JPH08339629A - Illegal copy preventing apparatus, recorder, reproducer and recording medium - Google Patents

Abstract

PURPOSE: To prevent illegal copy by recording digital data together with copy disabling signal when the data is recorded as copy disabling, encrypting the data by using an identification code, recording it and reproducing it. CONSTITUTION: When a copy inhibit signal is input from an input terminal 18, a switch 14 connects an input terminal 16 to a cryptographic processor 10 in response to the signal. An identification code made of 16 bits from an uneven detector 8 is converted to 64 bits four time repetition pattern corresponding to the processor 10 of 64 bit configuration to form the key of a 64-bit block cryption. The digital data is encrypted as the key of the 64-bit block cryption by the processor 10, and input to a data writer 12. The writer 12 sets a flag to a copy disabling state according to the copy disabling signal from the input terminal 18, records the signal from the processor 10 in a tape cassette 2, thereby preventing the illegal copy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to illegal recording of data, which is subject to copyright protection such as audio software and video software recorded as digital data, to a VTR, a recorder, a writable disc, or the like. The present invention relates to an unauthorized copy prevention device for preventing unauthorized copying (copying), a recording device, a reproducing device, and a recording medium used therein.

[0002]

2. Description of the Related Art A serial copy management system (commonly known as a serial copy management system in a serial interface of a digital audio tape recorder is known as a method for preventing unlimited copying of copyrighted works of software such as audio software and video software recorded as digital data.
SCMS method). This SCMS system basically permits various software to record digital data as it is for one generation.

FIG. 5 is a diagram showing a format structure of a digital audio interface signal. This signal is composed of a block of 192 frames, and each frame in the block is further composed of two subframes of channel 1 and channel 2.
A channel status signal is assigned to the 30th bit in each subframe, one bit at a time, and 192 bits for one block are collected for each channel to form a channel status signal.

FIG. 6 is a diagram showing the format of the channel status signal. In the format of the channel status signal, signals such as control code, category code, source number, channel number, sampling frequency and clock precision are incorporated. Of these, the second bit of the control code is the copy enable / disable signal. Copy permission of the 1-bit configuration of the second bit /
Deny signal and signal source category is compact disc (CD) or digital audio tape (DA
The permission / non-permission of copying is determined by a combination with a category code indicating the category of the signal source such as T).

When the signal source category is DAT, copy permission / non-permission is determined by the following procedure. That is, when the copy permission / non-permission signal in the control signal is the copy permission, the copy is permitted. If the copy permission / prohibition signal is not permitted and the category code is other than DAT, the DAT performs copying.
Record by changing the category code to a code indicating DAT. However, a code other than the code indicating DAT is also assigned to the DAT music tape. When the copy permission / non-permission code indicates that the copy is not permitted and the category code indicates DAT, the copy is not permitted. Therefore, it is possible to permit a single copy from the original even from a copy with a copy-disapproval code, and disallow a new copy from the copied one.

[0006]

However, in the above-mentioned method, the signal for determining permission / non-permission of recording is incorporated in a predetermined place with a predetermined value. Therefore, the configuration of these signals is changed. A person who knows, for example, a general record that does not carry out any special modification by converting the copy-permitted signal by reversing the pit indicating copy permission / non-permission in the control code or changing the category code. There is a problem that the device can be easily copied.

Therefore, according to the present invention, when the reproduction is performed, the reproduction can be correctly performed regardless of whether or not the copy is permitted, and the copy can be easily recorded as the disapproved data and the copy is not permitted. It is an object of the present invention to provide an unauthorized copy preventing apparatus which makes it difficult to illegally copy unauthorized data and illegally copy the authorized data, and a recording apparatus, a reproducing apparatus and a recording medium which realize the unauthorized copy preventing apparatus.

