JP2003244635A - Video signal reproduction method and apparatus, signal transmission method and apparatus, and apparatus and method for combining video signal reproduction and recording - Google Patents

Abstract

(57) Abstract: A digital disk medium is reproduced to obtain an analog video signal in which illegal copying is prevented. SOLUTION: An encrypted video signal digitally scrambled with key information, a recording control code for controlling a state of a reproduction state, and key information are recorded on an optical disc D. When reproducing this optical disc, the key information and the state of the recording control code are detected, and the encrypted video signal is de-scrambled by the de-scramble circuit 31 using the detected key information, and is converted from digital data. In response to the detected analog video signal, an analog video signal whose illegal copy is prevented is output based on the detected recording control code. The initial value for de-scramble is set based on the detected key information.

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 copy of digital data and preventing illegal use, a signal transmitting method and apparatus, and a combination apparatus and method of video signal reproducing and recording. Regarding

[0002]

2. Description of the Related Art In recent years, with the increase in capacity and spread of digital recording media such as optical disks, 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. The fact is that the illegal copying has already caused harmful effects such as copyright infringement.

From the above, the original digital recording medium is recorded for the purpose of preventing the above-mentioned illegal copy in so-called digital dubbing in which the digital signal reproduced from the signal recorded in the digital recording medium is recorded again in the digital recording medium. Some have a predetermined ID bit recorded to prevent illegal copying.

For example, so-called R-DAT (Rotary hea)
As a method for preventing the above-mentioned illegal copy in a digital audio signal recording / reproducing apparatus called d Digital Audio Taperecoder, a digital audio signal recorded on a digital audio tape as a digital recording medium is recorded in a main data area of a digital audio signal. A prohibition code (so-called SCMS: prohibition code of the standard of serial copy management system) for prohibiting copy prohibition or stepwise generation copy (that is, generation restriction) is recorded, and the prohibition code is recorded by the digital audio signal recording device. When such 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, a video signal for reproducing, for example, a digital video signal recorded on a digital recording medium such as a digital disk or a digital tape, and recording the digital video signal on the digital recording medium again. 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 above-mentioned R-DAT is used.
Similarly to the method of preventing illegal copy between recording / reproducing apparatuses in the above, a predetermined ID bit (CGMS: copy prohibition management system standard prohibition code) for preventing illegal copy may be recorded on the original digital recording medium. Conceivable.

However, in the case of the method of recording a predetermined ID bit for preventing the illegal copy on the original digital recording medium, it works well for preventing the illegal copy in the digital dubbing described above. In the case where the digital video signal recorded on the original digital recording medium is reproduced and once D / A converted into the analog video signal and the analog video signal is analog-recorded, the analog video signal is converted into the digital video signal again. In the case of A / D conversion and digital recording, the illegal copy preventing function does not work and the recording can be performed as it is.

That is, as described above, the digital video signal recorded on the digital recording medium is reproduced and D /
Even when A-converted and the analog video signal is analog-recorded as it is, or when A / D-converted and converted back to a digital video signal to be digitally recorded,
Since the quality of the video signal after dubbing is extremely low, it becomes insufficient for copyright protection.
Therefore, there is a need for a method that can reliably prevent such illegal copying. Particularly, in recent years, a large-capacity disc-shaped digital recording medium has become widespread as a recording medium, and an illegal copy prevention measure for a digital video signal recorded on the disc-shaped digital recording medium is desired.

In the digital dubbing,
For the purpose of preventing illegal copying, for example, the predetermined ID
By skipping bits, illegal copying can be easily realized. Therefore, there is a demand for a preventive measure against illegal copying in which the ID bit is skipped.

The illegal copy prevention measures are desired not only for digital video signals but also for digital audio signals and other digital data.

Therefore, the present invention has been made in view of such a situation, and prohibits the conversion of digital data into an analog signal once and the illegal copying in an analog or digital manner. It is an object of the present invention to provide a video signal reproduction method and device capable of prohibiting generation copying, a signal transmission method and device, and a combination device and method of video signal reproduction and recording.

[0011]

A signal reproducing method and apparatus according to the present invention include an encrypted video signal digitally scrambled with key information, a recording control code for controlling a mode of a reproducing state, and key information. When the recorded digital disk medium is reproduced and an analog video signal for which illegal copying is prevented is output, the key information and the state of the recording control code are detected, and the digitally scrambled code is detected. For the encrypted video signal, the encrypted video signal is de-scrambled with the detected key information, and for the analog video signal converted from the de-scrambled digital data, the recording control code is used. In order to output an analog video signal with illegal copy prevention based on the detection output of The initial value for the Le solving the problems described above by set based on the detected key information.

Further, the signal transmission method and apparatus according to the present invention takes out transmission control information for managing transmission accompanying the transmitted digital data when the transmitted digital data is received and reproduced. , At least the digital data D based on the transmission control information.
The above-mentioned problem is solved by performing a predetermined conversion process for preventing illegal copying on the analog signal obtained by the / A conversion and a predetermined conversion process for digitally scrambling the digital data.

Further, the signal transmitting method and apparatus for recording according to the present invention is a transmission for managing transmission accompanying the transmitted digital data when the transmitted digital data is received and recorded. Retrieve control information,
Based on the transmission control information, at least the analog signal obtained by D / A converting the digital data is subjected to a predetermined conversion process for preventing illegal copying, and a predetermined conversion process for digitally scrambling the digital data is performed. By applying, the above-mentioned subject is solved.

Further, the signal recording method and apparatus according to the present invention is a transmission control for managing the transmission accompanying the transmitted analog data when the transmitted analog data is received and recorded in a recording medium. Information is detected, and based on the transmission control information, at least a digital signal obtained by A / D converting the analog data is subjected to a predetermined conversion process for preventing illegal copying, and a predetermined digital scramble is performed on the digital data. The above-mentioned problem is solved by performing the conversion process of (1) and recording on the recording medium.

Further, the apparatus and method for combining the digital disc layer value and the analog VTR according to the present invention, the encrypted video signal digitally scrambled with the key information, the recording control code and the key for controlling the mode of the reproduction state. A digital disk medium on which information and information are recorded is reproduced, an analog video signal for which illegal copying is prevented is output, and this analog video signal is input to record the analog video signal on a video tape in an analog VTR. A device and method for combining video signal reproduction and recording, wherein in the video signal reproduction by the digital disk device, the state of the recording control code and the key information are detected, and the digital scrambled encrypted image is detected. For the signal, the encrypted video signal is decrypted with the detected key information. An analog video signal is output that is scrambled and the de-scrambled digital data is converted to an analog video signal and output. Based on the detection output of the recording control code, the analog video signal output is processed to prevent illegal copying. As described above, in the recording by the analog VTR, a mode in which the recording means of the analog VTR should react on the basis of the detection output of the recording control code in order to prevent illegal copying of the analog video signal output. The above problem is solved by including the recording scramble signal of.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will now be described in detail with reference to the drawings.

As an example of the digital recording medium used in the embodiment of the present invention, an optical disc will be described as an example, and the flow until the optical disc is manufactured will be described with reference to FIG.

First, in a mastering step 30 for producing a master disk MD, for example, digital video data obtained by converting a movie film into a digital signal, digital data directly sent from a digital camera, and further for a broadcasting station are connected to a terminal 1. The digital video data from the digital VTR of FIG. Digital video data, for example, supplied via the terminal 1 is sent to the compression encoding circuit 2, where the so-called MPEG (Movi
ng Picture Image Coding Experts Group: A so-called MPE standardized by the study organization for video coding for storage)
The G2 standard compression encoding is performed and the data is sectorized in a unit of a predetermined data amount, for example, a unit of 2048 bytes.

