JPH113567A - Signal processing method and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily judge whether or not data are subjected to scrambling and whether or not data is already scrambled. SOLUTION: This device has a data input detecting block 21 and the leading part subtracting block 22 taking out a pattern for detection added to compressed AV(audio video) data and scrambled/non-scrambled with compressed AV data, a data value comparing block 24 comparing a pattern for comparison for discriminating existence of scramble of a pattern for detection with the taken out pattern for detection, a scramble/non-scramble discriminating block 25 judging necessity/unnecessity of scramble of compressed AV data based on the compared result, and a scramble/non-scramble signal processing block 27 scrambling/non-scrambling the compressed AV data based on the discriminated result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal processing method for reproducing data signals recorded on a recording medium, and performing signal processing on the data to prevent the data signals from being illegally copied and reused. Related to the device.

[0002]

2. Description of the Related Art Data (contents) recorded on package media such as optical disks, floppy disks, and recent digital video disks (DVDs) are liable to be illegally reproduced and copied and reused. For the purpose of preventing re-use, important data is scrambled and encrypted, and the scrambled data is recorded on a disk. That is, for example, data is scrambled by a key signal or the like and encrypted before being recorded on a disk, so that the data cannot be reused by simply reproducing and copying the scrambled data as it is. Like that.

[0003]

Here, in the system for recording data on a disk as described above, in which part the data is actually scrambled varies depending on the system. That is, in this system, data can be scrambled freely within a range according to the format.

As described above, since the scrambled portion has a degree of freedom, the final processing section of the system determines whether the data (content) has already been scrambled or has not been scrambled yet. It is difficult to make an unambiguous determination. For example, even if an encryption flag added to data is detected, it is not known whether the data is actually scrambled.

[0005] For this reason, conventionally, for the purpose of knowing whether or not data is actually scrambled,
It is necessary to actually record the data on a disk and reproduce the disk.

[0006] Such a problem is very complicated, causes a reduction in efficiency during disk manufacturing, and is extremely undesirable for stabilizing disk manufacturing. Therefore, at the time of manufacturing a package medium (disk), whether data should be scrambled in, for example, the final processing unit of the system, that is,
It is desirable to be able to easily determine whether the data has already been scrambled.

Accordingly, the present invention has been made in view of such a situation, and it is possible to easily determine whether or not data should be scrambled and whether or not the data has already been scrambled. It is an object of the present invention to provide a signal processing method and apparatus for realizing accurate scrambling processing.

[0008]

SUMMARY OF THE INVENTION A signal processing method and apparatus according to the present invention extracts a predetermined pattern signal to be encrypted / unencrypted together with data and determines whether or not the predetermined pattern signal is encrypted. Compare with the determination pattern signal, determine the necessity of data encryption based on the comparison result,
The above-described problem is solved by encrypting / decrypting the data based on the determination result.

That is, according to the present invention, whether or not data is encrypted is determined only by a simple pattern comparison between a predetermined pattern and a determination pattern.

[0010]

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

In the embodiment of the present invention, data is scrambled and encrypted (that is, the encrypted data is encrypted) in order to prevent the illegal copying described above on a package medium such as a digital video disk. Recorded on a disc).

First, as an example of a system for performing scrambling, a system for encrypting digital content data such as audio / video data (AV data) by scrambling (CSS: Content Scramble)
System) will be described with reference to FIG.

The system shown in FIG. 1 includes a copyright holder 1 who owns digital content data (audio / video data) to be recorded on a package medium such as the digital video disc, and a copyright holder 1 of the copyright holder 1. Various signal processing for digital content data,
For example, an authoring studio 3 that performs editing processing and compression and multiplexing of the edited data (so-called complete packet data), and an agent 2 that manages various encryption-related signals (for example, a scramble key signal and a signal related thereto). And performs predetermined signal processing such as addition of an error correction code on the data after compression and multiplexing (hereinafter referred to as compressed AV data), further modulates the signal into a signal for disk recording, and converts the modulated signal. And a disk factory 4 for cutting a disk using the disk factory.

In this system, even if the data recorded on the disc is illegally reproduced and copied, the data cannot be reused (that is, a disc with a copy guard is created). The digital content data is scrambled for encryption using the key signal.