[0008]

In order to achieve such an object, in the illegal copy preventing apparatus of the first invention, a recording apparatus for recording digital data on a recording medium, and a recording apparatus for recording digital data on the recording medium are provided. A reproducing device for reproducing certain digital data, wherein the recording device includes an identification code detecting means (recording side identification code detecting means) for detecting an identification code fixedly provided on the recording medium; An encryption processing means for encrypting data and a data writing means for writing the digital data in the recording medium are provided, and when the digital data is recorded as copy disapproval, it is recorded together with a copy disapproval signal, and When recording, the digital data is encrypted and recorded using the identification code detected by the identification code detecting means. The reproducing device includes an identification code detecting means (reproducing side identification code detecting means) for detecting the identification code, a data reading means for reading digital data recorded on the recording medium, and a reproducing side identification code detecting means. A descrambling processing means for descrambling the cipher contained in the digital data read by the data reading means using the detection output of the means, wherein the copy prohibition signal is included in the digital data read by the data reading means. If it is, the deciphering processing means deciphers the digital data using the identification code read by the reproduction side identification code detecting means and reproduces the digital data. I am trying.

The recording device in the unauthorized copy prevention device according to the first aspect of the invention preferably further comprises the encryption processing means when the digital data to be recorded is not permitted to copy.
In the case of copy permission, there is a switch means (recording side switch means) for outputting to the data writing means,
The encryption processing means may encrypt the digital data given through the switch means with the identification code from the identification code detecting means and output the data to the data writing means when the copy is not permitted. . First
The reproducing apparatus in the illegal copy preventing apparatus according to the invention preferably further relates to reproducing processing means for reproducing digital data into analog data, and data indicating copy permission in the digital data read by the data reading means. Switch means (playback side switch means) for connecting the data reading means to the reproduction processing means and for connecting the deciphering processing means to the reproduction processing means in relation to the data indicating that copying is not permitted. There is. First
The data writing means in the unauthorized copy prevention apparatus of the invention preferably writes the digital data to the recording medium including header information including a flag indicating permission or prohibition of copying of the digital data. Further, it has a header detecting means for detecting the header information in the digital data read by the data reading means, and the header detecting means controls the reproduction side switch means if the flag in the header information is copy permission. It may be connected to the data reading means side and may be connected to the descrambling processing means side when copy is not permitted.

The recording apparatus of the second invention comprises an identification code detecting means for detecting the identification code of the recording medium, an encryption processing means for encrypting the digital data, and a data writing means for writing the digital data in the recording medium. When the digital data is recorded as a copy disapproval, it is recorded together with a copy disapproval signal, and at the time of this recording, the identification code detected by the identification code detecting means is used for the digital data. It is characterized by being encrypted and recorded. In this case, the identification code detecting means has a plurality of protrusions corresponding to the concavo-convex pattern with respect to the recording medium on which the concavo-convex pattern composed of the combination of the convex portion and the concave portion is provided as the identification code. is there.

The reproducing apparatus of the third invention comprises an identification code detecting means for detecting an identification code of a recording medium to be reproduced, a data reading means for reading digital data recorded on the recording medium, and the identification code detecting means. And a descrambling processing means for descrambling the cipher contained in the digital data read by the data reading means by using the detection output of the data reading means, and the digital data read by the data reading means includes a copy disapproval signal. In this case, the deciphering processing means deciphers the digital data using the identification code read by the identification code detecting means, and reproduces the digital data.

The recording medium of the fourth invention is a cassette type, and is characterized in that an identification code for identifying the recording medium is fixedly provided. This identification code may be provided with a concavo-convex pattern formed of a combination of a convex portion and a concave portion at a predetermined position on the cassette surface.

The recording medium of the fifth invention is a disc type, has a read-only area on its disc surface, and an identification code for identifying the recording medium is written in this read-only area. Is characterized by.

