KR0176131B1 - Method and circuit for processing data encoding when recording or reproducing in the digital video cassette recorder - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

A device for recording and reproducing data in a digital VCR, particularly for recording / reproducing a digital video cassette recorder, in which data can be shared only by a limited user by making it available only to a user who has been previously permitted to record data. Related to data encryption processing method and circuit.

2. The technical problem to be solved by the invention

Provides methods and circuitry for copyright protection and limited use by specific software, ie digital VCR tapes requiring security.

3. Summary of Solution to Invention

When recording / playing back tape data using the SDVCR (Super Digital VCR), the data recorded on the tape is encrypted using the source record position flag of the source control header, and only the specific user This should be available.

4. Important uses of the invention

A recording and reproducing circuit and method for encrypting signals in an SDVCR system.

Description

Data encryption processing method and circuit for recording / playback of digital video cassette recorder

1 is a block diagram of an ATV recorder according to the present invention.

2 is a block diagram of an ATV reproduction system according to the present invention.

3 is a block diagram of an SDVCR playback system according to the present invention.

4 is a data format diagram of a track according to the present invention.

5 is a data layout diagram of a sync block of a track according to the present invention.

6 is a data track format to be recorded according to the present invention.

7 is a source control head format according to the present invention.

8 is a maker code header table in accordance with the present invention.

The present invention relates to an apparatus for recording and reproducing data in a digital VCR. In particular, the present invention relates to a digital video cassette recorder capable of sharing data only to a limited user by making the tape recorded data available only to a user who is authorized in advance. The present invention relates to a data encryption processing method and circuit in recording / reproducing.

Recently, as digital VCRs are widely used in film and video production as well as data storage media, the need for copyright protection is increasing day by day. Currently, the restriction on the use of analog VCR is to prevent the operation of the VCR device itself. In other words, the VCR can be operated only when the password is matched by entering the password inside the microcomputer.

Conventionally, the VCR device itself is not operated by installing a locking device on the VCR device itself, but there is no useful value in terms of copyright protection. In addition, since the VCR device does not operate in a batch, it is inconvenient to enter a password when watching a general movie or software.

It is, therefore, an object of the present invention to provide a method and circuit for copyright protection and limited use of a particular software, ie a digital VCR tape requiring security.

The present invention for achieving the above object in the recording / playback of tape data using the SDVCR (Super Digital VCR) using the source recording position flag of the source control head (Sorurce Control Header) recorded data and data recorded on the tape Encrypt it so that only certain users can use it.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is an ATV recording block diagram according to the present invention, in which an ATV transformer layer buffer 101 is temporarily stored to receive an ATV signal and record a bit stream, and is to be recorded from an output of the ATV transformer layer buffer 101. A source recording position check unit 102 for determining whether to encrypt data; ID insertion unit 104 for receiving and inserting a password (ID) when encryption is required for the data value determined from the source recording position check unit 102, and encrypting the user at the output of the ID insertion unit 104. SDVCR shuffling section 108 for changing the data recording order to the time axis direction so as to easily correct burst errors with respect to data desired, and data that do not need to be encrypted at the output of the ID insertion section 104 or the SDVCR shuffling section ( A synchronous block formatting unit 108 for receiving the data shuffled at 105) and formatting the ATV signal according to the synchronous block according to the SDVCR recording format, and recording the output of the synchronous block formatting unit 108 on the ADVCR tape. It consists of a recording processing unit 110.

2 is an ATV reproducing block diagram according to the present invention, wherein the reproducing processor 112 reads the ATV signal recorded on the SDVCR tape, and the data formatted according to the SDVCR format of the output of the reproducing processor 112 is pure ATV. In order to generate a signal, a sync block deformatting unit 114 that controls sync and ID, and a system control peck head are checked from the output of the sync block deformatting unit 114 to check the state of data recorded on the currently playing tape. A source write position check unit 116 for checking, an ID check unit 118 for checking whether or not a password matches the flag checked by the source record position check unit 116, and the encrypted data back to the original position A decoded SDVCR reverse shuffler 120 and an ATV decoder 122 for decoding the ATV signal passed through the ID checker 118 and the SDVCR reverse shuffler 120.

3 is an SDVCR playback block diagram according to the present invention, which includes a playback processing unit 302 which reads and reproduces a signal recorded on a tape, and encrypts by reading a source control head by checking a source recording position of the playback processing unit 302. A source recording position check unit 304 for searching whether a mode is present, a shuffling unit 306 for shuffling to decode from input data that has passed through the source recording position check unit 304, and a shuffling unit in the shuffling unit 306 An inverse DCT section 308 for upsampling the ringed data to expand the data, an ID check section 316 for checking the presence or absence of an ID from the source recording position check section 304, and an inverse DCT section 308; An inverse quantization unit 310 that adds and inverse quantizes a quantization coefficient from an output, and an inverse shuffling unit 312 that inversely shuffles the output of the inverse quantization unit 310 according to the output of the ID checking unit 316; Error from the output of the reverse shuffling section 312 Determining consists of error correction unit 314. The

4 is a track data format in which a sync block according to the present invention is recorded on one track, and FIG. 5 is a data arrangement diagram for sync blocks of a track according to the present invention.

