JP2001229614A - Data recorder, data reproducing device, data recording method and data reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent data with copyright from being illicitly recorded or reproduced. SOLUTION: In a bit stream recording and reproducing device provided with digital input/output and analog input/output or an RTRW recording and reproducing device, an appropriate WM detection control means and the encoding/decoding of cipher are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for recording and / or reproducing image and audio data.
In particular, the present invention relates to a technique for controlling recording / reproducing or reproducing / recording operation according to copy management information of a recording medium.

[0002]

2. Description of the Related Art A DVD-ROM is a medium having about seven times the capacity of a CD-R. For this purpose, movie software can also be recorded by compressing video and audio data as well as PC program codes. Recording media for recording data on DVDs include DVD-RAM and DVD-RAM.
R and DVD-RW. Since a large amount of data can be recorded in these, it is necessary to prevent digital copying of software such as a movie as it is. For this reason, illegal copy prevention technology becomes important.

As one of the techniques, there is a digital watermarking technique, and its standardization is described in "Nikkei Electronics" (Nikkei Electronics, Inc., Nikkei BP, May 31, 1998, pp. 31-32).

In addition to the digital watermarking technology, IEEE
A technique for preventing unauthorized copying in exchanging data between devices using 1394 is also described in "Nikkei Electronics" (Nikkei Electronics, Inc., P47-P53, 1998.23).

[0005]

However, DVD-RA
It is difficult or impossible to prevent unauthorized copying of devices with digital / analog inputs and outputs, such as the M drive, using only these techniques. Further, since more complicated data is exchanged inside the PC, a loophole of the copy control is likely to occur.

For this reason, digital watermarking technology and IEEE13
It is required to construct a system that uses a plurality of copy control techniques in an appropriate combination, including 94 copy prevention techniques.

[0007] The present invention has been made in view of the above points,
Its purpose is to provide a bit stream recording / reproducing apparatus having digital / analog input / output or RTR.
It is to prevent copyrighted data from being illegally recorded or reproduced in a W recording / reproducing apparatus.

[0008]

To achieve the above object, the present invention provides, for example, an input terminal for inputting digital data, an interface for receiving transferred digital data, and an input for inputting an analog signal. Terminal, AD conversion means for converting an analog signal into a digital signal, compression means for compressing the converted digital signal, and recording for recording the transferred digital data and the compressed digital signal on a recording medium. A data recording device comprising: a recording processing unit for performing processing; and a recording unit for recording data on a recording medium, wherein the interface unit decrypts the digital data when the digital data is encrypted. Means for detecting digital watermark information from the decoded digital data;
Detecting means, and a first means for encrypting the digital data.
The compression means includes second detection means for detecting digital watermark information, and second encryption means for encrypting the compressed data.

The present invention also provides, for example, a reproducing means for reproducing data from a recording medium, a reproducing processing means for reproducing data read from the recording medium, and an interface means for transmitting digital data after the reproducing processing. A data reproducing apparatus comprising: an output terminal for outputting digital data; an expanding means for expanding reproduced data; a DA converting means for converting a digital signal into an analog signal; and an output terminal for outputting an analog signal. Wherein the interface means comprises: first decryption means for decrypting the encryption when the digital data after the reproduction processing input to the interface means is encrypted;
A first detecting means for detecting digital watermark information from the decrypted digital data; and a first encrypting means for encrypting the digital data. In the case where the encryption has been performed, a second decryption unit for decrypting the encryption is provided, and the decompression unit includes a second detection unit for detecting the digital watermark information.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a recording / reproducing apparatus for recording / reproducing data including copy control information according to an embodiment of the present invention. In the present embodiment, for example, D
An example of application to a device that performs recording and reproduction such as a VD-RAM drive will be described. However, the present invention is not limited to a recording and reproduction device, but is also applicable to a recording device and a reproduction device. It should be understood that the recording / reproducing device of the present embodiment (and the embodiment described later) includes a recording device and a reproducing device as a part thereof.

In the following description, an interface for data transfer (hereinafter, referred to as I / F) will be described as IEEE.
Take 1394 as an example, but besides this as an I / F,
ATAPI, SCSI, USB, etc. are considered, and I / F
Is not particularly limited. Further, the present embodiment (and an embodiment to be described later) is, for example, a DVD-R
An apparatus for recording / reproducing data on / from a recordable / reproducible medium such as an AM will be described. However, the recording medium is not limited to an optical disk, but applies to all recording media for recording / reproducing or reproducing data.

In FIG. 1, reference numeral 10 denotes a DVD-RAM drive capable of recording / reproducing a bit stream (Bit-stream), 11 denotes a digital input terminal, and 12 denotes an IEEE 139.
4 I / F, 13 is an analog input terminal, 14 is a DVD video / audio encoder, 15 is a DVD error correction code adding means, 16 is a DVD disk, 17 is a microcomputer, 18 is servo means, 19 is DVD error correction means, 20 Is an IEEE1394 I / F, 21 is a DVD video / audio decoder, 22 is a digital output terminal,
23 is an analog output terminal.

Next, the operation of this embodiment will be described.

Here, first, a moving image or audio data is compressed by a method such as MPEG (Moving Picture Experts Group) or the like, and a DVD is recorded in a bit stream data sequence.
-The operation of the RAM drive will be described. DVD-R
The signal input to the AM drive 10 may be a digital signal input or an analog signal input. Therefore, the DVD-RAM drive 10
It is necessary to provide processing means so that processing can be performed on either signal. The operation for each input will be described with reference to FIGS.