An unauthorized copy preventing apparatus according to a sixth aspect of the present invention has a recording / reproducing apparatus having a recording function of recording digital data on a recording medium and a function of reproducing digital data recorded on the recording medium. The recording / reproducing apparatus includes an identification code detecting means (recording side identification code detecting means) for detecting an identification code of the recording medium on the recording side,
An encryption processing means for encrypting the digital data, and a data writing means for writing the digital data in the recording medium are provided, and when the digital data is recorded as copy disapproval, it is recorded together with a copy disapproval signal. Further, at the time of this recording, it operates so as to encrypt and record the digital data using the identification code detected by the identification code detecting means, and an identification code for detecting the identification code on the reproducing side. Detection means (reproduction-side identification code detection means), data reading means for reading digital data recorded on the recording medium, and digital data read by the data reading means using the detection output of the reproduction-side identification code detection means. Deciphering processing means for deciphering the cipher contained in the data, If the digital data read by the data reading means includes the copy disapproval signal, the deciphering processing means uses the identification code read by the reproduction side identification code detecting means to encrypt the digital data. Is released and the digital data is reproduced.

The copy fraud prevention device of the seventh invention is a recording device for recording digital data on a recording medium and a reproducing device for reading digital data recorded on the recording medium and reproducing the read digital data. The recording medium comprises a recording / reproducing device having the recording / reproducing function, the recording medium has an identification code indicating the recording medium, and the recording device includes a reading unit for reading the identification code of the recording medium and data to be recorded. When data is recorded without permission, a code indicating that the copy is not permitted is recorded, and the identification code of the recording medium obtained by reading the record data by the reading unit is used as an encryption parameter. Is recorded by being encrypted by the encryption processing means, and the reproducing device identifies the recording medium. A read means for reading the code, a decryption means, an analog output means, and a digital output means, and when the data in which the code indicating the copy disapproval is recorded in the recording medium to be reproduced is reproduced, the reading means records it. Data which is read from the identification code of the medium, decrypted by the decryption means using the identification code as a decryption parameter, and then reproduced from the analog signal is output from the analog output means, and the digital output means does not perform the decryption processing. The feature is that it outputs only.

The reproducing apparatus of the eighth invention comprises a reading means for reading the identification code of the recording medium, a decryption means, an analog output means and a digital output means, and a code indicating that copying is not permitted in the recording medium to be reproduced. When reproducing the recorded data, the reading means reads the identification code of the recording medium, and the decryption means decrypts the identification code using the identification code as a decryption parameter, and then reproduces the reproduced signal into an analog signal from the analog output means. Output,
The digital output means is characterized in that it outputs only the data which is not subjected to the decryption processing.

[0017]

In the illegal copy preventing apparatus according to the first and sixth aspects of the invention, the digital data for which copying is not permitted (copy prohibited) is encrypted and output when the recorded digital data is output as it is, Since the key for decrypting the code is fixedly dependent on the recording medium, it is never copied. Therefore, even if it is recorded on a recording medium having a different identification code, it cannot be reproduced correctly, so that illegal copying can be effectively prevented. To copy this illegally, you must search for a recording medium with the same identification code, create the recording medium, or decipher the code. It is difficult to find the same identification code by making the code more complicated, and since it is difficult for those who do not have the creation device to create the recording medium itself, it is not easy to copy it. Can not.

With the configuration of the recording apparatus according to the second aspect of the present invention, it is possible to generate recording data in which illegal copying is prohibited.

According to the structure of the reproducing apparatus of the third invention, the second
Since the data recorded by the recording apparatus of the present invention is decrypted and reproduced, and the data after the decryption processing is not output to the outside, an illegal copy can be prevented.

Since the identification code is integrated by the configuration of the recording medium of the fourth and fifth inventions, it can be used as the recording medium of the copy protection apparatus of the first invention and can be used for other recording media. Can be exchanged.

With the configuration of the copy fraud prevention device according to the seventh aspect of the invention, when the copy is permitted, the recorded digital data is subjected to analog reproduction processing and output, and when the copy is not permitted, the recorded digital data is decrypted and then subjected to the analog reproduction processing. Can be output.

With the configuration of the reproducing apparatus of the eighth invention, recorded digital data can be read and output as it is, regardless of whether copying is permitted or not.

[0023]

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

FIG. 1 is a block diagram of a copy protection device according to an embodiment of the present invention, and FIG. 2 is a perspective view of a magnetic tape cassette. In these drawings, 2 and 4 are magnetic tape cassettes as recording media, each of which is composed of a combination of a convex portion and a concave portion along the front end edge of the central portion thereof.
An uneven pattern having a bit structure is provided.