The data that has been compression-encoded and sectorized by the compression-encoding circuit 2 is sent to the scramble circuit 9 as needed. 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. Here, the output of the compression encoding circuit 2 is output using the copy management information. The data is scrambled as described later.

The data scrambled by the scramble circuit 9 is sent to the 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 generating circuit 3, and the copy management information is added to the output data of the scramble circuit 9.

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

This copy management information corresponds to the innermost or outermost circumference of the optical disc and is a so-called T of the lead-in area which is provided at the start end of the spiral optical track.
It is added to either or both of the OC (Table Of Contents) and the header of the data sector in the program area. It should be noted that in the following description, an example is described in which the data is added to both the TOC and the data sector header. Therefore, the copy management information adding circuit is
The TOC has an additional circuit 4 for adding the copy management information and an additional circuit 5 for adding the copy management information in the header of the data sector.

The copy management information is composed of either one or both of information for instructing prohibition of analog and digital copying or only for digital copying, and information for instructing copy generation restriction. The following example will be described as including both of these pieces of information. The copy management information can also include billing information. By including this billing information in the copy management information,
For example, based on the billing information, for example, only video playback is free, copying is charged and copying is possible only when a fee is paid (copying is prohibited if the fee is not paid). It is also possible to do it.

As the copy management information at this time,
As shown in FIG. 2, it is possible to cite, for example, a bit consisting of 8 bits b7 to b0. Of the 8 bits, for example, b7 and b6 of bits of the upper is assigned as a bit CM _C for instructing generation restriction, for example the lower side b
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 bits of the CM _M (b2, b
When (1, b0) is (1,1,1), the digital and analog copy prohibition is shown, and when (0,1,1), the digital copy prohibition is shown. The bit CM _C assigned to generation restriction in the copy management information in the preparation stage of the master disk MD is
It means that it is an original disc.

It is also conceivable to allocate only the bit b2, for example, as a bit CM _M for instructing that copying is prohibited or not prohibited.

It should be noted that, as described above, the copy management information is inserted for each sector unit, for example, for a so-called CD-ROM, that is, one disc contains several kinds of video signals of different categories. In order to be able to deal with cases where it is not centrally managed,
This is because they are arranged not in the entire surface of the disc but in a state of being divided in the disc so as to correspond to each category. Further, it is also possible to add copy management information for each predetermined block unit instead of the sector.

The data to which the copy management information is added by the copy management information adding circuit is sent to the encoder / modulation circuit 6. The encoder / modulation circuit 6 performs data delay and parity calculation as error correction coding processing on the supplied data to add parity,
According to a predetermined modulation method, for example, 8-bit data is converted into 16
The data is converted into channel bit modulation data, and a synchronization signal having a so-called out-of-rule pattern that breaks the modulation rule of the above-described predetermined modulation method is added in a predetermined data amount unit, and the processed data is sent to the optical head device 7. send.

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

Here, the scramble circuit 9 is realized by a structure as shown in FIG. 3, for example.

In FIG. 3, a so-called parallel block synchronous type scrambler using a 15-bit shift register can be used for the scramble circuit 9. Terminal 4 for data input of this scrambler
In FIG. 5, the LSB (least significant bit) is in a temporally earlier order, that is, the so-called LSB first, and for example, the data section of FIG. 5 described later and the TOC of FIG.
Data in which 4 bytes of the error detection code (EDC) are added to 2048 bytes of the data portion is input. 15-bit shift register 41 for scrambling
Is subjected to feedback according to the generator polynomial g (x) = x ¹⁵ + x + 1 by using the exclusive OR (ExOR) circuit 42, and the 15-bit shift register 41 performs copy management as shown in FIG. A preset value (or an initial value) according to the bits b2, b1, b0 (1, 1, 1 or 0, 1, 1) of the bit CM _M of the information
Is variably set, 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, the bit CM _M and the bit CM
It can also be variably set by both _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 to add the copy management information shown in FIG. Sent to the circuit.

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

The disc D duplicated from the master disc MD in the replication step 40 has a center hole 102 in the center as shown in FIG. 4, and the program is performed from the inner periphery to the outer periphery of the optical disc D. Lead-in area 103 serving as the TOC area which is a 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 are formed. In this example,
The video data that has been subjected to the above-described compression coding and the like is recorded in the program area 104, and time information of the video data is managed in the lead-in area 103. The above-mentioned copy management information is recorded in the TOC sector of the lead-in area 103 and / or in the header of the data sector in the program area 104.

Here, the data in the program area 104 is
As shown in FIG. 5, the structure of the data sector is 4 bytes (hereinafter
The lower 1 byte is 8 bits) Data sync part D
_SAnd a 16-byte header part D_HAnd 2048 bytes
Data part D_DAnd 4-byte EDC (error detection
Code) part D_EAnd the copy management information
Report (1 byte) D_PIs the header part D_HWill be placed inside. Well
The structure of the TOC sector of the lead-in area 103 is
As shown in Fig. 6, 4 bytes (1 byte is 8 bits)
Data sync section T_SAnd a 16-byte header part T_HWhen,
2048-byte TOC data section T_DAnd a 4-byte E
DC (Error Detection Code) section T _EAnd from
, The copy management information (1 byte) T_PIs TOC de
Data section T_DWill be placed inside.

Of course, the copy management information T _P can have copy management information for each file in combination with an address of a file (file position, size and copy management information pair), and the number of bytes (bits). It is also possible to increase the number) to have more detailed copy management information than the copy management information D _P.

The above-mentioned optical disc D is an original disc, which is then sold or rented and distributed to the user. The original optical disc D is reproduced by the user at home, for example.

That is, returning to FIG. 1, in the reproducing apparatus 50 for home use etc. of the optical disk D, the optical head device 10 outputs a signal from the optical disk D rotated by the spindle motor 11 whose rotation servo control is performed 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 R
The F signal is binarized, the signal recorded on the optical disc D is taken out, the binarized signal is sent to the demodulation circuit 14, the sync signal is separated from the RF signal, and a tracking error signal and a focus error are further generated. A signal or the like is 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 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 4 is sent to the error correction circuit 15, and the reverse processing of the previously performed error correction coding is performed. The digital video data output from the error correction circuit 15 is decomposed into sectors by the sector decomposition circuit 16, passes through a copy management information reading circuit, which will be described later, and a de-scramble circuit 31 that follows, and then is expanded into a decompression decoding circuit 21. Sent.

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

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

On the other hand, the copy management information reading circuit reads the added copy management information from the header of the data sector as described above, and the TOC.
A reading circuit 17 for reading the added copy management information from the TOC data area of the sector
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, the corresponding one of the reading circuits 17 and 18 is corresponding to that.

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 determines the state of what generation the copy generation restriction indicates, and outputs a determination signal according to the determination result. This determination signal is sent to the protect signal generation circuit 20 described later. Further, the copy management information discrimination circuit 19
Is a descrambling circuit 31 for the copy management information.
Send to.

