the signal By arranging and recording at a predetermined position of each recording unit and encrypting and recording a signal using at least a part of the recording control information as key information, illegal copying can be prevented.

That is, according to the embodiment of the present invention,
For example, a predetermined conversion process is performed on both the digital data and the analog signal based on the recording control information or the transmission control information. In addition, by performing scramble processing, illegal copying for both digital copying and analog copying is prevented. Further, according to the embodiment of the present invention, since the signal is encrypted based on the recording control information or the transmission control information, the encryption can be decrypted if the recording control information or the transmission control information is skipped and reproduced. Therefore, illegal copying can be prevented.

Further, according to the video signal reproducing apparatus and method of the embodiment of the present invention, together with the digital video signal, the reproduction mode control signal area provided at the beginning of the spiral recording track, and / or the sectorization A recording control code for preventing illegal copying arranged in each header portion of a recorded digital video signal is used to reproduce a digital signal from a digital disk medium on which recording is performed, and to obtain at least an analog video signal output at least finally An analog video output obtained by converting the digital video signal by detecting a state of the video recording control code, generating a video scramble signal and / or a video recording inhibition signal in the form of an analog video signal based on the detected output. Adding the recording scramble signal and / or the recording prohibition signal to a predetermined area of the signal vertical retrace period, By outputting the analog video signal, it is possible to prevent illegal copying.

Further, according to the apparatus and method for combining video reproduction and recording in the embodiment of the present invention, a digital disk medium on which the digital video signal and the recording control code are recorded is reproduced, and at least analog video is recorded. A combined video signal reproduction and recording apparatus and method for outputting and recording a signal, comprising: generating a recording scramble signal in the form of an analog signal based on a state detection output of a recording control code, and converting a digital video signal. The recording scramble signal is added to a predetermined area of the vertical retrace period of the obtained analog video signal and output, and the amplitude is adjusted by automatic amplitude adjustment means that responds to the recording scramble signal included in the input analog video signal. Since the input analog video signal is recorded on an analog recording medium, It is possible to prevent copying.

Further, according to the apparatus and method for combining video signal reproduction and recording according to the embodiment of the present invention, a recording prohibition signal in the form of an analog video signal is generated based on the state detection output of a recording control code, A video inhibit signal is added to a predetermined area of the vertical blanking period of the analog video signal obtained by converting the video signal, and is output. Also, when the input analog signal is recorded in an analog or digital manner, it is included in the input analog signal. By operating the recording prohibition means in response to the recording prohibition signal, illegal copying can be prevented.

Further, the digital disk medium according to the embodiment of the present invention is intended to cope with the video signal reproducing method according to the embodiment of the present invention, and includes a recording scramble together with a digitized video signal. By recording the recording control code, which is a signal that functions to generate a signal and / or a recording prohibition signal, illegal copying can be prevented.

That is, according to the embodiment of the present invention,
In outputting an analog video signal obtained by D / A converting a digital video signal read from a digital disk medium, a recording scramble signal and / or a recording prohibition signal in the form of an analog video signal are added to the analog video signal. In addition, an analog video signal to which the recording scramble signal and / or the recording prohibition signal is added is recorded in a recording medium in an analog or digital manner. As a result, the video signal reproduced from the analog or digital disk medium after the recording is scrambled, or the recording itself is not performed.

In the above description, an optical disk and a video tape are described as signal recording media. However, other semiconductor storage media such as so-called IC cards and various memory devices, and magnetic disk media such as a hard disk and a flexible disk. It is also possible to use optical discs, in addition to optical discs on which recording is performed using pits, magneto-optical discs, phase-change optical discs, organic dye optical discs, optical discs on which recording is performed by ultraviolet laser light, and multilayer recording. Various types of disks such as an optical disk having a film can be used, and the tape-shaped recording medium is not limited to a video tape, and can be applied to various other types.

[0129]

According to the present invention, based on the recording control information arranged at a predetermined position of a signal recording medium on which digital data is recorded, for example, a reproduction mode control signal area section and / or each header section for sectorization. A plurality of white peak signals or a combination signal of a plurality of pseudo sync pulses and a plurality of white peak signals is converted into an analog video signal in an analog signal obtained by D / A conversion of the digital data. By performing a process of arranging over a plurality of horizontal periods in the vertical blanking period of the video signal, the digital data is once converted to an analog signal, and this is prohibited from being illegally copied in an analog or digital manner,
It is also possible to prohibit stepwise generation copying, and furthermore, it is possible to take measures against illegal copying at the same time for both analog copying and digital copying.