Reference numeral 6 denotes a recording device. The recording device 6 is fixedly provided on the magnetic tape cassette 2 and has an unevenness detecting portion 8 for detecting an unevenness pattern indicating the identification code, and a detection from the unevenness detecting portion 8. Cryptographic processing unit 10 for inputting output
And a data writing section 12 for inputting the cryptographic processing output from the cryptographic processing section 10 and a copy permission signal to write data to the magnetic tape cassette tape 2, and a cryptographic processing section 10 for digital data in response to the copy permission signal. The switch 14 is connected to the data writing unit 12 for input. The switch 14 has a contact point 14 a connected to the encryption processing section 10 and a contact point 14 b connected to the data writing section 12. The recording device 6 also has an input terminal 16 to which digital data to be recorded on the magnetic tape cassette tape 2 is applied and an input terminal 18 to which a copy permission signal is applied.

Reference numeral 20 is a reproducing device.
Is recorded on the magnetic tape of the magnetic tape cassette tape 4, and an unevenness detection unit 22 for detecting the unevenness pattern of the magnetic tape cassette 4, a descrambling processing unit 24 for inputting the detection output from the unevenness detection unit 22. It has a data reading unit 26 for reading the stored data, a header detecting unit 28, a switch 30, and a reproduction processing unit 32 for taking in the output of the descrambling processing unit 24 or the data reading unit 26 via the switch 30. The switch 30 includes a contact 30a connected to the data reading unit 26 and a decryption processing unit 2
4 and a contact point 30b connected to No. Playback device 2
0 is also an output terminal 34 for outputting digital data.
And an output terminal 36 for outputting analog data.

The recording device 6 and the reproducing device 20 are provided with a device for recording or reproducing a cassette tape such as a tape driving means, but these can be constructed by a known technique, and the present invention can be realized. Details are not shown here because no particular details are required.

The operation of using the magnetic tape cassette tapes 2 and 4 in the illegal copy protection apparatus having the recording apparatus 6 and the reproducing apparatus 20 according to the present embodiment configured as above will be described.

The procedure for recording digital data on the magnetic tape in the magnetic tape cassette 2 by the recording device 8 will be described separately for copying permission and copying non-permission. First, in the case of permitting copying and recording, a copy permission signal is given from the copy permission signal input terminal 18. As a result, the copy permission signal is given to the data writing unit 12, and at the same time, the switch 14 switches its movable contact to the contact 14b side for connecting the digital data input terminal 16 to the data writing unit 12 in response to the copy permission signal. To be In response to the input of the copy permission signal, the data writing unit 6 adds information such as signal type and time code to the digital data input through the switch 14 as header information, and then adds the magnetic data of the magnetic tape cassette 2. Record on tape. Further, in this recording, the header information is provided with a 1-bit flag indicating copy permission or copy non-permission. In this case, since the flag is copy permission, the flag is recorded as copy permission.

Next, a case where copying is not permitted will be described. When a copy prohibition signal, that is, a copy prohibition signal is input from the input terminal 18, the switch 14 is switched to the contact 14 a side so that the movable contact connects the input terminal 16 to the cryptographic processing unit 10 in response to this signal. At this time, the cryptographic processing unit 10 is provided with the magnetic tape cassette 2 from the unevenness detection unit 8.
The detection output of the concavo-convex pattern indicating the identification code therein is given. Here, the encryption processing unit 10 is configured by a 64-bit block cipher. As the block cipher algorithm, a known one represented by DES or FEAL can be used. The 16-bit identification code from the unevenness detection unit 8 is simply converted into 64-bits that are repeated four times in correspondence with the 64-bit-structured encryption processing unit 10 and processed as a 64-bit block cipher key. To be done. Therefore, switch 1
The digital data provided to the cryptographic processing unit 10 via 4 is encrypted in the cryptographic processing unit 10 as a block number key based on the concave-convex pattern, and then sent to the data writing unit 12. In the data writing section 12 to which the encrypted digital data is given from the cryptographic processing section 10, the flag of the header section is set to the copy non-permission state according to the copy non-permission signal from the input terminal 18, and then the cryptographic processing section 10 The signal from is recorded on the magnetic tape of the magnetic tape cassette 2.