FIG. 2 shows the IEEE 1394I shown in FIG.
/ F12 is shown. In FIG.
1 is an IEEE 1394 signal receiving means, 32 is DTCP
(DTCP means for performing copy control according to a method adopted in (Digital Transmission Content Protection)) 33
CG processing means for performing copy control in accordance with a CG (Contents Guard) method; 34, decoding means for M6 encryption; 35, detection of a watermark (digital watermark; hereinafter, referred to as WM); Control means, 36
Is an encryption 1 encoder that performs a predetermined encryption.

A signal received by a digital input through the IEEE 1394 I / F is received by the IEEE 1394 signal receiving means 31, and transfer data is extracted. DT
The CP unit 32 protects contents transmitted on the IEEE 1394 bus by authentication between devices, copy control transmission, and content encryption. A key for mutual authentication and decryption between devices performing data transfer is provided. After passing the information, the CG processing unit 33 updates the received key information and records the new key information as recording information.

Here, the transfer data having a copyright such as a copyright is encrypted so that the data cannot be read during the transfer. IEEE
1394 employs M6 encryption. Those without the right are transmitted as clear signals without encryption.

Therefore, the M6 ciphered data is decoded by the decoding means 34 into the M6 cipher and the WM
The data is set as detectable data, and the
M is detected, and the output is controlled according to the detection result.
As a result of the WM detection, if the data is not illegally copied data but data that is permitted to be recorded on a recording medium, predetermined encryption is performed by the encryption 1 encoder 36, and DV
It is sent to the D error correction code adding means 15. Here, the cipher 1 may use the same cipher as the M6 cipher. By using the same cipher, the decryption circuit for the cipher can be shared, so that the circuit can be simplified.

In addition, WM detection is performed for unencrypted data because there is a possibility that the data was copied illegally. When the WM is detected, the WM is controlled according to the WM. If necessary, a predetermined encryption is performed by the encryption 1 encoder 36 and sent to the DVD error correction code adding means 15.

In the WM detection, if the copy control information needs to be updated for recording on a DVD disk, the WM is updated before encryption.

The WM detection control means 35 is an IEEE 139
The WM detection is performed on the transfer data from the four-signal receiving means 31. If this WM detection can be detected as it is from the transferred data, detection is performed from that state. For example, although the transfer data is a bit stream by MPEG compression, it corresponds to detection from the baseband state. If the WM is detected, the bit stream is temporarily converted to the baseband to detect the WM, and then the WM is inversely converted back to the original state. Here, the level to be converted does not need to be completely converted to baseband,
The conversion may be performed up to a stage where WM detection is possible. The MPEG encoder / decoder used at this time can also be used as the DVD video / audio encoder 14 and the DVD video / audio decoder 21.

Here, the MPEG compression conversion has been described, but if necessary for WM detection, conversion or a part of the conversion is performed according to the WM detection method, and after the WM detection, reverse conversion to the original state is performed. By doing so, it is possible to optimally perform WM detection. This conversion can also be applied when WM needs to be rewritten or added.

FIG. 3 shows the configuration of the DVD video / audio encoder 14 in FIG. In the figure, 41 is an AD converter, 42 is an MPEG encoder, 43 is WM detection control means, 44 is an M6 encryption encoder, and 45 is an encryption 2 encoder.

An analog signal such as a video signal or an audio signal is digitized by the AD converter 41. Although not shown here, in the case of a video signal,
A copy protection signal called a macro vision signal is added, and when this signal is detected, control is performed to prohibit copying.

Next, the digitized data is stored in the MPE
It is compressed by a compression method such as G. At the same time, the WM is detected by the WM detection control 43, and when the WM is detected, control is performed according to the WM. If no WM is detected or the WM indicates that the data has no right, it is not necessary to encrypt the data to be recorded.
After the EG encoding, it is sent to the DVD error correction code adding means 15 as it is.

As a result of the WM detection, if the data is not illegally copied data but data that is permitted to be recorded on a recording medium, predetermined encryption is performed by the M6 encryption encoder 44 or the encryption 2 encoder 45, It is sent to the DVD error correction code adding means 15.

In the WM detection, if the copy control information needs to be updated for recording on the DVD disk, the WM is updated and then the encryption is performed. Here, encryption 2 is M6
The same encryption as the encryption or the M1 encryption may be used. By using the same cipher, the decryption circuit for the cipher can be shared, so that the circuit can be simplified.

As described above, the IEEE1 shown in FIGS.
The output from the 394 I / F 12 and the DVD video / audio encoder 14 is received, and a code for error correction is added by the DVD error correction code adding means 15 in FIG. I do. Microcomputer 17
Performs system control for recording and reproduction, controls the servo means 18, and controls rotation and access of the DVD disk. Also, exchange of key information in the CG processing shown in FIG. 2 is performed.

During reproduction, there are a digital output system and an analog output system as in the case of recording, and the operation for each output will be described with reference to FIGS.

FIG. 4 is a diagram showing the IEEE 1394I shown in FIG.
/ F20 is shown. In FIG.
Reference numeral 1 denotes CG processing means for performing copy control in accordance with a CG (Contents Guard) method; 42, DTCP means for performing copy control in accordance with a method adopted in DTCP; 43, decoding means for M6 encryption; 44, CSS (Contents) Scramble Syste
m) decoding means, 45 is a decoding means for cipher 1, 4
6 is a decoding means for cipher 2, 47 is a WM detection control means for detecting WM and controlling according to it, and 48 is a PS for converting a program stream into a transport stream.
→ TS conversion means, 49 is M6 encryption encoder, 50 is I
EEE1394 signal receiving means.