Further, in the present invention, the digital video signal, the reproduction mode control signal area provided at the beginning of the recording track, and / or the recording control provided in each header of the sectorized digital video signal. When a digital disk medium on which a code is recorded is reproduced and at least an analog video signal is output, a plurality of recording scramble signals in the form of an analog video signal are generated based on the detection output of the state of the recording control code. The scrambled video signal is generated in a predetermined area of a vertical blanking period of an analog video signal obtained by converting a digital video signal by generating a white peak signal or a combination signal of a plurality of pseudo sync pulses and a plurality of white peak signals. And outputs the analog video signal to copy the digital disk medium. When performing, since the analog video signal to which the recording scramble signal is added is recorded in analog or digital, the video signal reproduced from the analog or digital disk medium after recording is scrambled. It will be. Therefore, according to the present invention, it is possible to temporarily convert a digital video signal recorded on a digital disk medium into an analog video signal, and to prohibit illegal or analog or digital copying of the digital video signal. Can also be banned.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a master disk manufacturing step and a reproduction step of a duplicated disk.

FIG. 2 is a diagram for describing copy management information.

FIG. 3 is a circuit diagram showing a specific configuration of a scramble circuit.

FIG. 4 is a diagram for explaining the structure of an optical disc.

FIG. 5 is a diagram illustrating a configuration of a data sector.

FIG. 6 is a diagram for explaining a configuration of a TOC sector;

FIG. 7 is a diagram for explaining another example of a master disk manufacturing process and a reproduction process of a duplicated disk.

FIG. 8 is a waveform diagram showing a state where a protect code signal is added to an analog video signal.

FIG. 9 is a block circuit diagram showing a configuration for converting digital video data into an analog video signal, and further converting the digital video data into digital video data to prevent illegal copying when copying.

FIG. 10 is a waveform diagram showing a state where an analog protect pulse is added to an analog video signal.

FIG. 11 is a block circuit diagram showing a configuration for converting digital video data into an analog video signal and preventing illegal copying when copying the analog video signal in an analog manner.

FIG. 12 is a waveform diagram showing a state in which an analog protect pulse and a protect code signal are added to an analog video signal.

FIG. 13 is a block circuit diagram showing a configuration for converting digital video data into an analog video signal and preventing illegal copying when copying it in an analog and digital manner.

FIG. 14 is a diagram illustrating another specific example of copy management information.

FIG. 15 is a diagram illustrating a color burst inversion process.

FIG. 16 is a circuit diagram showing another specific configuration of the scramble circuit.

FIG. 17 is a diagram for explaining another specific example of the sector format.

18 is a diagram for explaining a configuration example of a sector header of the sector format of FIG. 17;

[Explanation of symbols]

9 scramble circuit, 17 copy management information reading circuit in TOC, 18 copy management information reading circuit in data sector header, 19 copy management information discriminating circuit, 20 protect signal generation circuit, 24
Mix circuit, 31 de-scramble circuit, 3
2 Digital scramble circuit, 62 AGC circuit,
72 protection pulse generation circuit, 74 protection code signal generation circuit, 86 copy management information addition circuit in TOC, 87 copy management information addition circuit in data sector header, 88 protect code signal detection circuit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-111634 (JP, A) JP-A-2-239468 (JP, A) JP-A-6-54289 (JP, A) JP-A-6-54289 70282 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) H04N 5/91-5/956 H04N 9/79-9/898 G11B 20/10-20/12

Claims (12)