Here, the relationship between the concavo-convex pattern indicating the identification code of the magnetic tape cassette 2 and the concavo-convex detecting section 8 will be described in detail with reference to FIGS.
Concavo-convex patterns 2a1, 2a2 ...
Shows a magnetic tape cassette 2 having ... The concavo-convex patterns 2a1, 2a2, ... Are expressed by forming recesses with a depth of 3 mm on the cassette surface when a bit "0" is shown at 3 mm intervals and 5 mm width from a position 3 cm from the right end of the magnetic tape cassette 2. However, when the bit "1" is indicated, the surface is the same as the cassette surface. In the figure, as an example, a bit string “1010110011 with 16 identification codes” is used.
The uneven pattern 2a1, 2a2 which is "111111" ...
Is shown. The unevenness detection unit 8 in FIG. 1 specifically has a shape as shown in FIG. That is, the unevenness detection unit 8
Is an uneven pattern 2a1, 2a of the magnetic tape cassette 2.
16 small switch rows 801-8 corresponding to 2 ...
Each of the 16 switches 801 to 816 comprises a protrusion a1 having a length corresponding to the depth of the recesses of the concavo-convex patterns 2a1, 2a2 ... Provided on the magnetic tape cassette 2. ~ A16, and the protrusion a
Concavo-convex patterns 2a1, 2a2 with which 1 to a16 contact ...
For example, in the case of the convex portion 2a1, the corresponding protrusion a1 is pushed in and the built-in switch corresponding to the protrusion a1 is turned on. On the contrary, when the concavo-convex patterns 2a1, 2a2, which are in contact with each other, are the concave portions 2a2, the corresponding protruding portions a2 remain as they are.
The built-in switch corresponding to 2 is turned off. Therefore, the concavo-convex pattern 2a1 of the magnetic tape cassette 2 is
2a2 ... Is detected by turning on / off each switch of the switch array.

Next, the operation of the reproducing apparatus 20 will be described. The data reading unit 26 reads digital data recorded on the magnetic tape of the magnetic tape cassette 4. The read digital data is output from the output terminal 34 to the digital interface as it is, and at the same time, the decryption processing unit 24, one contact 30a of the switch 30,
It is sent to the header detector 28. The header detection unit 28 sends data required for reproduction from the header in the digital data from the data reading unit 26 to the reproduction processing unit 32, detects a signal indicating copy permission / non-permission, and permits / prohibits the copy. The detection output of the signal is sent to the switch 30. When the switch 30 sends the data read by the data reading unit 26 to the reproduction processing unit 32 in response to the detected output, the digital data read by the data reading unit 26 is directly reproduced via the contact 30a.
Or to send the digital data after decryption through the contact 30b. That is, when the detection output from the header detection unit 28 is copy-permitted, the switch 30 responds to this detection output and contacts 30
a is connected to the data reading unit 26 and the digital data read by the data reading unit 26 is reproduced by the reproduction processing unit 32.
When the detection output from the header detection unit 28 is copy disapproval, the contact 30b is connected to the descrambling processing unit 24 in response to this detection output, and the descrambling processing unit is connected. It operates so as to send the output of 24 to the reproduction processing unit 32.

In the descrambling processing section 24, the unevenness detecting section 22 having the same structure as the unevenness detecting section 8 in the recording apparatus reads the identification code composed of the uneven pattern of the magnetic tape cassette 4 and then the The read identification code is sent to the descrambling processing unit 24. Then, the descrambling processing unit 24 deciphers the digital data from the data reading unit 26 using the identification code from the unevenness detection unit 22 as a deciphering key, and outputs the digital data. Thus, the digital data from the data reading unit 26 is directly input to the reproduction processing unit 32 when the copy is permitted, and the encryption of the digital data read by the data reading unit 26 is performed when the copy is not permitted. It will be given after being canceled at. Then, the reproduction processing unit 32 reproduces the data in the header of the digital data from the digital data into an analog video signal and outputs the analog video signal to the analog interface via the output terminal 36.