The data reproduced from the DVD disk is
The signal is demodulated and error-corrected by the DVD error correction means 19 and sent to a digital output system and an analog output system.

The CG processing means 41 updates the key information included in the data, and uses the new key information as recording information in the DTC.
Send to P means 42. The DTCP means 42 performs mutual authentication between devices performing data transfer and exchanges key information for decrypting the data. Here, the transfer data having a right such as a copyright is transferred by encrypting the data so that even if the data is taken out during transfer, it cannot be read correctly. Those without the right are transferred as clear signals without encryption.

If the data after error correction is encrypted, it is decoded according to the encrypted method.
The data on the DVD-ROM disk is CSS-encrypted, and a decoder (decoding means 44) corresponding to the CSS is required. At the time of recording, the digital input system and the analog input system used the M6 cipher, the cipher 1, and the cipher 2, so that three corresponding decoders (decoding means 43, 45, and 46) were described. If these are recorded by using the same encryption, the decoder can be used correspondingly. W by each decoder
Decode up to M detectable data, and perform WM detection control 47
To control the output according to the detection result.

As a result of the WM detection, if the data is not the data recorded improperly, but the data for which data transfer is permitted, the data is encrypted by the M6 encryption encoder 49 and
The signal is sent to the EEE1394 signal receiving means 50.

In addition, WM detection is performed on unencrypted data because there is a possibility that the data has been illegally copied. If WM is detected here,
It is controlled according to the WM, performs M6 encryption if necessary, and sends it to the IEEE 1394 signal receiving means 50.

In the WM detection, if the copy control information needs to be updated, the WM is updated and then the encryption is performed. If the WM has already been updated at the time of recording and it is not necessary at the time of reproduction, the WM is not updated.

In this case, the PS → TS conversion means 48
Has been described as an example of processing after the WM detection control means 47, but WM detection control may be performed after the processing of the PS → TS conversion means 48. That is, PS → TS
The order of the conversion processing and the WM detection control can be interchanged. For example, FIG. 14 is obtained by replacing a part of the signal flow in FIG.

Here, the WM detection control means 47 performs WM detection on the reproduced data from the recording medium. If the WM detection can be directly detected from the reproduced data, the detection is performed from that state.
If the M detection corresponds to either the state of the transport stream or the state of the program stream, the WM detection is performed in an appropriate part of the stream conversion.
If WM detection is possible at an intermediate level of those streams, WM detection is performed using a signal of an appropriate level. Of course, once convert the stream,
After detecting the WM, it may be converted back to the original trim. Further, as shown in FIG. 4, when PS → TS conversion is not required, WM can be detected and output without conversion.

Also, while the reproduced data is a bit stream by MPEG compression, if the WM detection corresponds to the detection from the state of the base band, the bit stream is temporarily converted to the base band to detect the WM. After that, it is converted back to the original state. here,
The level to be converted need not be completely converted to the baseband, but may be converted to a stage where WM detection is possible.

As described above, by adopting a configuration for converting the data state to a level at which the WM can be detected, it is possible to prevent an extra circuit from increasing. Here, M
We described PEG compression and transfer stream conversion.
If it is necessary to detect M, it is possible to perform WM detection optimally by performing conversion or a part of conversion in accordance with the WM detection method, and performing reverse conversion to the original state after WM detection. Become. This conversion can also be applied when WM needs to be rewritten or added.

Here, the data to be transferred includes a transport stream (TS) and a program stream (PS).
There is a need to convert according to the data transfer. FIG. 5 shows the difference between the two types of streams in the MPEG-2 system. The transport stream is 1
It is used for ATM communication, digital broadcasting, and the like, in which an error easily occurs, in units of a fixed-length packet of 88 bytes.
The program stream is composed of a plurality of packs composed of a plurality of variable-length PES packets, and is stored on a CD-ROM.
Used for media in which errors are unlikely to occur, such as media and magnetic tape.

Because of the difference in the stream configuration, the stream reproduced from the DVD disc is
However, depending on the medium to be transferred, it is necessary to perform PS → TS conversion. Therefore, in FIG. 4, P
The stream is converted by the S → TS conversion means 48, and then the M6 encryption is performed.
Send to 0.

The data obtained by encoding the M6 code is IE
The data is output as transfer data from the digital output terminal 23 via the EE1394 signal receiving means 50.

FIG. 6 shows the structure of the DVD video / audio decoder 21 in FIG. In the figure, reference numeral 51 denotes decoding means for M6 encryption, and 52 denotes CSS.
53, decoding means for cipher 1; 54, decoding means for cipher 2; 55, an MPEG decoder;
Is a WM detection control means, and 57 is a DA converter.

The data reproduced from the DVD disk 16 is demodulated and error-corrected by the DVD error correction means 19,
Sent to digital output system and analog output system.

If the data after error correction is encrypted, it is decoded according to the encrypted method.
The data on the DVD-ROM disc is CSS-encrypted, and a decoder (decoding means 52) corresponding to the CSS is required. At the time of recording, there were three types of encryptions, M6 encryption, encryption 1, and encryption 2, in the digital input system and the analog input system. Therefore, three corresponding decoders (decoding means 51, 53, 54) are described. If these are recorded by using the same encryption, the decoder can be used correspondingly. It is decoded by each decoder, and is decoded by the MPEG decoder 55 into a video signal and an audio signal.