(57) [Claims] 1. A video signal which has been digitized and encrypted with key information, and a reproduction mode control signal area section provided at the beginning of a recording track for controlling the mode of the reproduction state.
And / or reproducing the optical digital disk medium on which the recording control code and the key information including the recording prohibition signal and the recording generation restriction instruction signal arranged in each header portion of the digital video signal which is divided into sectors are recorded. A video signal reproducing method for outputting at least an analog video signal, wherein a state of the recording control code and / or the key information arranged in a reproduction mode control signal area section and / or each header section of the optical digital disk medium And decrypting the encryption applied to the video signal using the detected key information, converting the encrypted digital video signal into an analog video signal, Based on the detected recording control code, at least a recording scramble signal in the form of an analog video signal and a new Generating a new generation restriction instruction signal, adding the recording scramble signal and the new generation restriction instruction signal to a predetermined area of a vertical retrace period of the converted analog video signal, A video signal reproducing method for an optical digital disk medium, comprising outputting an analog video signal to which a generation restriction instruction signal is added. 2. The recording scramble signal comprises a combination signal of a plurality of pseudo sync pulses and a plurality of white peak signals, and the combination signal is used as 12H to 19H (H is within a vertical blanking period of the analog video signal). 2. The video signal reproducing method according to claim 1, wherein the video signal is inserted during a horizontal period. 3. The video signal reproducing method according to claim 1, wherein the new generation restriction instruction signal is provided at 20H and / or 283H (H is a horizontal period) in the analog video signal. 4. The generation restriction instruction signal provided on the signal recording medium is 2-bit copy generation management information.
Copy free when (0,0), 1 when (1,0)
2. The video signal reproducing method according to claim 1, wherein generation copy is permitted, and copy prohibition is indicated when (1, 1). 5. A new generation restriction instruction signal provided in the analog signal is 2-bit copy generation management information, and is copy free when (0, 0) and 1 when (1, 0). 2. The video signal reproducing method according to claim 1, wherein generation copy is permitted, and copy prohibition is indicated when (1, 1). 6. A coded signal arranged in the analog signal includes a plurality of bits of copy management information, and when a predetermined information bit of the copy management information is at least (1, 1), copy is prohibited. 2. The video signal reproducing method according to claim 1, wherein: 7. A video signal digitized and encrypted by key information, and a reproduction mode control signal area section provided at a start end of a recording track for controlling a mode of a reproduction state;
And / or reproducing the optical digital disk medium on which the recording control code and the key information including the recording prohibition signal and the recording generation restriction instruction signal arranged in each header portion of the digital video signal which is divided into sectors are recorded. A video signal reproducing apparatus for outputting at least an analog video signal, wherein a state of the recording control code and / or the key information arranged in a reproduction mode control signal area portion and / or each header portion of the optical digital disk medium Detecting means for detecting the video signal; decoding means for decoding the encryption applied to the video signal using the detected key information; and converting the encrypted digital video signal into an analog video signal. D / A conversion means for converting, and at least a recording scramble signal in the form of an analog video signal and a new Generating means for generating a new generation restriction instruction signal, and adding means for adding the recording scramble signal and the new generation restriction instruction signal to a predetermined area of a vertical blanking period of the D / A converted analog video signal. And an output means for outputting an analog video signal to which the recording scramble signal and the new generation restriction instruction signal are added. 8. The recording scramble signal comprises a combination signal of a plurality of pseudo sync pulses and a plurality of white peak signals, and the combination signal is used as a signal between 12H to 19H (H is a vertical retrace period of the analog video signal). 8. The video signal reproducing apparatus according to claim 7, wherein the video signal is inserted during a horizontal period. 9. The video signal reproducing apparatus according to claim 7, wherein the new generation restriction instruction signal is provided at 20H and / or 283H (H is a horizontal period) in the analog video signal. 10. The generation restriction instruction signal provided on the signal recording medium is 2-bit copy generation management information.
Copy free when (0,0), 1 when (1,0)
8. The video signal reproducing apparatus according to claim 7, wherein generation copy is permitted, and (1, 1) indicates copy prohibition. 11. A new generation restriction instruction signal provided in the analog signal is 2-bit copy generation management information, and is copy free when (0,0) and 1 when (1,0). 8. The video signal reproducing apparatus according to claim 7, wherein generation copy is permitted, and (1, 1) indicates copy prohibition. 12. The coded signal arranged in the analog signal includes a plurality of bits of copy management information,
8. The video signal reproducing apparatus according to claim 7, wherein when a predetermined information bit of the copy management information is at least (1, 1), copy inhibition is indicated.