As described above, according to this embodiment, it is possible to prevent illegal copying without deterioration at the digital data level, which will be described in detail.

First, in the case where the digital data recorded in the magnetic tape cassette 2 is encrypted and recorded because the recording device 6 prohibits copying,
It is impossible to reproduce the digital data recorded on the magnetic tape cassette 1 by a reproducing device having neither an identification code detecting means nor a descrambling section.

Next, the reproducing apparatus 20 is set with a magnetic tape cassette (reproducing apparatus-side magnetic tape cassette) recorded as copy-inhibited by using the recording apparatus 6 described above, and the digital data recorded in the cassette is set. A magnetic tape cassette (recording device side) which is set to the recording device 6 through the input terminal 16 of the recording device 6 through the digital interface connected to the output terminal 34 while reading the data In some cases, it may be sent to a magnetic tape cassette) to try dubbing. In this case, the digital data output from the data reading unit 26 of the reproducing device 20 and given through the output terminal 34 is data encrypted with the identification code of the reproducing device side magnetic tape cassette. Therefore, when the recording device side magnetic tape cassette is set in the recording device 6 and a copy permission signal is given for recording, the recording device side magnetic tape cassette is encrypted with the identification code of the reproducing device side magnetic tape cassette. The converted data will be recorded as it is. Further, when the reproducing apparatus side magnetic tape cassette is set in the reproducing apparatus 20 and the recording apparatus side magnetic tape cassette is set in the recording apparatus 6 and recording is made as copy disapproval, the recording apparatus side magnetic tape cassette is set. Is encrypted with the identification code of the magnetic tape cassette on the reproducing device side, and then is also encrypted with the identification code of the magnetic tape cassette on the recording device side. When attempting to reproduce the former magnetic tape cassette on the recording device side with the reproducing device, this time, the identification code of the magnetic tape cassette on the reproducing device side, which is different from the identification code of the magnetic tape cassette on the recording device side, is used to decrypt the code. , The one made by illegal copy cannot be reproduced correctly. In the latter case, the encryption is doubled, and the encryption by the identification code of the recording device side magnetic tape cassette is released, but it is encrypted by the identification code of the first reproducing device side magnetic tape cassette. It cannot be played back correctly because it cannot be released. Therefore, in the case of this embodiment, it is possible to prevent illegal copying without deterioration at the digital data level.

In this embodiment, the recording device 6 and the reproducing device 20 are shown, but a recording / reproducing device having a recording function and a reproducing function at the same time can be considered as a device in the system according to the present embodiment. The recording process and the reproducing process in this case can be realized by performing the same process as the recording device and the reproducing device shown in the present embodiment.

In this embodiment, a magnetic tape cassette is shown as an example of the recording medium, but other recording media such as an optical disc can also be prevented from being illegally copied by providing the identification code. Further, means other than the concavo-convex pattern may be used as means for giving the identification code at that time. For example, FIG. 4 is an explanatory diagram when the identification code is provided on the disk 38. In addition to the readable / writable area 40 on the disk 38, a read-only area 42 is provided on the center side of the area 40, and the identification code is written in the area 42, so that a recording medium having the identification code can be realized. By using the recording device and the reproducing device at that time as the disc reproducing and recording device and changing the concave-convex detecting unit to the data reading means of the read-only area 42 on the disc, an illegal copy prevention device in the case of the disc can be realized.

Further, even if different media such as tapes and disks are operated with the unified specifications of the number of bits of the identification code and the cryptographic processing, illegal media between different media such as tapes to disks and disks to tapes can be tampered with. Copying can also be prevented.