6 is an example of a data track format to be recorded according to the present invention, FIG. 7 is an example of a source control head according to the present invention, and FIG. 8 is a make code header according to the present invention.

Therefore, a specific embodiment of the present invention will be described in detail with reference to FIGS.

The ATV transformer layer buffer 101, as a buffer, receives the ATV signal and temporarily stores it for recording the bitstream, and then encrypts the data to be recorded by the position checker in the source recording position checker 102. Determine whether or not. 7 shows a pack of a source control header for the source data, each software and data has a pack header when recording image data in the SDVCR, and the pack header of the SDVCR is divided into 9 groups, 9 Each group is divided into VAUX, AAUX, and MIC servo code areas and recorded on the track format. The above area is divided into a main area part and an auxiliary area part, and each header may be referred to as a bundle of control signals representing various types of information. 7 shows an example of a source control header recorded in the main area of VAUX, CGMS indicates a copy generation management system, a copy input indicates a source input, and COPY GEN indicates how many times the software has been copied. . The SS is a flag indicating the source and the recorded position. The functions of the two-bit SS flag are as follows.

00 b: Scrambled Sourec with audience restrictions

01 b: Scrambled Source with out audience restrictions

10 b: Sourec with audience restrictions descrambled Sourec with audience restrictions

11 b: Noinformation

If there is a need to encrypt data at the time of recording, set the above flag to 1 and operate the microcomputer to accept the password (ID) in the system control section. The ID insertion unit 104 records the password processed by the source recording position check unit 102 and accepted by the remote controller controller in the maker code head of FIG. As shown in Figure 8, the password is recorded in the area left available for use by each producer. The SDVCR shuffling unit 106 shuffles data when the user wants to encrypt in the source recording position check unit 102, but only when the user wants to record the data without encryption in the source recording position check unit 102. The data is transferred to the sync block formatting unit 108 without shuffling data. The sync block formatting unit 108 formats the ATV signal according to the SYNC block to fit the recording format of the SDVCR as shown in FIG. 6, but actually adds the SYNC and ID and modifies the PACK header to record the track. The processing unit 110 performs recording processing of the SDVCR. FIG. 4 shows an example of track data format in which a sync (SYNC) block is recorded on one track, and FIG. 5 shows an example of arrangement of data for sync blocks of a track.

The ATV data recorded on the tape is read out by the playback processing unit 112 and played back, and then the SDVCR format-formatted data in the synchronously separated inverse formatting unit 114 generates a pure ATV signal, and inserts the ID of FIG. In step 104, the added SYNC and ID are removed. The signal from which the SYNC and ID are removed is checked by the source recording position check unit 116 by checking the system control pack header generated by the system controller to check the state of the recorded data of the currently playing tape. Check the 2 bits of position check to switch to the mode that allows input of ID. The result data processed by the source recording position checking unit 116 is input to the ID checking unit 118. The ID checker 118 searches whether or not the password described in FIG. 8 matches according to the flag checked by the source record position checker 116. If the password inputted from the microcomputer matches the password already recorded, the SDVCR After passing through the inner packing, a signal is transmitted to the ATV decoder 122 if the password does not exist or does not match.

The signal passing through the ID check unit 118 is applied to the SDVCR reverse shuffling unit 120. The SDVCR reverse shuffling unit 120 returns the data encrypted by the reverse shuffling of the SDVCR back to its original position, and this output is output. Is decoded in the ATV decoder 122. That is, the ATV bit stream has audio data and video data on the transport layer, and is recorded in the video area on the SDVCR tape format. Since the SDVCR is just a recording medium, the ATV signal input to the ATV decoder 122 should maintain its original signal form, and if the SS flag of the source control header has already been set by the existing film production company or software production company, it is played back. There is a need for a method that ensures that only authorized persons are allowed to play. Therefore, FIG. 3 will be described in detail with reference to the SDVCR playback system block diagram. In FIG. 3, the playback processing unit 302 reads and reproduces the data recorded on the tape and inputs it to the source recording position check unit 304. FIG. The source recording position check unit 304 reads the source control head according to the recorded position check result of the source in the system control, and searches whether it is in the encryption mode. Check if the match is found. At this time, the user inputs the password using the remote controller or the front panel, and inputs the result to the ID checking unit 306 based on the result checked by the source recording position check unit 304, and the ID checking unit 306 The password is checked, but the password entered by the user is checked whether the password entered by the user is the same. If the passwords are not the same, a reset signal is generated to be deshuffled by the deshuffling section 312. On the other hand, the output of the source recording position check unit 304 is input to the shuffling unit 306 so that the data recording order is reversed back and forth in the time axis direction so as to easily correct the burst error. And extends the quantization transformation coefficient in the inverse magnetizer 310 to restore the value of the sampling transmission system.