Here, in this system, as shown in FIG. 2, the signal converters (formatters) of the authoring studio 3 and the disk factory 4 both use:
The CSS scramble process using the key signal of the encryption-related signal can be performed. In addition,
2, the same components as those in FIG. 1 are denoted by the same reference numerals.

In FIG. 2, various encryption-related signals (key signals and the like) managed by the agent 2 are transmitted to a formatter unit 10 (signal conversion unit) of a disk factory by various forms such as a floppy disk, a keyboard, and communication. ) And the above-mentioned Osan Ring Studio 3.

Here, for example, if the scramble processing using the key signal is performed in the authoring studio 3, the scrambled data (scrambled compressed AV data) is transferred to the disk factory 4. At this time, the disc factory 4 does not re-scramble the already scrambled compressed AV data.
Generate cutting data.

On the other hand, if the scramble processing is not performed in the authoring studio 3, for example, the compressed AV data that has not been scrambled is supplied to the disk factory 4, and the disk factory 4
Then, the data is subjected to scramble processing as required, and then cutting data is generated.

In order to realize this, the formatter unit 10 of the disk factory 4 determines whether or not the compressed AV data supplied from the authoring studio 3 has already been scrambled, and determines whether or not the compressed AV data has been scrambled. The scramble processing using the key signal is performed on the uncompressed compressed AV data. Conversely, on the scrambled compressed AV data, the scrambled compressed AV data is directly transferred to the next stage. A scramble / non-scramble processing unit 11 for outputting is provided.

The output signal of this scramble / non-scramble processing section 11 is an encrypted key signal insertion section 12
Sent to The encrypted key signal insertion unit 12 inserts data (an encrypted key signal or the like) obtained by encrypting the encryption-related signal from the agent 2 into the compressed AV data scrambled as described above. Then, the data is sent to the formatter signal processing unit 13.

The formatter signal processing section 13 performs predetermined signal processing such as addition of an erroneous correction code on the input data, modulates the data into a signal for disk recording, and discriminates the modulated signal into a disk cutting signal. Output as a signal. This disc cutting signal is sent to a disc cutting unit (not shown).

Here, the formatter section 10 of the disc factory is required to be able to uniquely determine whether or not the compressed AV data supplied from the authoring studio 3 has already been scrambled, as shown in FIG.
As shown in the figure, at the beginning of the original compressed AV data,
For example, SMPTE (Society of Motion Picture and Tel
A pattern signal for encryption detection (hereinafter referred to as a detection pattern) consisting of a known test pattern that does not exist in the data, such as a color bar signal of evision Enginieers (a digital standard for composite signals), and this detection pattern And a synchronization pattern for finding. Although not shown in FIG. 3, a lead-in section, a header section, a control section, and the like are added to the original compressed AV data after the detection pattern by a conventional process. .

The above detection pattern is composed of the original compressed A
Since it is not V data (data actually cut on the disc), it is inserted before the original compressed AV data so that it can be easily distinguished and separated from them.
Also, in this case, the position of the detection pattern is determined so that the position of the detection pattern can be reliably found and the necessity of scrambling (scramble / non-scramble processing) using the detection pattern can be accurately determined. A synchronization pattern is added to the head.

As shown in FIG. 3, the detection pattern is, for example, one as shown in FIG. 3 so as not to be erroneously detected when determining whether or not scrambling is necessary (scramble / non-scramble processing).
A sufficient length such as 0 sectors is added. In addition, as the above-mentioned synchronization pattern, for example, a pattern which is not normally generated, in which five sectors are alternately arranged with sectors consisting of all "1" and sectors consisting of all "0", is used.

Here, for example, when the compressed AV data is scrambled in the authoring studio 3, the synchronization pattern, the lead-in section, the header section, the control section, etc., of the data string shown in FIG. Except for this, only the detection pattern and the compressed AV data are scrambled. Therefore, when the compressed AV data is not scrambled in the authoring studio 3, the detection pattern is not scrambled.

When the formatter unit 10 actually detects the detection pattern, it first detects a synchronization pattern from the input data, synchronizes based on the synchronization pattern, and prepares it internally in advance. The comparison pattern for determining the presence / absence of scrambling of the detection pattern is compared with the detection pattern, and the state of the encryption flag added to the data is determined. Is determined based on the comparison result of (i) and the state determination result of the encryption flag (scrambling / non-scramble processing). Note that the encryption flag is generally set to "1" when data is scrambled.