Here, the WM detection control means 56 controls the WM
And controls the output according to the detection result. W
As a result of the M detection, if the data is not the improperly recorded data but the data whose output is permitted, the data is output from the analog output terminal 23 via the DA converter 57. WM detection is also performed on unencrypted data since there is a possibility that the data has been illegally copied. Here, when WM is detected, control is performed according to WM.

In the WM detection, if the copy control information needs to be updated, the WM is updated and then encryption is performed. If the WM has already been updated at the time of recording and it is not necessary at the time of reproduction, the WM is not updated.

Although not shown here, in the case of a video signal, a copy protection signal called a macrovision signal is usually added. A signal is added to control to prohibit copying.

Here, in the description of FIGS. 2, 3, 4, and 6, the WM detection control means is shown independently for easy understanding, but the WM detection control means 35 is provided on the recording system side.
And the WM detection control means 43 can also be used, and the WM detection control means 47 and W
It is also possible to double as the M detection control means 56.

FIG. 7 is a block diagram showing a configuration of a recording and reproducing apparatus for recording and reproducing data including copy control information according to another embodiment of the present invention.

In the figure, reference numeral 70 denotes RTRW (Real Tim).
e-Read Write) DVD that can be recorded and played back in the format
RAM drive, 71 is digital input terminal, 72 is I
EEE1394 I / F, 73 is an analog input terminal, 74
Is DVD video / audio encoder, 75 is DVD
Error correction code adding means, 76 is a DVD disk, 77 is a microcomputer, 78 is servo means, 79 is DV
D error correction means, 80 is IEEE1394 I / F, 81
Is a DVD video / audio decoder, 82 is a digital output terminal, and 83 is an analog output terminal.

Next, the operation of this embodiment will be described.

First, the operation of the DVD-RAM drive for compressing moving picture and audio data by, for example, MPEG or the like, converting the data into the RTRW format, and recording the data will be described. The signal input to the DVD-RAM drive 70 may be a digital signal input or an analog signal input. Therefore, DVD-
The RAM drive 70 needs to be provided with processing means so as to be able to process either signal. The operation for each input will be described with reference to FIGS.

FIG. 8 is a diagram showing the IEEE1394I shown in FIG.
/ F72 is shown. In FIG.
9 is an IEEE 1394 signal receiving means, 82 is a DTCP means for performing copy control in accordance with the method adopted in the DTCP,
83 is a CG processing means for performing copy control according to the CG method;
84 is an M6 decoding means, 85 is a WM,
WM detection control means for performing control in accordance therewith; 86, an encryption 1 encoder for performing predetermined encryption; 87, TS → P for converting a transport stream into a program stream
S conversion means.

A signal received at a digital input via the IEEE 1394 I / F is received by an IEEE 1394 signal receiving means 89, and transfer data is extracted. DT
The CP unit 82 performs mutual authentication between devices that perform data transfer and exchanges key information for decrypting the data. The CG processing unit 83 updates the received key information and uses the new key information as recording information. Record.

Here, if the transfer data has a right such as a copyright, the data cannot be read during transfer by encrypting the data. IEEE
1394 employs M6 encryption. Those without the right are transmitted as clear signals without encryption.

Therefore, the M6 ciphered data is decoded by the decoding means 84 into the M6 cipher and the WM
The data is set as detectable data, and the WM detection
M is detected, and the output is controlled according to the detection result.
As a result of the WM detection, if the data is not the data copied illegally but the data permitted to be recorded on the recording medium, T
The format is converted by the S → PS conversion means 87, and thereafter, predetermined encryption is performed by the encryption 1 encoder 86, and the encrypted data is sent to the DVD error correction code adding means 75. Here, the cipher 1 may use the same cipher as the M6 cipher. By using the same cipher, the decryption circuit for the cipher can be shared, so that the circuit can be simplified.

In addition, WM detection is performed for unencrypted data, since there is a possibility that the data has been illegally copied. Here, when the WM is detected, the WM is controlled according to the WM, and if necessary, the encryption 1
The data is encrypted by the encoder 36 and sent to the DVD error correction code adding means 75.

In the WM detection, when the copy control information needs to be updated for recording on the disk, the WM is updated and then encryption is performed.

Although the TS → PS conversion means 87 has been described as an example of processing after the WM detection control means 85, the WM detection control may be performed after the processing of the TS → PS conversion means 87. Absent. That is, TS → PS
The order of the conversion processing and the WM detection control can be interchanged. For example, FIG. 15 is a diagram obtained by replacing a part of the signal flow in FIG.

Here, the WM detection control means 85 operates according to the IEEE standard.
The WM detection is performed on the transfer data from the E1394 signal receiving means 89. If the WM detection can be directly detected from the transferred data, the detection is performed from that state. For example, if the WM detection corresponds to either the transport stream or the program stream, the stream is detected. WM in the appropriate part of the conversion
Perform detection. If WM detection is possible at an intermediate level of those streams, WM detection is performed using a signal of an appropriate level for detection. of course,
The stream may be once converted, and after detecting the WM, the stream may be converted again to the original trim. Also, TS → PS
If conversion is not required, WM is detected without conversion,
It is also possible to output.

Also, while the reproduced data is a bit stream by MPEG compression, if the WM detection corresponds to the detection from the baseband state, the bit stream is temporarily converted to the baseband to detect the WM. After that, it is converted back to the original state. here,
The level to be converted need not be completely converted to the baseband, but may be converted to a stage where WM detection is possible.