The de-scramble circuit 31 has the same structure as the scramble circuit 9 of FIG. 3, and the de-scramble circuit 31 is based on the copy management information from the copy management information discriminating circuit 19. The preset value (or initial value) is variably set. As a result, in the de-scramble circuit 31, the de-scrambling circuit 31 descrambles the scramble processing in the scramble circuit 9.
Scramble processing, that is, encryption / decryption is performed. In other words, the de-scramble circuit 31 must read the copy management information supplied from the copy management information reading circuit from the header of the data sector or the TOC data area of the sector of the TOC and supplied from the copy management information discriminating circuit 19. In that case, the scramble cannot be unscrambled. The data descrambled by the descrambling circuit 31 is sent to the decompression decoding circuit 21. In addition, the above-mentioned de-scramble circuit 31
The preset value (or initial value) can be set based on the key information instructed by the copy management information.

Further, in the digital scramble circuit 32 to which the digital data from the decompression / decoding circuit 21 is supplied, the digital video data from the decompression / decoding circuit 21 based on the copy management information is supplied as in the scramble circuit 9. Digital scramble processing is performed. As a result, the digital scramble circuit 32 is
Outputs the scrambled digital video data, and the data is output from the digital interface circuit 26. Incidentally, also in the digital scramble circuit 32, it is possible to perform the digital scramble process based on the key information indicated by the copy management information.

By the way, in the case of so-called digital dubbing in which the digital data obtained by reproducing the signal recorded on the optical disk (that is, the digital recording medium) is recorded on another digital recording medium as it is, illegal copy 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. However, it is necessary to skip the copy management information, that is, the ID bit. If so, illegal copying can be easily realized.

On the other hand, according to the above-mentioned 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 disc D will be read. Since the recorded digital data is scrambled on the basis of the copy management information, the scramble cannot be descrambled, and thus illegal copy can be prevented. Further, according to the configuration example of the present invention, since the digital scramble circuit 32 also performs the digital scramble processing based on the copy management information, the digital scramble processing is performed in the case of digital dubbing. Since digital data is to be copied and the above-mentioned copy management information is required to descramble this, illegal copy protection can be realized also from this.

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 concerned
It is also possible to provide a switch 33 instead of 2.
In this case, if the switch control is performed so that the switch 33 is turned off when the content of the copy management information indicates that copying is prohibited, the digital interface circuit 26 is controlled.
From this, digital video data is not output, and it is possible to prevent illegal copying in digital dubbing at this time as well. The switch 33
In the case where the switch management information is provided, the signal sent from the copy management information discriminating circuit 19 to the switch 33 becomes a switch switching control signal according to the copy management information.

[0047] The bit CM _C of the generation restriction of the copy management information in the digital dubbing, for example, when you allow a copy of the current generation does not perform the digital scrambled in the digital scrambling circuit 32 (switch 33 If the switch 33 is provided, the switch 33 is turned on) and the digital data can be output as it is. However, in the above-described example of FIG. 2, since the bit _CMM has a value that prohibits digital copying in any case, the switch 33 is not turned on in the example of FIG.

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

In the example of FIG. 7, the mastering process 30
In the above, the data compressed and sectorized by the compression encoding circuit 2 is directly copied to the copy management information adding circuit (addition circuit 4 for adding copy management information in the TOC and copy management in the header of the data sector). It is sent to the addition circuit 5) for adding information. In the reproducing apparatus 50, the digital video data decomposed into sectors by the sector decomposition circuit 16 is a copy management information reading circuit (a reading circuit 17 for reading the copy management information from the TOC data area and from the header of the data sector, respectively). 18) and is sent to the expansion decoding circuit 21 as it is, and the digital data from the expansion decoding circuit 21 is sent to the digital interface circuit 26 through the switch 22. The determination signal from the copy management information determination circuit 19 is sent to the protect signal generation circuit 20 and also to the switch 22 as a switching control signal. Other configurations and operations are the same as those in FIG.
Since it is the same as the example described above, the same reference numerals are given to the corresponding portions and the description thereof will be omitted.

In the example of FIG. 7, the switch 22 is turned off by the switching control signal according to the determination result when the determination result indicates that copying is prohibited.
It should be noted that a bit CM for the generation restriction of the copy management information
_{Even when C} indicates that the copy is not the original disc and the copy is prohibited, the copy management information discrimination circuit 19 outputs the switching control signal for turning off the switch 22.

As a result, the digital video data is not output from the digital interface circuit 26. Therefore, the digital data reproduced from 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, the digital video data recorded on the original digital recording medium is reproduced and once D / A converted into an analog video signal, the D / A converted analog signal is output through an analog interface having an analog output and an analog input terminal. The analog video signal is converted to digital video data by A / D conversion again and digitally recorded, or the analog video signal is analog-recorded as it is. Even in the case of copying, the protect signal generating circuit 20 generates a protect signal as shown in FIGS. 8, 10, and 12, which will be described later, and the mix circuit 24 mixes it with an analog video signal. To prevent illegal copying. So that it is.

First, referring to FIGS. 8 and 9, the digital video data recorded on the digital recording medium is reproduced and once D / A converted into an analog video signal, and the analog video signal is passed through an analog interface. Now, description will be made on the prevention of illegal copying in the case where the A / D conversion is performed again to restore the digital video data and the digital video data is digitally recorded.

[0054] In the following description, the bit CM _C of the generation restriction of the copy management information permits a copy of the original one generation (i.e. it is the second generation or later from the original to reproduce the copied data Can not)
The description will be given by taking the case of one as an example.

That is, in the reproducing apparatus 50 for the optical disc 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 discriminating signal corresponding to these discriminating results is the protect signal generating circuit 20.
Sent to.

Here, the bit CM of the above copy management information
_M does not show inhibition of the analog copy, and when the bit CM _C of the generation restriction indicates that the original disc, from protect code signal generating circuit 74 in the protect signal generating circuit 20, the Protect code signal PC indicating the effect by encoding with multiple bits
S is generated and output.

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

Analog output terminal 29 of the reproducing device 50
And an optical disc recording / reproducing device 8 using an optical disc RD recordable on a recording medium as an example of a video recording / reproducing device.
0 is connected to the analog input terminal 81,
The analog video signal output from the analog output terminal 29 of 0 to which the program code signal is added is A / D converted by the disk recording / reproducing device 80 into digital video data, and this digital video data is digitally recorded on the optical disk RD. It 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 apparatus 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 the compression encoding circuit 83, where it is compression encoded according to the MPEG2 standard, and a predetermined data amount unit, for example, 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
It is sent to the scramble circuit 85.

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

Here, it is shown that the protect code signal supplied to the protect code signal detection circuit 88 at this time is from the original disc.
As mentioned above, copying of the first generation from the original is permitted.

[0062] Thus the protect code signal detection circuit 88, the bit CM _C of the copy management information generation restriction
Is changed to a value indicating that it is the first generation from the original disc and is output.

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

In the scramble circuit 85, the output data from the compression encoding circuit 83 is scrambled on the basis of the copy management information from the protect code signal detection circuit 88 as in the scramble circuit 9 of FIG. Give. The scrambled data from the scramble circuit 85 is sent to the copy management information adding circuit. Instead of the scramble circuit 85,
You may make it use an encryption circuit.

The copy management information adding circuit is similar to that described above.
The TOC has an addition circuit 86 for adding the copy management information and an addition 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 performs data delay and parity calculation as error correction coding processing on the supplied data and adds parity, and, for example, 8-bit data is converted into 16 bits according to a predetermined modulation method. The data is converted into channel bit modulation data, and a sync signal having a so-called out-of-rule pattern that breaks the modulation rule of the above-mentioned predetermined modulation method is added in a predetermined data amount unit, and the data after the processing is applied to the optical head device 90. send.