Thereafter, the formatter unit 10 removes the synchronization pattern and the detection pattern from the input data to which the synchronization pattern and the detection pattern are added, and removes the remaining data, ie, the compressed AV data (lead-in unit and header). , And the control unit, etc.) are scrambled or not, based on the comparison result and the state determination result of the encryption flag. That is,
When it is determined from the comparison result of the pattern and the result of the flag state determination that the data requires encryption and has not yet been scrambled, the disk signal is generated after performing the scramble processing using the key signal. Conversely, if it is determined that the data requires encryption and has already been scrambled, a disc cutting signal is generated as it is from the scrambled data. Note that the lead-in section, header section, and control section are not scrambled according to the format.

The necessity determination of scrambling based on the above-described pattern comparison result and the encryption flag state determination result is performed, for example, according to the flow shown in FIGS.

FIG. 4 shows the flow from the determination of the necessity of the scrambling when the comparison pattern is the same as the unscrambled detection pattern to the subsequent generation of the disc cutting signal.

In FIG. 4, in step ST1,
It is determined whether or not the detection pattern of the input data matches the comparison pattern. If they match, the process proceeds to step ST2, and if they do not match, the process proceeds to step ST4. Here, that the detection pattern matches the comparison pattern means that the detection pattern is not scrambled, that is, that the compressed AV data is not scrambled. The fact that the comparison pattern does not match the comparison pattern means that the detection pattern is scrambled, that is, the compressed AV data is also scrambled.

In step ST2, where the detection pattern matches the comparison pattern in step ST1, that is, when the compressed AV data has not yet been scrambled, the encryption flag is set to "1". It is determined whether or not “1” stands, and the process proceeds to step ST3. If “1” does not stand, the process proceeds to step ST6.

In step ST3, since the encryption flag is set to "1", the compressed AV data not yet scrambled is scrambled.
Thereafter, the process proceeds to step ST6.

In step ST6, which proceeds after the processing in step ST3, the synchronization pattern and the detection pattern are removed from the input data to which the synchronization pattern and the detection pattern are added, and the remaining data, that is, the lead-in portion and the header portion are removed. A disc cutting signal is generated from the scrambled compressed AV data to which a control unit and the like are added.

On the other hand, when the encryption flag is not set to "1" in step ST2, the process proceeds to step S2.
At T6, the synchronization pattern and the detection pattern are removed from the input data to which the synchronization pattern and the detection pattern are added, and the remaining data, that is, the lead-in section, the header section, the control section, and the like are added and scrambled. A disc cutting signal is generated from the uncompressed AV data.

Also, in step ST4 when the detection pattern does not match the comparison pattern in step ST1, that is, when the compressed AV data is already scrambled, "1" is set in the encryption flag. It is determined whether or not it is standing. If "1" is standing, the process proceeds to step ST6, and if "1" is not standing, the process proceeds to step ST5.

If it is determined in step ST4 that the encryption flag is "1", the scrambled compressed AV data is not re-scrambled. The synchronization pattern and the detection pattern are removed from the input data to which the synchronization pattern and the detection pattern are added, and the remaining data, that is, the compressed data to which the lead-in section, the header section, the control section, and the like are added and which are already scrambled. A disc cutting signal is generated from the AV data.

On the other hand, when it is determined in step ST4 that "1" is not set in the encryption flag, that is, even though the compressed AV data has already been scrambled, the encryption flag is set to "1". Does not stand, it is determined that the input data is erroneous, and a display device (not shown) or the like is displayed to that effect to inform the operator of the system, and further data processing is stopped.

Next, FIG. 5 shows the comparison pattern,
The flow from the necessity determination of the above-described scrambling when the detection pattern is the same as the detection pattern scrambled using the key signal, and the subsequent flow up to the generation of the disc cutting signal are shown.

In FIG. 5, in step ST11, it is determined whether or not the detection pattern of the input data matches the comparison pattern. If the pattern matches, the process proceeds to step ST12, and if not, the process proceeds to step ST1.
Proceed to 4. Here, the fact that the detection pattern matches the comparison pattern means that the detection pattern is scrambled, that is, the compressed AV data is also scrambled. The fact that the comparison pattern does not match the comparison pattern means that the detection pattern is not scrambled, that is, the compressed AV data is not scrambled.