As described above, by adopting a configuration for converting the data state to a level at which the WM can be detected, it is possible to prevent an extra circuit from increasing. Here, M
We described PEG compression and transfer stream conversion.
If it is necessary to detect M, it is possible to perform WM detection optimally by performing conversion or a part of conversion in accordance with the WM detection method, and performing reverse conversion to the original state after WM detection. Become. This conversion can also be applied when WM needs to be rewritten or added.

As described above, the data conversion and the encryption / decryption / encoding are not limited to this order because the processing order can be changed in addition to the order shown here. Although the transfer stream conversion has been described here, if necessary for WM detection, conversion or a part of conversion according to the WM detection method is performed, and WM detection is performed.
By inversely converting to the original state after detection, optimal W
M detection can be performed. Also, this conversion is WM
It can be adapted even when rewriting or addition is necessary.

FIG. 9 shows the structure of the DVD video / audio encoder 74 in FIG. In the figure, 91 is an AD converter, 92 is an MPEG encoder, 93 is WM detection control means, 94 is an M6 encryption encoder, and 95 is an encryption 2 encoder.

An analog signal such as a video signal and an audio signal is digitized by the AD converter 91. Although not shown here, in the case of a video signal,
A copy protection signal called a macro vision signal is added, and when this signal is detected, control is performed to prohibit copying.

Next, the digitized data is stored in the MPE
It is compressed by a compression method such as G.

At the same time, the WM detection control means 93
Is detected, and when WM is detected, control is performed according to WM. If the WM is not detected or is a WM indicating that the data has no right, it is not necessary to encrypt the data to be recorded. Therefore, after MPEG encoding, the data is sent to the DVD error correction code adding means 75 as it is. .

As a result of the WM detection, if the data is not the data copied illegally but the data permitted to be recorded on the recording medium, predetermined encryption is performed by the M6 encryption encoder 94 or the encryption 2 encoder 95. It is sent to the DVD error correction code adding means 75. In the WM detection, when the copy control information needs to be updated for recording on the disc,
After updating the WM, encryption is performed. Here, encryption 2
May use the same encryption as the M6 encryption or the M1 encryption. By using the same cipher, the decryption circuit for the cipher can be shared, so that the circuit can be simplified.

As described above, the IEEE1 shown in FIGS.
The output from the 394 I / F 72 and the DVD video / audio encoder 74 is received, and the DVD error correction code adding means 75 in FIG. 7 adds a code for error correction and converts the output to a format that can be recorded on the DVD disk 76. I do. Microcomputer 77
Performs system control for recording and reproduction, controls the servo means 78, and controls rotation and access of the DVD disk. Further, key information is exchanged in the CG processing shown in FIG.

At the time of reproduction, as in the case of recording, there are a digital output system and an analog output system. The operation for each output will be described with reference to FIGS.

FIG. 10 is a diagram showing the IEEE 1394 in FIG.
2 shows a configuration of the I / F 70. In the figure,
Reference numeral 101 denotes CG processing means for performing copy control in accordance with a CG (Contents Guard) method, 102 denotes DTCP means for performing copy control in accordance with a method adopted in DTCP, and 103 denotes M6.
The cipher decoding means 104 is a CSS (Contents Scram
ble System), 105 is a decoding means for cipher 1, 106 is a decoding means for cipher 2, 107 is WM
WM detection control means for detecting
08 is a PS → TS converter for converting a program stream into a transport stream, 109 is an M6 encryption encoder, and 110 is an IEEE 1394 signal receiving unit.

The data reproduced from the DVD disk is
The signal is demodulated and error-corrected by the DVD error correction means 79 and sent to a digital output system and an analog output system.

The CG processing means 101 updates the key information included in the data, and uses the new key information as the recording information in the DT.
Send to CP means 102. The DTCP means 102 performs mutual authentication and exchange of key information for decrypting encryption between devices performing data transfer. Here, the transfer data having a right such as a copyright is transferred by encrypting the data so that even if the data is taken out during transfer, it cannot be read correctly.

Those without the right are transferred as clear signals without encryption.

If the data after error correction is encrypted, it is decoded according to the encrypted method.
The data on the DVD-ROM disc is CSS-encrypted, and a decoder (decoding means 104) corresponding to this is required. At the time of recording, M6 encryption, encryption 1 and encryption 2
Since there are some kinds of ciphers, the corresponding three kinds of decoders (decoding means 103, 105 and 106) are described. However, if these are recorded using the same cipher, the decoder Can be combined. Each decoder decodes up to WM-detectable data, detects WM by WM detection control means 107, and controls the output according to the detection result.

As a result of the WM detection, if the data is not illegally recorded data but data transfer permitted, the stream is converted by the PS → TS conversion means 108 for converting the program stream into a transport stream. After the conversion, the data is encrypted by the M6 encryption encoder 109 and sent to the IEEE 1394 signal receiving unit 110.

Further, WM detection is also performed on unencrypted data since there is a possibility that the data has been illegally copied. If WM is detected here,
It is controlled according to the WM, and the PS → TS conversion means 108
To convert the stream, and then use M6
The data is encrypted and sent to the IEEE 1394 signal receiving means 110.

In the WM detection, when the copy control information needs to be updated, the WM is updated and then the encryption is performed. If the WM has already been updated at the time of recording and it is not necessary at the time of reproduction, the WM is not updated.

In this case, as in the case described above with reference to FIG. 4, the order of the PS → TS conversion processing and the WM detection control can be interchanged. As shown in FIG. It is possible to replace them.