The optical head device 90 is a laser that is driven based on the data supplied from the encoder / modulation circuit 89 with respect to a recordable optical disk RD that is rotated by a spindle motor 91 that is under rotation servo control. Optical recording is performed by irradiating with light. The recording on the optical disc RD may be so-called magneto-optical recording. When performing the magneto-optical recording, the optical disc RD is placed at a position facing the optical head device 90. Optical disk R with magnetic head
A laser beam having sufficient power to raise the magnetic film formed on D to the Curie temperature or higher is irradiated from the optical head device 90, and the magnetic head is moved to the encoder / modulation circuit 8 described above.
It drives based on the signal from 9. As a result, the digital video data from the original disc has been copied to the optical disc RD by regenerating the digital video data via the analog interface.

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

That is, in the reproducing apparatus 50, the above 1
The data read from the optical disc RD on which the copy of the generation is copied is sent to the copy management information reading circuits 17 and 18 in the same manner as described above.
The copy management information extracted by 18 is sent to the copy management information discrimination circuit 19.

The judgment signal from the copy management information judging circuit 19 is sent to the protect signal generating circuit 20, and the protect signal generating circuit 20 outputs the protect code signal P.
CS is output and sent to the mix circuit 24. As in the above, the mix circuit 24 is descrambled by the descrambling circuit 31, processed by the decompression decoding circuit 21, and further processed by the D / A conversion circuit 23.
An analog video signal that has been D / A converted is supplied. The protect code signal PCS is mixed with the analog video signal in the mix circuit 24,
An analog video signal mixed with the protection code signal PCS is output via the analog output terminal 29.

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

In the optical disk recording / reproducing apparatus 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, and the compression encoding circuit 8 is used, as described above.
In 3 the compression coding and the sectorization are performed, and this data is sent to the scramble circuit 85.

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

Here, it is shown that the protect code signal supplied to the protect code signal detection circuit 88 at this time is from the optical disc on which the first generation copy is made. The above protection code signal detection circuit 88 of the time, a bit CM _C of the generation restriction of the copy management information, and outputs the change to the value indicating the second generation from the original disk.

The copy management information from the protect code signal detection circuit 88 is sent to the scramble circuit 85 and the copy management information addition circuit. Similarly to the 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, and the scramble circuit 85 from the scramble circuit 85 in the copy management information addition circuit. The above-mentioned copy management information is added to the scrambled data of and output.

When an encryption circuit is used instead of the scramble circuit 85, the protect code signal detection circuit 88 outputs it as a control signal for controlling the encryption circuit to perform encryption. . At this time, this control signal can also be used as encryption key information. 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 subjected to error correction coding processing and modulation data processing in the encoder / modulation circuit 89, and then sent to the optical head device 90 or the magnetic head. Optical or magneto-optical recording is performed on the optical disk RD as described above.

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

The digital reproducing circuit 92 of the reproducing system, together with the main components such as the RF circuit 12, the demodulating circuit 14, the error correcting circuit 15, the sector disassembling circuit 16 and the decompression decoding circuit 21 similar to the reproducing device 50, are described above. It has a copy management information reading circuit, a copy management information discriminating circuit 19, a de-scramble circuit 31 and the like.

[0080] The in copy management information determining circuit for digital reproduction circuit 92, by performing the determination of the bit CM _C of the generation restriction of the copy management information read from the optical disk RD, the optical disc RD are second generation copies of the Know that it was done. At this time, the copy management information discrimination circuit 19 of the digital reproduction circuit 92 does not output, for example, the copy management information to the de-scramble circuit 31 (or outputs the copy management information that cannot be descrambled). .

As a result, the digital reproducing circuit 92 concerned
The data sent to the decompression / decoding circuit 21 therein is data that has not been descrambled. Therefore, even if the decompression / decoding circuit 21 decompresses the data, normal digital video data is obtained. 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 the television receiver 71 via the analog output terminal 94, a normal image is obtained. Will not be obtained.

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

Also in the case of digital copying through this analog interface, as described above,
Even if the copy management information is skipped for the purpose of illegal copying when the reproduction device 50 reproduces the optical disk RD, the scramble processing based on the copy management information is performed on the digital data recorded on the optical disk RD. Since it is provided, the de-scramble circuit 31 cannot descramble, and the protect code signal generation circuit 74 cannot generate the protect code signal based on the copy management information. Can be prevented. That is, since the optical disc recording / reproducing apparatus 80 side cannot generate the copy management information based on the protect code signal, the scramble circuit 85 cannot descramble, and thus the illegal copy can be prevented. Further, for the purpose of illegal copying, it is conceivable to mask the protect code signal, for example, instead of skipping the copy management information. In this case as well, the optical disc recording / reproducing device 80 is used.
Since the scrambling circuit 85 cannot unscramble the scramble, illegal copying can be prevented.

[0084] In the above example, although an example that allows for copying of the first generation from the original disk, the bit CM _C of the generation restriction of the copy management information 1
By setting a value that also prohibits copying of the first generation, it is possible to prevent copying of the first generation from the original disc.

Further, in the above example, the recording / reproducing device 80
Although an example of using the recordable optical disk RD has been described above, it goes without saying that the same copy protection can be performed even in a device capable of recording and reproducing digital video data on the video tape TP.

Next, in the above-mentioned 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 this analog video signal is again A / A converted into a digital video signal. D
Although the case of converting and digitally recording has been described, illegal copying can be prevented even when analog video signals are directly analog-recorded.

Hereinafter, with reference to FIGS. 10 and 11, for example, the digital video data recorded on the original digital recording medium is reproduced to once convert it into an analog video signal.
A description will be given of prevention of illegal copying in the case where A / A conversion is performed and this analog video signal is analog-recorded by a conventional analog video tape recorder (analog VTR).

That is, in this case, in the reproducing apparatus 50 for the optical disc D shown in FIG. 11, the bit CM of the copy management information is used.
_{When M} indicates prohibition of analog copy, and when the discrimination signal from the discrimination circuit 19 corresponds to prohibition of the analog copy, the protect pulse generating circuit 72 in the protect signal generating circuit 20 outputs a white peak signal. A certain analog protect pulse APP is generated, and the analog protect pulse APP is mixed in the predetermined period of the vertical blanking period of the analog video signal by the mix circuit 24 as shown in FIG. In addition to these, the protect pulse generation circuit 72 generates the analog protect pulse APP even when the copy management information is not supplied. Incidentally, when it is instructed that the bits CM _C of generation restriction represented by the copy management information is prohibited now analog copy of the current generations, the prohibition of the analog copy from the copy management information determining circuit 19 A corresponding discrimination signal is output. A system (Analog Pro) that prohibits such analog copying is
tection System).

The output signal from the mix circuit 24 is
Within the vertical blanking period of the analog video signal, a plurality of pairs of a pseudo sync pulse and a positive pulse in a predetermined order are added to the video signal following the sync pulse. For example, in the specific example of FIG. 10, a pulse pair of a pseudo sync pulse P ₁₂ and a positive pulse (for example, a white peak pulse) P ₁₄ is provided between two equalizing pulses P ₁₀ in one line (one horizontal period). Multiple pairs are inserted. The use of such a combination signal of a plurality of pseudo sync pulses and a plurality of white peak signals as a recording scramble signal is disclosed in JP-A-61-288582. This pseudo-sync pulse (PSP)
APS using e) is also called a PSP system.