The output of the dequantization unit 300 is input to the deshuffling unit 312 to determine whether or not to deshuffle the reset signal from the ID checking unit 311. When the reset signal is 1, reverse shuffling is not performed. The signal subjected to the reverse shuffling is corrected by the error correction unit 314. Therefore, the method of encrypting the data recorded and played back on the SDVCR can be realized by using the existing SDVC block as it is and adding only the part for checking the password.If the SDVCR is not reverse shuffled, the image cannot be recognized. Therefore, only authorized users can use it. In the case of recording and reproducing the ATV signal to the SDVCR, the shuffling portion of the SDVCR is used for recording, and during playback, it is determined whether or not to reverse shuffling according to the password, and general digital data is recorded to the SDVCR. It can also be used similarly.

As described above, there is an advantage that only copyright protection and limited use can be used for specific software, i.e., digital VCR tapes requiring security.

Claims (7)

In a video signal recording system of an SDVCR system, an ATV transformer layer buffer 101 for temporarily receiving an ATV signal and storing a bit stream and encrypting data to be recorded from an output of the ATV transformer layer buffer 101. Source recording position check unit 102 for determining whether or not to do so, and ID insertion unit 104 for receiving and inserting a password (ID) when encryption is required for the data value determined from the source recording position check unit 102. And the SDVCR shuffling unit 108 which changes the data recording order from the time axis direction so as to easily correct a burst error with respect to data that the user wanted to encrypt at the output of the ID inserting unit 104, and the ID inserting unit. At the output of 104, the data that does not need to be encrypted or the data shuffled by the SDVCR shuffling section 105 is received to fit the SDVCR recording format. Recording block of the digital video cassette recorder, characterized in that it comprises a sync block formatting unit 108 for formatting the block according to the sync block, and a recording processing unit 110 for recording the output of the sync block formatting unit 108 on the ADVCR tape. Data encryption processing circuit during playback. A reproduction system of an SDVCR system, comprising: a reproduction processing unit (112) for reading an ATV signal from a signal recorded on the SDVCR tape, and a pure ATV signal for data formatted according to the SDVCR format from the output of the reproduction processing unit (112); Checks the state of the recorded data of the currently playing tape by checking the system control defect head from the output of the sync block deformatting unit 114 and the sync block deformatting unit 114 to remove the sync and the ID to make it. A source recording position checking unit 116, an ID checking unit 118 for checking whether or not a password matches the flag checked by the source recording position checking unit 116, and restoring the encrypted data back to its original position. A digital video car comprising a SDVCR reverse shuffling unit 120, an ATV decoder 122 for decoding the ATV signal passed through the ID checking unit 118 and the SDVCR reverse shuffling unit 120. When recording / reproducing bit of the recorder data encryption processing circuit. In a data encryption system at the time of reproduction of an SDVCR system, a reproduction processing unit (302) for reading and reproducing a signal recorded on the SDVCR tape, and an encryption mode by reading a source control head at a source recording position check of the reproduction processing unit (302). A source recording position check unit 304 for searching for recognition, a shuffling unit 306 for shuffling to decode from input data that has passed through the source recording position check unit 304, and a shuffling unit in the shuffling unit 306 An inverse DCT section 308 for upsampling the data to expand the data, an ID checking section 316 for checking the presence or absence of an ID from the source recording position check section 304, and an output of the inverse DCT section 308; An inverse quantization unit 310 for inverse quantization by adding a quantization coefficient from the inverse, an inverse shuffling unit 312 for inversely shuffling the output of the inverse quantization unit 310 according to the output of the ID checking unit 316, To the output of the reverse shuffling section 312 Since error correction error correcting the digital video cassette recording / playback data encryption processing circuit of the recorder, characterized by consisting of a unit 314 for. A method of recording tape data using an SDVCR, wherein the data to be recorded on the tape and the recorded data are encrypted using the source recording position flag of the source control header, but the data to be recorded when the data is written to the tape is encrypted. And a data control processing circuit for recording / reproducing a digital video cassette recorder, characterized in that the data to be recorded by determining whether or not the data to be recorded is data to be encrypted is indicated by using a source control header. 5. The data encryption processing circuit of claim 4, wherein the data to be encrypted on the tape is assigned a code by using a maker code header so as to know whether the tape is licensed or not. . 5. The data encryption processing circuit of claim 4, wherein the data to be encrypted is encrypted using a shuffling portion of the SDVCR. In the video signal reproducing method using the SDVCR, if the data recorded on the tape during the SDVCR playback is encrypted data, the reverse shuffling of the SDVCR is used if the user is authorized, and the reverse shuffling is not performed to the unauthorized user. And data encryption processing circuit for recording / reproducing a digital video cassette recorder, so as to protect data recorded at the time of reproduction from an unauthorized user.