As described above, if necessary for the WM detection, conversion or a part of the conversion is performed according to the WM detection method, and the WM is detected and converted back to the original state, so that the WM is optimally detected. Detection can be performed. This conversion can also be applied when WM needs to be rewritten or added.

FIG. 11 shows the structure of the DVD video / audio decoder 81 in FIG. In the figure, 111 is an M6 cipher decoding means, 112 is a CSS decoding means, 113 is a cipher 1 decoding means, 114 is a cipher 2 decoding means, and 115 is an MPEG
A decoder 116 is a WM detection control means, and 117 is a DA converter.

The data reproduced from the DVD disk is
The signal is demodulated and error-corrected by the DVD error correction means 79 and sent to a digital output system and an analog output system.

If the error-corrected data is encrypted, it is decoded in accordance with the encrypted method.
The data on the DVD-ROM disc is CSS-encrypted, and a decoder (decoding means 112) corresponding to the CSS is required. At the time of recording, M6 encryption, encryption 1 and encryption 2
Since there are different kinds of ciphers, the corresponding three kinds of decoders (decoding means 111, 113, 114) are described. However, if these are recorded using the same cipher, the decoder Can be combined. It is decoded by each decoder, and is decoded by the MPEG decoder 115 into a video signal and an audio signal.

Here, the WM detection control means 116
M is detected, and the output is controlled according to the detection result.
As a result of the WM detection, if the data is not illegally recorded data but data output is permitted, the data is output from the analog output terminal 73 via the DA converter 117. For unencrypted data,
Since there is a possibility that the data has been illegally copied, WM detection is performed. Here, when WM is detected, control is performed according to WM.

In the WM detection, if the copy control information needs to be updated, the WM is updated and then the encryption is performed. If the WM has already been updated at the time of recording and it is not necessary at the time of reproduction, the WM is not updated.

Although not shown here, in the case of a video signal, a copy protection signal called a macro vision signal is usually added, so that the analog output digitalized by the DA Control is performed by adding a vision signal to prohibit copying.

As described above, in a recording / reproducing apparatus having a digital input / output terminal and an analog input / output terminal, by providing appropriate decryption means and WM detection control means in accordance with encryption applied to data, digital data and Appropriate copy control can be performed for both analog data. In the two embodiments described above,
Although the device is shown as having both a digital input / output terminal and an analog input / output terminal, a combination of each of them may be used alone.

Here, in the description of FIGS. 8, 9, 10 and 11, the WM detection control means is shown independently for easy understanding, but the WM detection control means 8 is provided on the recording system side.
5 and the WM detection control means 93 can be shared, and the WM detection control means 107 and the WM detection control means 116 can be shared on the reproduction system side.

FIG. 12 shows another example of a DVD video / audio decoder, and this example is an example of application to a video / audio board connected to a PC.

In FIG. 12, reference numeral 118 denotes a digital input terminal, 119 denotes an analog output terminal, 120 denotes a PC video / audio board, 121 denotes a PC internal bus interface, 122 denotes authentication means for performing authentication and key information transfer, 123 is a decoding means of the M6 cipher, 124
Is CSS decoding means, 125 is cipher 1 decoding means, 126 is cipher 2 decoding means, 127 is MPEG
A decoder, 128 is a WM detection control means, and 129 is a DA converter.

Digital data reproduced by a DVD drive or the like is sent to an MPEG video / audio board connected to a PC, a video signal is output to a monitor, and an audio signal is output from a speaker.

Interface 121 of PC internal bus
Is, for example, a bus for connecting boards inside a PC, such as PCI, or a data transfer interface for connection with an external device, such as SCSI, ATAPI, or USB.

To perform data transfer, the authentication means 12
2 to confirm the other party to be connected and transfer key information. If the transferred digital data is encrypted, decoding is performed according to the encrypted method. The data on the DVD-ROM disc is CSS-encrypted, and a decoder (decoding means 124) corresponding to the CSS is required. In order to record on a DVD disk, three types of M6 encryption and encryption 1 and encryption 2 are conceivable. Therefore, three corresponding decoders (decoding means 123, 125, 126) are described. Here, the three types of decoders are separately illustrated, but if these are recorded using the same encryption method, the decoders can be used correspondingly. It is decoded by each decoder, and is decoded by the MPEG decoder 127 into a video signal and an audio signal.

Here, the WM detection control means 128
M is detected, and the output is controlled according to the detection result.
As a result of the WM detection, if the data is not illegally recorded data but data for which analog output of data is permitted, the analog output terminal 1 is output via the DA converter 129.
Output from 19.

Further, WM detection is also performed on unencrypted data since there is a possibility that the data has been illegally copied. If WM is detected here,
It is controlled according to WM. When the copy control information needs to be updated in the WM detection, the WM is updated and then encryption is performed. If the WM has already been updated at the time of recording and it is not necessary at the time of reproduction, the WM is not updated.

Although not shown here, in the case of a video signal, a copy protection signal called a macro vision signal is usually added, so that the analog output digitized by the D / A converter Control is performed by adding a vision signal to prohibit copying.

FIG. 13 shows an example of the configuration of an STB (Set Top Box) provided with an IEEE 1394 I / F.

In FIG. 13, 130 is an STB, 131
, A digital input terminal; 132, an IEEE 1394 signal receiving means; 133, a DTCP means for performing copy control in accordance with a method adopted in DTCP; 134, a CG processing means for performing copy control in accordance with a CG method; Decoding means, 136 is an MPEG decoder, 137 is WM
WM detection control means for detecting
38 is a DA converter, and 139 is an analog output terminal.