When the detection pattern matches the comparison pattern in step ST11, that is, when the compressed AV
In step ST12, which proceeds when the data is already scrambled, it is determined whether or not "1" is set in the encryption flag. If "1" is set, the process proceeds to step ST16, where "1" is set. If not, the process proceeds to step ST13.

If it is determined in step ST12 that the encryption flag is set to "1", the scrambled compressed AV data is not re-scrambled, and in step ST16, The synchronization pattern and the detection pattern are removed from the input data to which the synchronization pattern and the detection pattern are added, and the remaining data, that is, the compressed data to which the lead-in section, the header section, the control section, and the like are added and which are already scrambled. A disc cutting signal is generated from the AV data.

On the other hand, when it is determined in step ST12 that "1" is not set in the encryption flag, that is, even though the compressed AV data has already been scrambled, "1" is set in the encryption flag. Does not stand, it is determined that the input data is erroneous, and a display device (not shown) or the like is displayed to that effect to inform the operator of the system, and further data processing is stopped.

Also, in step ST14 when the detection pattern does not match the comparison pattern in step ST11, that is, when the compressed AV data is not yet scrambled, "1" is set in the encryption flag. It is determined whether or not it is standing. If “1” is standing, the process proceeds to step ST15, and if “1” is not standing, the process proceeds to step ST16.

In step ST15, since the encryption flag is set to "1", the compressed AV data which has not been scrambled is scrambled, and then the process proceeds to step ST16.

In step ST16, which proceeds after the processing in step ST15, the synchronization pattern and the detection pattern are removed from the input data to which the synchronization pattern and the detection pattern are added, and the remaining data, that is, the lead-in portion and the header portion are removed. A disc cutting signal is generated from the scrambled compressed AV data to which a control unit and the like are added.

On the other hand, in step ST16, which proceeds when the encryption flag is not set to "1" in step ST14, the input data to which the synchronization pattern and the detection pattern are added is used to determine the synchronization pattern. And a detection pattern are removed, and a disc cutting signal is generated from the remaining data, that is, compressed and unscrambled AV data to which a lead-in section, a header section, a control section, and the like are added.

As shown in the example of FIG. 5, if the scrambled comparison pattern is used to make a direct comparison with the scrambled detection pattern, the presence or absence of encryption is more reliably determined. Can be determined.

FIG. 6 shows a specific configuration of the formatter unit in the disk factory. In FIG. 6, the same components as those in FIG. 2 are denoted by the same reference numerals.

In FIG. 6, data from the authoring studio 3 (the data string shown in FIG. 3)
Is input to the data input detection block 21. The data input detection block 21 performs synchronization detection from the input data using the synchronization pattern, and the head extraction block 22 extracts the head of the data in which the detection pattern is arranged. This head extraction block 22
When the detection pattern portion is extracted, the output of the comparison pattern is obtained from the comparison pattern storage block 23 storing the comparison pattern, and the extracted detection pattern is sent to the data value comparison block 24. Supply.

At this time, the data value comparison block 24 compares the data value of the comparison pattern from the comparison pattern storage block 23 with the detection pattern from the head extraction block 22. The comparison result in the data value comparison block 24 is sent to the scramble / non-scramble determination block 25.

In the scramble / non-scramble judgment block 25, the compression A
It is determined whether or not the V data is scrambled, and the determination result is output to the encryption flag check block 26.

In the encryption flag check block 26,
A state determination is made as to whether or not the above-mentioned "1" is set in the encryption flag of the data supplied via the data input detection block 21, and the state determination result of the encryption flag and the scramble A scramble control signal for controlling whether or not scrambling is to be performed as described above is generated based on the / non-scramble determination result and sent to the scramble / non-scramble signal processing block 27.

The encryption-related information is also supplied to the scramble / non-scramble signal processing block 27. In this case, the data supplied through the data input detection block 21 is processed based on the scramble control signal. That is, while performing the processing of applying or not applying the scramble as shown in FIGS. 4 and 5,
Processing such as separation of the synchronization pattern and the detection pattern is performed. It should be noted that the scramble / non-scramble signal processing block 27 in the example of FIG. 6 also includes the function of the encrypted key signal insertion unit 12 of FIG.

The data subjected to signal processing such as scramble / non-scramble in the scramble / non-scramble signal processing block 27 is sent to the formatter signal processing unit 13 similar to the above, and is converted into a disc cutting signal.