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

Analog output terminal 29 of the reproducing device 50
And the analog input terminal 61 of the analog VTR 60 are connected to each other, and the analog video signal output from the analog output terminal 29 of the playback device 50, to which the recording scramble signal is added, is transferred to the video tape TP of the analog VTR 60.
Suppose you want to record.

Generally, the analog VTR 60 is an AGC which is an automatic amplitude adjusting means or an automatic gain controlling means.
It has an (Automatic Gain Control) circuit 62, and this AGC circuit 62 automatically adjusts the amplitude of the analog video signal input through the analog input terminal 61. For the analog VTR 60 including such an AGC circuit 62, as shown in 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, and the amplitude of the original video signal is narrowed. That is, the AGC circuit 62 of a general video tape recorder uses the equalization pulse P
₁₀ and the pseudo sync pulse P ₁₂ cannot be discriminated from each other, and therefore the AGC circuit 62 samples the level of the added positive pulse P ₁₄ and erroneously recognizes that the input signal level is several times higher than usual, and the gain is increased. The control is performed to reduce Therefore, the analog video signal whose amplitude is automatically adjusted by the AGC circuit 62 is recorded on the video tape TP through the analog recording circuit 65, and then this video tape TP is reproduced by the analog reproducing circuit 67 to be analog. When the image is displayed on the television receiver 70 via the output terminal 68, a very unsightly image such as an abnormal lightness or darkness of a reproduced image is obtained.

In this case, 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 analog-recorded by the conventional analog VTR. It is possible to prevent illegal copying, including generational restrictions.

Also in the case of analog copy through this analog interface, even if the copy management information is skipped for the purpose of illegal copying when reproducing the optical disk RD in the reproducing apparatus 50 as described above, Since the digital data recorded on the optical disk RD has been scrambled based on the copy management information, the de-scramble circuit 31
In this case, the scramble cannot be undecreased, and since the protect code signal generating circuit 74 generates the protect pulse even when the copy management information is not supplied, 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 the analog protect pulse APP from the analog video signal supplied via the analog input terminal 61 is provided for R60, and
A switch 64 may be provided, for example, at a subsequent stage of the GC circuit 62, and the switch 64 may be turned off when the analog protect pulse detection circuit 63 detects the analog protect pulse APP. It is possible to prohibit. That is, when 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, and thus illegal copying can be prevented.

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

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 and transmitted through the analog interface, and then converted back to digital video data. It is possible to prohibit illegal copying both in the case of digital recording by digital recording and in the case of transmitting the analog video signal through an analog interface and performing analog recording as it is.

That is, in the reproducing apparatus 50 for the optical disc D shown in FIG. 13, the copy management information discriminating circuit 19 is
A discriminating circuit 71 for discriminating the state of the bit CM _M of the copy management information, and a bit CM of the copy management information.
_And a discrimination circuit 73 for discriminating the state of _C. Discrimination signals from these discrimination circuits 71 and 73 are sent to the protect signal generation circuit 20, and 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 generation circuit 20 generates the analog protect pulse APP based on the discrimination signal from the discrimination circuit 71, and the protection pulse generation circuit 72 based on the discrimination signal from the discrimination circuit 73. The protection code signal generation circuit 74 generates 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
It is sent to the mix circuit 24.

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

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

Analog output terminal 29 of the reproducing apparatus 50
Is an analog input terminal 81 and an analog V of an optical disk recording / reproducing device 80 using a recordable optical disk RD.
Since the analog VTR 60 is connected to the analog input terminal 61 of the TR 60, the analog video signal is analog-recorded on the video tape TP, and the optical disc recording / reproducing device 80 converts the analog video signal into digital video data. After that, it will be recorded on the optical disk RD. The recording / reproducing operations in the analog VTR 60 and the optical disc recording / reproducing device 80 are the same as those described above, and therefore their explanations are omitted here. However,
In the optical disc recording / reproducing apparatus 80, the protect code signal detecting circuit 88 causes the protect code signal PC
In addition to the detection of S, the analog protection pulse APP is also detected, and when the analog protection pulse APP is detected, the scrambling process is performed by the scramble circuit 85 to prevent illegal copying.

Next, still another embodiment of the present invention will be described. Various concrete examples are conceivable other than the concrete example of the copy management information shown in FIG. 2, the concrete example of the scramble circuit shown in FIG. 3, the concrete example 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 copy generation management. 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 It allocated as bits CM _A shown. The remaining b2 to b0 are undefined. Here, the CM _C bits (b7, b6) is copy free when, for example (0,0), respectively one generation copy permission, copy prohibition when (1, 1) when (1,0) , (0, 1) are unused. Bits of the APS trigger bits CM _T (b5, b4) are, for example, indicates the off time (0,0), above PSP (pseudo sync pulses: Pseudo-Sync Pulse) when (0,1) to turn on the Indicates that the split burst (or color stripe) to be described later is turned off. When it is (1, 0), P
It is shown that the SP is turned on, the split burst of 2 lines is turned on, the PSP is turned on at the time of (1, 1), and the split burst of 4 lines is turned on. When the bit b3 of the CM _A is 1, it indicates an analog package medium, and when it is 0, it indicates the other.

[0106] The APS The contents above PSP on the trigger bit CM _T, a predetermined period in the analog protection pulses APP vertical blanking period as shown in FIG. 10 and FIG. 12, for example 12H~19H between Means to insert into. What is the split burst on?
It means partial inversion of the color burst provided at the position after the horizontal sync pulse in the horizontal blanking period, and 2-line split burst-on means that the color burst is inverted every two lines every 17 lines. Also, with 4 line split burst on, 21
This means that color burst inversion is performed continuously for four lines for each line. Note that the color burst inversion is an operation of inverting a part of the first half of the color burst signal or changing the phase thereof, and such an inversion split color burst causes a color video signal to be copied. On the other hand, it causes color interference such as generation of color stripes.

FIG. 15 is a diagram for explaining the inversion split color burst APS, and is arranged at a position after the horizontal synchronizing pulse HD in the line to which the above color burst inversion is applied. Color burst C that serves as a reference signal for a color subcarrier (color subcarrier)
A part of B, for example, the phase of the shaded portion in the figure is inverted. That is, the color burst section C _N in the standard NTSC system is, for example, 9 cycles, and a burst signal for 2 cycles is connected as a pre-section C _P to a position in front of the color burst standard section C _N ,
It is a color burst of all 11 cycles. Two cycles of this pre-section C _P and color burst standard section C
The burst phase of 5.5 cycles with the 3.5 cycles of the front section C _F in the first half of _N is inverted, and the 5.5 cycles of the back section C _B of the second half in the remaining color burst standard section C _N Is left as is.

Such a partially phase-inverted color burst signal is generated by, for example, the protect pulse generating circuit 72 of FIGS. 11 and 13 and sent to the mix circuit 24. When the 2-line split burst is on, 1
It is only necessary to mix the phase inversion color bursts continuously for every 7 lines and to mix the phase inversion color bursts for every 4 lines continuously for every 21 lines when the 4-line split burst is on.

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

Next, FIG. 16 shows another concrete example of the scramble circuit which is an alternative to the concrete example of the scramble circuit shown in FIG. In the specific example of FIG. 16, a 15-bit shift register 41 for scrambling uses an exclusive OR (ExOR) circuit 42 to generate a polynomial x ¹⁵
3 is different from the specific example in FIG. 3 in that feedback according to + x ⁴ +1 is applied, and other configurations are the same, so the same reference numerals are given to corresponding parts and description thereof will be omitted.