The STB 130 receives digital data from a DVD recording / reproducing apparatus as shown in FIG. 1, for example, via IEEE1394. The transfer data received by the IEEE 1394 signal receiving means 132 is used by the DTCP means 133 to perform mutual authentication between devices performing data transfer and to pass key information for decrypting the data, and the CG processing means 134 The key information is updated, and new key information is recorded as recording information.

Here, data having a copyright, such as a copyright, in the transfer data is encrypted so that the data cannot be read out in the middle of the transfer.
E1394 employs M6 encryption. Those without the right are transmitted as clear signals without encryption.

Therefore, the data that has undergone M6 encryption is M
Decode 6 codes so that they can be decoded as video and audio signals. The MPEG decoder 136 decodes the decoded data into a video signal and an audio signal.

Here, the WM detection control means 137 outputs W
M is detected, and the output is controlled according to the detection result.
As a result of the WM detection, if the data is not illegally recorded data but data whose output is permitted, the data is output from the analog output terminal 139 via the DA converter 138. WM detection is also performed on unencrypted data since there is a possibility that the data has been illegally copied. If WM is detected here, W
M.

In the WM detection, if the copy control information needs to be updated, the WM is updated and then encryption is performed. If the update of the WM has already been performed and it is not necessary at the time of reproduction, the update is not performed.

Although not shown here, in the case of a video signal, a copy protection signal called a macro vision signal is usually added, so that the analog output digitized by the DA converter 138 is also macro Control is performed by adding a vision signal to prohibit copying.

FIGS. 12 and 13 show an example of a device having digital inputs and analog outputs. However, the combination of inputs and outputs is not limited to these, and a plurality of inputs and outputs may be provided. Is also possible.

As described above, in a recording / reproducing apparatus having a digital input / output terminal and an analog input / output terminal, by providing appropriate decryption means and WM detection control means in response to encryption applied to data, digital data and Appropriate copy control can be performed for both analog data.

[0110]

As described above, according to the present invention, in a bit stream recording / reproducing apparatus or an RTRW recording / reproducing apparatus having digital input / output and analog input / output, appropriate WM detection control means and encryption / decoding of encryption Is provided, it is possible to prevent illegal recording or reproduction of copyrighted data.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a recording / reproducing apparatus for recording / reproducing data including copy control information according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration example of an IEEE 1394 I / F 12 of FIG.

FIG. 3 is a DVD video / audio encoder 1 of FIG.
4 is a block diagram illustrating a configuration example of FIG.

FIG. 4 is a block diagram showing a configuration example of an IEEE 1394 I / F 20 of FIG. 1;

FIG. 5 is an explanatory diagram showing the difference between the configurations of two types of streams in the MPEG-2 system.

6 is a DVD video / audio encoder 2 of FIG.
1 is a block diagram illustrating a configuration example of FIG.

FIG. 7 is a block diagram showing a configuration of a recording / reproducing apparatus for recording / reproducing data including copy control information according to another embodiment of the present invention.

8 is a block diagram illustrating a configuration example of an IEEE 1394 I / F 72 of FIG. 7;

FIG. 9 shows the DVD video / audio encoder 7 of FIG.
4 is a block diagram illustrating a configuration example of FIG.

FIG. 10 is an explanatory diagram showing a configuration example of an IEEE 1394 I / F 80 of FIG. 7;

11 is a block diagram illustrating a configuration example of a DVD video / audio encoder 81 in FIG. 7;

FIG. 12 is a block diagram showing a configuration example of a DVD-Video / Audio decoder of a reproduction output system according to still another embodiment of the present invention.

FIG. 13 shows an IEEE according to still another embodiment of the present invention.
It is a block diagram showing an example of the composition of STB provided with E1394I / F.

14 is a block diagram showing another example of the configuration of the IEEE 1394 I / F 20 of FIG. 4 or the IEEE 1394 I / F 70 of FIG.

FIG. 15 is a block diagram showing another configuration example of the IEEE 1394 I / F 72 of FIG. 8;

[Explanation of symbols]

DVD-RAM capable of recording and reproducing 10 bit stream
Drive 11 Digital input terminal 12 IEEE1394 I / F 13 Analog input terminal 14 DVD video / audio encoder 15 DVD error correction code adding means 16 DVD disk 17 Microcomputer 18 Servo means 19 DVD error correction means 20 IEEE1394 I / F 21 DVD video / audio decoder 22 Digital output terminal 23 Analog output terminal

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H04N 1/387 H04N 1/387 5J104 5/91 5/91 P 9A001 5/92 5/92 H (72) Inventor Keiji Noguchi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture F-term (reference) 5D017 AA06 BA07 BB09 CA09 CA15 5B057 AA11 BA04 CA12 CA16 CB12 CB16 CE08 CH11 DA08 DB02 5C053 FA25 GA10 GA11 GB05 GB38 HA33 JA16 KA04 KA25 LA11 5C076 AA14 BA06 5D044 AB01 AB05 AB07 BC06 CC04 DE50 EF01 EF05 FG14 FG18 GK07 GK17 GK20 HL02 HL08 5J104 AA14 JA31 NA02 PA14 9A001 BB02 BB03 BB04 KK03 EE03 EE03

Claims (20)