As described above, according to the present embodiment,
It is possible to accurately judge how to process the input data afterwards, so that there is no need to make a mistake in the scrambling process at the time of disc production, and it is not necessary to wait until after disc production, which is extremely effective and efficient as a production site And stable disk manufacturing.

[0056]

According to the present invention, a predetermined pattern signal to be encrypted / unencrypted together with data is extracted and compared with a determination pattern signal for determining whether or not the predetermined pattern signal is encrypted. By determining the necessity of data encryption based on the comparison result, it is possible to easily determine whether or not the data should be scrambled and whether or not the data has already been scrambled.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a system according to an embodiment of the present invention.

FIG. 2 is a diagram used to explain the operation of a formatter unit in a disk factory.

FIG. 3 is a diagram illustrating a data string in which a synchronization pattern and a detection pattern are added to a head portion.

FIG. 4 is a flow chart showing a flow of determining whether or not scrambling is necessary when a comparison pattern is the same as an unscrambled detection pattern, and thereafter generating a disc cutting signal.

FIG. 5 is a flowchart showing a flow of determining whether or not scrambling is necessary when a comparison pattern is the same as a scrambled detection pattern and thereafter generating a disc cutting signal.

FIG. 6 is a diagram showing a specific configuration of a formatter unit in a disk factory.

[Explanation of symbols]

1 copyright holder, 2 agents, 3 Aussling studio, 4 disc factory, 10 formatter section, 11 scramble / non-scramble processing section,
12 encrypted key signal insertion unit, 13 formatter unit, 21 data input detection block, 22
Head extraction block, 23 comparison pattern storage block, 24 data value comparison block, 25 scramble / non-scramble determination block, 26 encryption flag check block, 27 scramble / non-scramble signal processing block

Claims (14)

[Claims] 1. A predetermined pattern signal added to data and encrypted / unencrypted together with the data is extracted, and a determination pattern signal for determining whether the predetermined pattern signal is encrypted and the extracted pattern signal are extracted. A signal processing unit that compares the data with a predetermined pattern signal, determines whether or not to encrypt the data based on the comparison result, and encrypts / decrypts the data based on the determination result. Method. 2. The signal processing method according to claim 1, wherein said predetermined pattern signal is extracted in response to detection of a synchronization pattern added prior to said predetermined pattern signal. 3. A state of a flag which is set to 1 when data is encrypted is determined, and necessity of encryption of the data is determined based on a determination result of the flag and the comparison result. The signal processing method according to claim 1, wherein 4. The signal processing method according to claim 1, wherein the determination pattern is the same as the predetermined pattern. 5. The signal processing method according to claim 1, wherein the determination pattern is the same as a pattern obtained by encrypting the predetermined pattern. 6. The signal processing method according to claim 1, wherein the predetermined pattern is a pattern that does not exist in the data. 7. The signal processing method according to claim 1, wherein the predetermined pattern has a fixed length. 8. Extraction means for extracting a predetermined pattern signal added to data and encrypted / decrypted together with the data, a determination pattern signal for determining whether the predetermined pattern signal is encrypted or not. Comparing means for comparing the extracted predetermined pattern signal with the extracted pattern signal; determining means for determining whether or not to encrypt the data based on the comparison result; and encrypting / decrypting the data based on the determination result. A signal processing device comprising: an encryption / decryption unit that performs encryption / decryption. 9. A signal according to claim 8, wherein said extracting means includes an extracting means for extracting the predetermined pattern signal in response to detection of a synchronization pattern added prior to the predetermined pattern signal. Processing equipment. 10. A device for determining the state of a flag which is set to 1 when data is encrypted, wherein the determining means encrypts the data based on the result of the flag determination and the result of the comparison. 9. The signal processing device according to claim 8, wherein it is determined whether or not it is necessary. 11. The signal processing device according to claim 8, wherein the determination pattern is the same pattern as the predetermined pattern. 12. The signal processing apparatus according to claim 8, wherein the determination pattern is the same as a pattern obtained by encrypting the predetermined pattern. 13. The apparatus according to claim 8, wherein the predetermined pattern is a pattern that does not exist in the data.
A signal processing device according to claim 1. 14. The signal processing apparatus according to claim 8, wherein said predetermined pattern has a fixed length.