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

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

As shown in FIG. 18, the 4 bytes of the ID (identification data) is the first byte (bit b) on the MSB side.
31 to b24) are composed of sector information, and the remaining 3 bytes (bits b23 to b0) are composed of sector numbers.
The sector information consists of 1-bit sector format type, 1-bit tracking method, 1-bit reflectance, 1-bit spare, 2-bit area type, 2-bit layer number information in order from the MSB side. There is.

The above-mentioned 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,
In the sector format in the TOC area, one byte in the above-mentioned 6-byte RSV may be used as a copy management information area by combining several bytes or tens of bytes of the main data portion.

In the above configuration example, recording / reproduction on an optical disk or a video tape is described as an example, but 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) on the digital data to be transmitted as key information, and the transmission control information is added to the encrypted digital data. By sending it, illegal copying can be prevented.
As a signal transmission device corresponding to the signal transmission method of the present invention, for example, in the configuration of FIG. 1, FIG. 9, FIG. 11 and FIG. 13, for example, an encoder / modulation circuit performs encoding or modulation processing according to the transmission method. It can be applied as it is, by changing it to a means, and further changing the optical head device for recording / reproducing or the interface means to the outside to a data transmitting means or a receiving means.

Further, in the above-mentioned example, only the scrambling / de-scrambling is described in the encryption processing, but 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 it may be performed in the compression encoding circuit 2 or the encoder / modulation circuit 6. In this case, the conversion processing on the reproducing side is also similar to the demodulation circuit 14 and the error correction circuit 1 instead of the de-scramble circuit 31.
5, the sector decomposition circuit 16 or the decompression decoding circuit 21. When any of the demodulation circuit 14, the error correction circuit 15, the sector decomposition circuit 16, and the decompression decoding circuit 21 is used, the information for the discrimination by the copy management information discrimination circuit 19 is obtained before that. Need to be In this case, for example, since the TOC information is first obtained, 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 countermeasures against illegal copying for both analog copy and digital copy.

Here, in the above-described embodiment of the present invention, the processing for preventing illegal copying is performing a predetermined conversion processing on an analog signal or scrambling a digital signal. It includes processing. For example, as the processing for preventing the illegal copy with respect to the analog video signal, there is a processing of adding a recording scramble signal and / or a recording prohibition signal to a predetermined area of the vertical blanking period of the analog video signal.
The process of digitally scrambling the digital data reproduced from the recording medium is also an example of the 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 generated over a plurality of horizontal periods in the vertical blanking period of the analog video signal. Processing for arranging a combination signal with multiple white peak signals, processing for changing the phase of at least part of the color burst signal of the analog color video signal, and predetermined horizontal period within the vertical blanking period of the analog video signal. There is a process of arranging a signal for preventing illegal copying encoded by a plurality of bits.

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

Further, according to the signal recording method and apparatus in the embodiment of the present invention, the signal is encrypted or the recording control is performed by using at least a part of the recording control information for managing the recording of the signal recording medium as the key information. A signal is encrypted with key information indicated by at least a part of the information, and the recording control information is reproduced in the reproduction mode control signal area portion and / or a predetermined position of each recording unit of the signal to the signal recording medium. The illegal copy can be prevented by arranging the same in the recording medium and recording it on the signal recording medium together with the encrypted signal.

Further, according to the signal transmission method and apparatus in the embodiment of the present invention, the digital data and / or the digital data is based on the transmission control information for managing the transmission accompanying the transmitted digital data. Illegal copying can be prevented by subjecting the analog signal obtained by D / A conversion to a predetermined conversion process.

Furthermore, the signal transmission method and apparatus according to the embodiments of the present invention use at least a part of the transmission management information for managing the signal transmission as key information to encrypt the signal or at least one of the recording control information. Illegal copying can be prevented by encrypting the signal with the key information instructed by the section and transmitting the transmission control information along with the encrypted signal.

Furthermore, 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 provided in the reproduction mode control signal area portion and / or the signal. By arranging and recording at a predetermined position of each recording unit and recording the signal by encrypting the signal by 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, both the digital data and the analog signal are subjected to a predetermined conversion process based on the recording control information or the transmission control information. As the predetermined conversion process, for example, the digital data is encrypted and the analog signal is converted. In order to prevent illegal copying for both digital copying and analog copying, scrambling is performed. 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 broken by skipping the recording control information or the transmission control information and reproducing the signal. Therefore, it is possible to prevent illegal copying.

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

Further, according to the video reproducing and recording combination apparatus and method in the embodiment of the present invention, at least the analog video is reproduced by reproducing the digital disk medium in which the digital video signal and the recording control code are recorded. A combination device and method for reproducing and recording a video signal for outputting and recording a signal, wherein a recording scramble signal in the form of an analog signal is generated based on a status detection output of a recording control code, and a digital video signal is converted. The above-mentioned recording scramble signal is added to a predetermined area of the vertical blanking period of the obtained analog video signal and output, and the amplitude is adjusted by an automatic amplitude adjusting means that responds to the recording scramble signal included in the input analog video signal. By recording the input analog video signal on an analog recording medium, It is possible to prevent copying.

Furthermore, according to the combination device and method of the video signal reproduction and recording in the embodiment of the present invention, the recording prohibition signal in the form of the analog video signal is generated based on the state detection output of the recording control code, and the digital signal is generated. Included in the input analog signal when a recording inhibit signal is added to the specified area of the vertical blanking period of the analog video signal obtained by converting the video signal and output, and when the input analog signal is recorded in analog or digital The illegal copy can be prevented by operating the recording prohibition means in response to the recording prohibition signal.

Furthermore, the digital disk medium according to the embodiment of the present invention is for making it correspond to the video signal reproducing method of the above-mentioned embodiment of the present invention, and it is used for recording scramble together with the digitized video signal. By recording a 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,
When outputting an analog video signal obtained by D / A converting a digital video signal read from a digital disc medium, a recording scramble signal and / or a recording prohibition signal in the form of the analog video signal is added to the analog video signal. The analog video signal added with the recording scramble signal and / or the recording prohibition signal is recorded on the recording medium in an analog or digital manner. As a result, the video signal reproduced from the analog or digital disk medium after recording becomes scrambled, or the recording itself is not performed.

Further, in the embodiment of the present invention, a predetermined position of the signal recording medium on which digital data is recorded,
For example, with respect to the analog color video signal in the analog signal obtained by D / A converting the digital data based on the recording control information arranged in the reproduction mode control signal area section and / or each sectorized header section. By converting at least part of the phase of the color burst signal, digital data is once converted into an analog signal, and illegal copying in an analog or digital manner is prohibited. It is also possible to prohibit the illegal copy, and further, it is possible to take illegal copy prevention measures for both analog copy and digital copy at the same time.

In the embodiment of the present invention, the digital color video signal, the reproduction mode control signal area portion provided at the start end of the recording track, and / or each header portion of the sectorized digital color video signal. The recording control code allocated to the digital color image is reproduced based on the detection output of the state of the recording control code when reproducing the recorded digital disc medium and outputting at least an analog color image signal. Signal to D / A
When copying the digital disk medium, the converted analog color video signal is processed to change the phase of at least a part of the color burst signal, and the analog color video signal is output. By changing the color burst phase, an analog color video signal that has been recorded and scrambled in the form of an analog signal is recorded in an analog or digital manner, so that it is reproduced from the recorded analog or digital disk medium. The video signal thus obtained is scrambled. Therefore, according to the present invention, it is possible to prevent a digital color video signal recorded on a digital disk medium from being once converted into an analog color video signal and illegally copied in an analog or digital manner. It is also possible to prohibit copying.