[Claims] 1. An input terminal for inputting digital data, an interface means for receiving the transferred digital data, a recording processing means for performing a recording process for recording the transferred digital data on a recording medium,
A data recording device comprising: recording means for recording data on a recording medium; wherein the interface means, when the digital data is encrypted, decryption means for decrypting the encryption; 1. A data recording apparatus comprising: first detection means for detecting digital watermark information from a digital watermark; and first encryption means for encrypting the digital data. 2. The compression means according to claim 1, further comprising: an input terminal for inputting an analog signal; AD conversion means for converting the analog signal into a digital signal; and compression means for compressing the converted digital signal. A second aspect of the present invention is a data recording apparatus comprising: a second detection unit that detects digital watermark information; and a second encryption unit that encrypts compressed data. 3. An input terminal for inputting an analog signal, AD conversion means for converting an analog signal into a digital signal, compression means for compressing the converted digital signal, and recording the compressed digital signal on a recording medium. A data recording apparatus comprising: a recording processing unit for performing a recording process for performing a recording process; and a recording unit for recording data on a recording medium. The compression unit comprises: a second detection unit for detecting digital watermark information; And a second encrypting means for encrypting the encrypted data. 4. An apparatus according to claim 3, further comprising: an input terminal for inputting digital data; and interface means for receiving the transferred digital data, wherein said interface means is provided when said digital data is encrypted. , Decryption means for decrypting the encryption, first detection means for detecting digital watermark information from the decrypted digital data, and first encryption means for encrypting the digital data. Data recording device. 5. The method according to claim 4, wherein when the same encryption is performed by the first encryption unit and the second encryption unit, the first encryption unit and the second encryption unit are shared. A data recording device. 6. A reproducing means for reproducing data from a recording medium, a reproducing processing means for reproducing data read from the recording medium, an interface means for transmitting digital data after the reproducing processing, and outputting the digital data. An output terminal, wherein the interface means comprises: first decryption means for decrypting the encrypted digital data when the digital data after the reproduction processing is encrypted; and decrypted digital data. 1. A data reproducing apparatus comprising: first detection means for detecting digital watermark information from a digital watermark; and first encryption means for encrypting the digital data. 7. The reproduction processing device according to claim 6, further comprising: expansion means for expanding the reproduced data; DA conversion means for converting a digital signal into an analog signal; and an output terminal for outputting an analog signal. When the digital data before processing is encrypted, the digital data includes second decryption means for decrypting the encryption, and the decompression means includes second detection means for detecting digital watermark information. A data reproducing device characterized by the above-mentioned. 8. A reproduction means for reproducing data from a recording medium, a reproduction processing means for reproducing data read from the recording medium, a decompression means for decompressing the reproduced data, and a digital signal converted to an analog signal. In a data reproducing apparatus having a DA converting means for converting and an output terminal for outputting an analog signal, when digital data after the reproducing process is encrypted, the second decrypting means for decrypting the digital data is used. A data reproducing apparatus, wherein the decompression means includes second detection means for detecting digital watermark information. 9. An apparatus according to claim 8, further comprising: interface means for transmitting digital data after reproduction processing; and an output terminal for outputting digital data, wherein said interface means comprises: When the digital data is encrypted, first decryption means for decrypting the encryption, first detection means for detecting digital watermark information from the decrypted digital data, and second decryption means for encrypting the digital data A data reproducing apparatus, comprising: a first encryption unit. 10. The method according to claim 7, wherein when the same decoding is performed by the first decoding unit and the second decoding unit, the first decoding unit and the second decoding unit are shared. A data reproducing apparatus characterized in that: 11. A data recording method for inputting data and recording the data, wherein when the input data is encrypted, the encryption is once decrypted and the additional data included in the input data is decrypted. A data recording method comprising: detecting information; controlling the recording of the input data in accordance with a result of the detection; and encrypting the input data again by a predetermined method to obtain recorded data. 12. The data recording method according to claim 11, wherein the input data is decoded to a data format in which the additional information can be detected. 13. The method according to claim 11, wherein when the input data is not encrypted, additional information included in the input data is detected, and recording of the input data is controlled in accordance with the detection result. A data recording method wherein the input data is encrypted again by a predetermined method to obtain recording data, if necessary. 14. The data processing system according to claim 11, wherein the input data is configured in a data string format for transfer, and when recording data is recorded in a different data string format, the decryption is performed and the encryption is performed again. A data recording method characterized in that a data string format is converted during the period. 15. A data reproducing method for reproducing data from a recording medium and outputting reproduced data, wherein if the reproduced data is encrypted, the code is decrypted once and included in the reproduced data. Data output method, wherein the output of the reproduced data is controlled in accordance with a result of the detection, and the reproduced data is again encrypted by a predetermined method so as to be output data. . 16. The data reproducing method according to claim 15, wherein the decoding of the reproduced data is performed up to a data format in which the additional information can be detected. 17. The reproduction data according to claim 15, wherein when the reproduction data is not encrypted, additional information included in the reproduction data is detected, and the output of the reproduction data is controlled according to the detection result. And, if necessary, encrypting the reproduced data again by a predetermined method to obtain output data. 18. The apparatus according to claim 15, wherein the input data is configured in a data string format for recording on a recording medium, and when the output data is output in a different data string format, the decoding is performed, and the decoding is performed again. A data reproducing method, wherein data format conversion is performed before encryption is performed. 19. The data recording apparatus according to claim 4, wherein said first detection means and said second detection means are used in combination. 20. The data reproducing apparatus according to claim 9, wherein said first detecting means and said second detecting means are combined.