Further, although the number of bits of the identification code is 16 bits in the present embodiment, the number of bits may be increased or decreased within a range where it is difficult to find a code having an identification code of the same bit pattern. The identification code may be given by, for example, assigning a production number for producing the recording medium, or by simply using a random number and assigning the identification code at random.

In the above embodiment, the identification code of the magnetic tape cassette has a concavo-convex pattern provided on it, but an identification code area is provided on the magnetic tape in the magnetic tape cassette, and the magnetic tape is provided in this identification code area. It is also possible to add a code that can identify the magnetic tape cassette.In addition to the unevenness on the surface of the magnetic tape cassette, a light reflecting film is provided and this light reflecting film is used as the identification code, or the identification code is used in the form of a bar code. It may be added.
In this case, the unevenness detection unit 8 as the identification code detection unit of the recording device 6 or the unevenness detection unit 20 as the identification code detection unit of the reproduction device 20 may change the detection configuration accordingly.

The switch 1 in the above embodiment
4, 30 can be composed of electronic circuits, for example, logic circuits.

[0043]

As described above, according to the present invention, it is possible to prevent illegal copying without deterioration at the digital data level, and its practical effect is great.

[Brief description of drawings]

FIG. 1 is a block diagram of an unauthorized copy protection device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a magnetic tape cassette tape which is the recording medium of FIG.

FIG. 3 is a diagram showing a specific configuration of an unevenness detection unit in FIG.

FIG. 4 is a plan view of a disc which is another example of the recording medium of FIG.

FIG. 5 is a structural diagram of a format of a digital audio interface signal.

FIG. 6 is a configuration diagram of a format of a channel status signal.

[Explanation of symbols]

 2, 4 magnetic tape cassette tape 6 recording device 8 unevenness detection unit 10 encryption processing unit 12 data writing unit 14 switch 20 playback device 22 unevenness detection unit 24 deciphering processing unit 26 data reading unit 28 header detection unit

Claims (13)