In the above description, the optical disc and the video tape are explained as the signal recording medium, but in addition, a semiconductor storage medium such as a so-called IC card or various memory elements, or a magnetic disc medium such as a hard disk or a flexible disk. It is also possible to use a disc, in which optical discs are recorded by pits, magneto-optical discs, phase change optical discs, organic dye optical discs, optical discs recorded by ultraviolet laser light, and multilayer recording. Various discs such as an optical disc having a film can be used, and the tape-shaped recording medium is not limited to the video tape and can be applied to various other discs.

[0133]

According to the present invention, a digital disk medium in which an encrypted video signal digitally scrambled with key information, a recording control code for controlling the mode of a reproduction state and key information are recorded is reproduced. Then, when outputting the analog video signal in which illegal copying is prevented, the key information and the state of the recording control code are detected, and the digital scrambled encrypted video signal is processed as described above. The encrypted video signal is de-scrambled with the detected key information, and the analog video signal converted from the de-scrambled digital data is illegally copied based on the detection output of the recording control code. The initial value for de-scramble is detected in order to output an analog video signal for which By set based on the information, thereby good illegal copy protection.

Further, according to the present invention, it is possible to prevent digital data from being converted into an analog signal once and then illegally copying it in an analog or digital manner, and also to prohibit stepwise generational copying. Furthermore, it is possible to take illegal copy prevention measures for both analog copy and digital copy at the same time.

Further, according to the present invention, it is possible to prevent the digital color video signal recorded on the digital disk medium from being once converted into an analog color video signal and illegally copied in an analog or digital manner. It is also possible to prohibit even generational copying.

Furthermore, according to the present invention, the digital signal obtained by A / D converting by receiving the transmitted analog data is subjected to conversion processing and digital scrambling processing for preventing illegal copying. It is possible to prohibit illegal copying after recording this on a recording medium or to prevent generational copying in stages.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a master disc manufacturing process and a reproduction process of a duplicated disc.

FIG. 2 is a diagram for explaining 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 for explaining 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 the master disc manufacturing process and the reproduction process of the duplicated disc.

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

FIG. 9 is a block circuit diagram showing a configuration for realizing illegal copy protection when converting digital video data into an analog video signal and further converting this into digital video data for copying.

FIG. 10 is a waveform diagram showing a state in which 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 the analog video signal is copied 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 realizing illegal copy protection when copying this analog and digital.

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

FIG. 15 is a diagram for explaining color burst inversion processing.

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.

[Explanation of symbols]

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

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 9/79 H04N 9/79 ZF term (reference) 5C053 FA13 FA22 FA23 GA11 GB37 GB40 HA40 JA30 KA01 5C055 AA01 AA04 BA01 BA02 CA15 EA08 GA39 HA09 5D044 AB05 AB07 BC02 CC04 DE50 DE54 GK08 GK12 GK17 HL08 JJ07

Claims (36)