[Claims] 1. A recording device which records digital data on a recording medium, and a reproducing device which reproduces digital data recorded on the recording medium, wherein the recording device is fixedly provided on the recording medium. An identification code detecting means (recording-side identification code detecting means) for detecting the identified identification code, an encryption processing means for encrypting the digital data, and a data writing means for writing the digital data in the recording medium. When the digital data is recorded as a copy disapproval, it is recorded together with a copy disapproval signal, and at the time of this recording, the digital data is encrypted and recorded using the identification code detected by the identification code detecting means. The reproducing device is an identification code detecting means for detecting the identification code (a reproducing side identification code detecting means). ), The data reading means for reading the digital data recorded on the recording medium, and the detection output of the reproduction side identification code detecting means for deciphering the cipher contained in the digital data read by the data reading means. Deciphering processing means, and when the digital data read by the data reading means includes the copy disapproval signal, the identification read by the reproduction side identification code detecting means by the deciphering processing means. An unauthorized copy prevention device characterized by deciphering the digital data using a code and reproducing the digital data. 2. The recording device further outputs a switch means (recording side switch means) for outputting the digital data to be recorded to the encryption processing means when the copying is not permitted and to the data writing means when the copying is permitted. ), The encryption processing means encrypts the digital data given through the switch means when the copy is not permitted with the identification code from the identification code detecting means, and writes the data to the data writing means. The illegal copy protection device according to claim 1, wherein the illegal copy protection device outputs the data. 3. The reproducing apparatus further includes reproducing processing means for reproducing digital data into analog data, and the data reading in relation to data indicating copy permission in the digital data read by the data reading means. Means for connecting to the reproduction processing means, and switch means (reproduction side switch means) for connecting the descrambling processing means to the reproduction processing means in association with data indicating that copying is not permitted. The unauthorized copy protection device according to Item 1 or 2. 4. The data writing means writes the digital data on the recording medium together with header information including a flag indicating permission or prohibition of copying of the digital data, and the reproducing device further reads the data. The header detecting means detects the header information in the digital data read by the means, and the header detecting means reads the data from the reproducing side switch means when the flag in the header information is copy permitted. 4. The illegal copy protection apparatus according to claim 1, wherein the unauthorized copy protection device is connected to the encryption decryption processing means side when the copy is not permitted. 5. An identification code detecting means for detecting an identification code of a recording medium, an encryption processing means for encrypting digital data, and a data writing means for writing the digital data in the recording medium, When the digital data is recorded as the copy disapproval, it is recorded together with the copy disapproval signal, and at the time of this recording, the digital data is encrypted and recorded by using the identification code detected by the identification code detecting means. Characteristic recording device. 6. The identification code detecting means has a plurality of protrusions corresponding to the concavo-convex pattern with respect to a recording medium provided with a concavo-convex pattern composed of a combination of a convex portion and a concave portion as an identification code. The recording apparatus according to claim 5, wherein the recording apparatus comprises: 7. An identification code detecting means for detecting an identification code of a recording medium to be reproduced, and a data reading means for reading digital data recorded on the recording medium,
Decryption processing means for deciphering the cipher contained in the digital data read by the data reading means using the detection output of the identification code detecting means, and not permitting copying to the digital data read by the data reading means. When a signal is included, the deciphering processing means deciphers the digital data using the identification code read by the identification code detecting means, and reproduces the digital data. Playback device. 8. A recording medium of a cassette type, wherein an identification code for identifying the recording medium is fixedly provided. 9. The recording medium according to claim 8, wherein the identification code is formed at a predetermined position on the cassette surface in a concavo-convex pattern including a combination of a convex portion and a concave portion. 10. A recording medium, which is a disk type, has a read-only area on its disk surface, and an identification code for identifying the recording medium is written in the read-only area. 11. A recording / reproducing apparatus having a recording function of recording digital data on a recording medium and a function of reproducing the digital data recorded on the recording medium, wherein the recording / reproducing apparatus comprises the recording device. An identification code detecting means for detecting the identification code of the recording medium (recording side identification code detecting means), an encryption processing means for encrypting the digital data, and a data writing means for writing the digital data in the recording medium. When the digital data is recorded as a copy disapproval, it is recorded together with a copy disapproval signal, and at the time of this recording, the digital data is encrypted using the identification code detected by the identification code detecting means. And an identification code detection for detecting the identification code on the reproducing side. Stage (playback side identification code detecting means), data reading means for reading digital data recorded on the recording medium, and digital data read by the data reading means using the detection output of the playback side identification code detecting means. When the digital data read by the data reading means includes the copy disapproval signal, the descrambling processing means for descrambling the cipher included in An unauthorized copy preventing apparatus, characterized in that it operates so as to decipher the digital data by using the identification code read by the identification code detecting means and reproduce the digital data. 12. A recording medium, a recording device for recording digital data on the recording medium, a reproducing device for reading digital data recorded on the recording medium and reproducing the read digital data, or the recording / reproducing function. The recording medium has an identification code indicating the recording medium, the recording apparatus includes a reading unit that reads the identification code of the recording medium, and an encryption code that encrypts data to be recorded. When the data is recorded without permission, a code indicating that the data is not permitted is recorded, and the encryption processing is performed by using the identification code of the recording medium obtained by reading the recorded data by the reading means as an encryption parameter. Means for encrypting and recording, and the reproducing device comprises a reading means and a decryption means. And an analog output unit and a digital output unit, and when reproducing the data in which the code indicating the copy disapproval is recorded in the recording medium to be reproduced, the reading unit reads the identification code of the recording medium, The deciphering means performs deciphering processing using the identification code as a deciphering parameter, and then reproduces the analog signal from the analog output means, and the digital output means outputs only the data not subjected to the deciphering processing. Unauthorized copy protection device. 13. A reproducing means, a decryption means, an analog output means, and a digital output means are provided, and when reproducing data in which a code indicating non-permission of copying is recorded in a recording medium to be reproduced, The reading means reads the identification code of the recording medium, the decryption means performs decryption processing using the identification code as a decryption parameter, and then reproduces an analog signal, which is output from the analog output means, and the digital output means decrypts the code. A reproducing apparatus which outputs only data that has not been processed.