[Claims] 1. A digital disk medium on which an encrypted video signal digitally scrambled with key information, a recording control code for controlling a mode of a reproduction state, and key information are recorded is reproduced to obtain an illegal copy. A method of reproducing an encrypted video signal for outputting an analog video signal for which prevention is achieved, wherein the key information and the state of the recording control code are detected, and for the digital scrambled encrypted video signal, The encrypted video signal is de-scrambled with the detected key information, and the analog video signal converted from the de-scrambled digital data is illegal based on the detection output of the recording control code. In order to output an analog video signal with copy protection, the initial values for de-scramble are Video signal reproducing method for the Prevention of unauthorized copying, characterized in that set on the basis of the issued key information. 2. A step of attaching a recording scramble signal in a manner to react with an automatic gain control means of an analog recording device capable of recording the analog video signal in order to prevent unauthorized copying from the analog video signal output. Claim 1 for the purpose of preventing illegal copying, characterized in that
Video signal reproduction method described 3. A phase inversion color burst signal in a manner to react with a color signal processing means of an analog recording device capable of recording the analog video signal for the purpose of preventing illegal copying in the analog video signal output. 2. The method of reproducing a video signal according to claim 1, wherein the method includes a step of 4. A step of attaching an information signal in a manner to react to a copy generation restriction control means of an analog recording device capable of recording the analog video signal, in order to prevent illegal copying from being applied to the analog video signal output. The video signal reproducing method according to claim 1, which is intended to prevent illegal copying. 5. An illegal copy prevention is performed by reproducing a digital disk medium in which an encrypted video signal digitally scrambled with key information, a recording control code for controlling a mode of a reproduction state and key information are recorded. An encrypted video signal reproducing device for outputting an analog video signal as described above, wherein the means for detecting the state of the recording control code and the key information, and the digital scrambled encrypted video signal A means for de-scrambling the encrypted video signal with the detected key information, an analog video signal output means for converting the de-scrambled digital data into an analog video signal and outputting the analog video signal, and detecting the recording control code. A means for carrying out processing for preventing illegal copy on the analog video signal output based on the output, Means for I scrambling is a shift register, a video signal reproducing apparatus for the initial value of the shift register is reduced to prevent unauthorized copying, characterized in that it is configured to be set on the basis of the key information. 6. The analog video signal output means for preventing illegal copying adds a recording scramble signal in a manner to react with an automatic gain control means of an analog recording device capable of recording the analog video signal. 6. A video signal reproducing apparatus according to claim 5, which is means for preventing illegal copying. 7. The means for preventing illegal copying of the analog video signal output is a phase-inverted color burst signal in a form that should react with a color signal processing means of an analog recording device capable of recording the analog video signal. 6. The video signal reproducing apparatus according to claim 5, which is means for attaching the video signal to prevent illegal copying. 8. The means for preventing illegal copy from the analog video signal output means for attaching an information signal in a manner to react with copy generation restriction control means of an analog recording device capable of recording the analog video signal. 6. The video signal reproducing apparatus according to claim 5, which is for preventing illegal copying. 9. A signal transmission method for receiving and reproducing transmitted digital data, wherein transmission control information for managing transmission accompanying the transmitted digital data is taken out, and based on the transmission control information, A signal transmission method characterized in that at least the analog signal obtained by D / A converting the digital data is subjected to a predetermined conversion process for preventing illegal copying and a predetermined conversion process for digitally scrambling the digital data. . 10. The digital data is encrypted, and the predetermined conversion processing into the digital data is performed by encrypting the encryption applied to the digital data by using at least a part of the transmission control information as a key. 10. The signal transmission method according to claim 9, which is a process of decoding as information. 11. The digital data is encrypted data, and the predetermined conversion processing to the digital data is performed by encrypting the digital data.
10. The signal transmission method according to claim 9, which is a process of decoding by a decoding unit instructed by at least a part of the transmission control information. 12. A signal transmission device for receiving and reproducing transmitted digital data, means for extracting transmission control information for managing transmission accompanying the transmitted digital data, and a means for extracting the transmission control information based on the transmission control information. And at least means for performing a predetermined conversion process for preventing illegal copying on the analog signal obtained by D / A converting the digital data, and a predetermined conversion process for digitally scrambling the digital data. Characteristic signal transmission device. 13. The digital data is encrypted, and the predetermined conversion processing into the digital data is performed by encrypting the encryption applied to the digital data by using at least a part of the transmission control information as a key. 13. The signal transmission device according to claim 12, which is a process of decoding as information. 14. The digital data is encrypted data, and the predetermined conversion processing into the digital data is performed by encrypting the digital data.
13. The signal transmission device according to claim 12, wherein the signal is transmitted by a decoding unit instructed by at least a part of the transmission control information. 15. A signal transmission method for receiving and recording transmitted digital data, wherein transmission control information for managing transmission accompanying the transmitted digital data is taken out, and based on the transmission control information, At least an analog signal obtained by D / A converting the digital data is subjected to a predetermined conversion process for preventing illegal copying and a predetermined conversion process for digitally scrambling the digital data. Signal transmission method for. 16. The digital data is data to be encrypted, and the predetermined conversion process into the digital data is a process of encrypting the digital data with given key information. Item 16. A signal transmission method for recording according to item 15. 17. The digital data is data to be encrypted, and the predetermined conversion processing into the digital data is performed by encrypting the digital data by an encryption means designated by at least a part of the transmission control information. 16. The signal transmission method for recording according to claim 15, wherein the method is a processing for converting into a signal. 18. A signal transmission device for receiving and recording transmitted digital data, and means for extracting transmission control information for managing transmission accompanying the transmitted digital data, and a means for extracting the transmission control information based on the transmission control information. And at least means for performing a predetermined conversion process for preventing illegal copying on the analog signal obtained by D / A converting the digital data, and a predetermined conversion process for digitally scrambling the digital data. Signal transmission device for characterizing recording. 19. The digital data is data to be encrypted, and the predetermined conversion process into the digital data is a process of encrypting the digital data with given key information. Item 18. A signal transmission device for recording according to item 18. 20. The digital data is data to be encrypted, and the predetermined conversion processing into the digital data is performed by encrypting the digital data by an encryption means indicated by at least a part of the transmission control information. 19. The signal transmission device for recording according to claim 18, wherein the signal transmission device is a process for converting the signal. 21. A signal recording method for receiving transmitted analog data and recording the same on a recording medium, wherein transmission control information for managing transmission accompanying the transmitted analog data is detected, and the transmission control information is detected. Based on the above, at least the digital signal obtained by A / D converting the analog data is subjected to a predetermined conversion process for preventing illegal copying, and a predetermined conversion process for digitally scrambling the digital data is applied to the recording medium. A signal recording method, characterized in that the recording is performed on the. 22. The digital data is data to be encrypted, and the predetermined conversion process to the digital data is a process of encrypting the digital data with given key information. Item 21. The signal recording method according to Item 21. 23. The digital data is data to be encrypted, and the predetermined conversion processing into the digital data is performed by encrypting the digital data by an encryption means designated by at least a part of the transmission control information. 22. The signal recording method according to claim 21, wherein the signal recording method is a conversion process. 24. A signal recording device for receiving transmitted analog data and recording it on a recording medium, means for extracting transmission control information for managing transmission accompanying the transmitted analog data, and the transmission control. Based on the information, at least the digital signal obtained by A / D converting the analog data is subjected to a predetermined conversion process for preventing illegal copying, and a predetermined conversion process for digitally scrambling the digital data to perform the recording. A signal recording device comprising: a recording unit for recording on a medium. 25. The digital data is data to be encrypted, and the predetermined conversion process to the digital data is a process of encrypting the digital data with given key information. Item 24. The signal recording device according to item 24. 26. The digital data is data to be encrypted, and the predetermined conversion processing into the digital data is performed by encrypting the digital data by an encryption means designated by at least a part of the transmission control information. 25. The signal recording device according to claim 24, wherein the signal recording device is a processing for converting into a signal. 27. A digital disk device is used to reproduce a digital disk medium on which an encrypted video signal digitally scrambled with key information, a recording control code for controlling a mode of a reproduction state and key information are recorded. , Output an analog video signal with illegal copy protection, and input this analog video signal to analog VT
A combination device of a digital disk device for recording an analog video signal on a video tape in R and an analog VTR, wherein the digital disk device detects a state of the recording control code and the key information. Means for de-scrambling the encrypted video signal with the detected key information for the digitally scrambled encrypted video signal, and converting the de-scrambled digital data into an analog video signal for output In the analog VTR, the analog video signal is output from the analog video signal, and the analog video signal is output from the analog video signal. Detection output of the above-mentioned recording control code to prevent unauthorized copying in the output Based characterized in that it comprises a means for subjecting a recording scrambled signal aspect to be responsive to the recording means of the analog VTR, a digital disk device and combination device for analog VTR for the Prevention of illegal copying. 28. The means for performing illegal copy prevention processing on the analog video signal output is provided with a recording scramble signal in a manner to react with the automatic gain control means of the analog VTR capable of recording the analog video signal. 28. A digital disk device and an analog VT according to claim 27, which are means for preventing illegal copying.
R combination device. 29. The means for preventing illegal copying in the analog video signal output is provided with a phase-inverted color burst signal in a manner to react with the color signal processing means of the analog VTR capable of recording the analog video signal. 28. A digital disk device and an analog VT according to claim 27, which are means for preventing illegal copying.
R combination device. 30. The means for performing illegal copy prevention processing on the analog video signal output attaches an information signal in a manner to react with copy generation restriction control means of an analog VTR capable of recording the analog video signal. 28. A combined device of a digital disk device and an analog VTR according to claim 27, for preventing illegal copying. 31. The illegal copy characterized in that the descrambling means of the digital disk device is composed of a shift register, and an initial value of the shift register is set based on the key information. 28. A combined device of a digital disk device and an analog VTR according to claim 27, for preventing the above problem. 32. An illegal copy protection is performed by reproducing a digital disk medium on which an encrypted video signal digitally scrambled with key information, a recording control code for controlling a mode of a reproduction state and key information are recorded. Is a method of combining video signal reproduction and recording for outputting the analog video signal shown in FIG. 1 and inputting the analog video signal to record the analog video signal on the video tape in the analog VTR. In the video signal reproduction, the step of detecting the state of the recording control code and the key information, and the encrypted video signal with the detected key information for the digitally scrambled encrypted video signal. The process of de-scramble and the digital data that is descrambled Signal output by converting into an analog video signal and outputting the analog video signal on the basis of the detection output of the recording control code. In order to prevent illegal copying from being applied to the analog video signal output, a step of adding a recording scramble signal to the recording means of the analog VTR based on the detected output of the recording control code is included. A method of combining video signal reproduction and recording for preventing illegal copying, which is characterized by the above. 33. In the step of carrying out a process for preventing illegal copy in the analog video signal output, a recording scramble signal in a manner to react with an automatic gain control means of the analog VTR capable of recording the analog video signal is attached. 33. The method of combining video signal reproduction and recording according to claim 32, for preventing illegal copying, which is a process. 34. The step of performing the illegal copy prevention processing on the analog video signal output is provided with a phase-inverted color burst signal in a manner to react with a color signal processing means of an analog VTR capable of recording the analog video signal. 33. The method of combining video signal reproduction and recording according to claim 32, for preventing illegal copying, which is characterized by the step of: 35. The step of performing the illegal copy prevention processing on the analog video signal output is a step of attaching an information signal of a mode to react with a copy generation restriction control means of an analog VTR capable of recording the analog video signal. 33. The method for combining video signal reproduction and recording according to claim 32, wherein the illegal copy is prevented. 36. A shift register is used in the descrambling step of reproducing a video signal by the digital disk device, and an initial value of the shift register is set based on the key information. 33. The method of combining video signal reproduction and recording according to claim 32, for the purpose of preventing illegal copying.