Copy prevention method and apparatus for digital video system
A copy prevention method and apparatus for a digital video system is disclosed including the steps of: (a) adding a header area of a header start code and key field to a reproduced bit stream: (b) decrypting and transmitting the bit stream to which the header area is added: (c) detecting a key field of the decrypted and transmitted bit stream and detecting copy prevention information; and (d) encrypting the bit stream according to information detected from stop (c) and recording it an tape.
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This is Notice: More than one reissue applications have been filed for the reissue of U.S. Pat. No. 6,347,144. The reissue applications are application Ser. Nos. 10/737,671, 10/737,672 (now U.S. Pat. No. Re. 39,319), Ser. No. 11/040,606 (now U.S. Pat. No. Re. 41,074), and Ser. No. 11/040,607 (the present application) which are all reissues of U.S. Pat. No. 6,347,144; Ser. Nos. 10/981,797, 10/737,672, 10/909,248 and 10/981,798 which are all divisionals of Ser. No. 10/737,672; Ser. No. 12/139,161 which is a continuation of Ser. No. 10/909,248; and Ser. Nos. 12/405,011 and 12/405,053 which are both divisionals of Ser. No. 10/981,798. U.S. Pat. No. 6,347,144 resulted from application Ser. No. 09/497,465, which is a continuation of application Ser. No. 09/053,288, filed Apr. 1, 1998, now U.S. Pat. No. 6,028,932, which is a continuation of Ser. No. 08/562,042, filed Nov. 22, 1995, now U.S. Pat. No. 5,761,302, issued Jun. 2, 1998.
BACKGROUND OF THE INVENTIONThe present invention relates to a copy prevention technology for a digital video system, and more particularly, to a copy prevention method and apparatus for a digital VCR to which encryption is introduced to display a picture only in a VCR internally containing a corresponding encryption code, thereby preventing tape from being copied.
General copy prevention methods for analog VCR are presented in U.S. Pat. Nos. 4,819,098, 4,571,642 and 4,577,216.
First, U.S. Pat. NO. 4,819,098 discloses a method in which an interference signal is inserted into a video waveform in an automatic gain control circuit (AGC) of a VCR. Here, the inserted signal does not affect the AGC of its monitor but has the AGC of the VCR record an accurate level of signal on a video tape.
In U.S. Pat. No. 4,571,642, there is presented a method in which a phase noise or other corrected signal is inserted into the chrome burst of a video waveform.
However, all the conventional technologies insert a distributing signal to an analog signal using the difference between a circuit of a monitor and a corresponding circuit of a VCR. Some VCRs may perform copy normally despite of copy prevention. Some monitors cannot display images of the original video tape. A conventional copy prevention introduced to an analog VCR system is hard to be applied to digital storage media (DSM).
Specifically, in a satellite receiver or high-definition TV decoder, as shown in
The PES header contains a PES header flag area of 14 bits which is a field for DSM such as digital VCR, and a PES header field having a variable length. The PES header flag area includes 1-bit copyright (CR) flag, 1-bit original-or-copy (OC) flag, 2-bit PD flag, 1-bit TM flag, and 1-bit AC flag.
The PES header field varies in length, and part thereof is set by the PC, TM and AC flags. A PTS/DTS area is not present if the value of the PD flag is “00”. It is 40 bits if the value “10”. If the value is “11”, the area is 80 bits. A DSM trick mode field is not present if the TM flag is “0”. If the flag is “1”, the field is 8 bits. An additional copy information field is 8 bits if the AC flag is “1”.
When recording is carried out by the satellite receiver or high-definition TV decoder and compressed video data is encoded in encoder 101, it is converted into a packet form in packet processing portion 122 as shown in
When the outputs of packet processing portions 102 and 104 are multiplexed in transmission multiplexer 105, a fixed transmission stream shown in
This public-key encryption system has all users U hold unique encryption algorithm EPKU and description algorithm DPKU. Here, encryption algorithm EPKU for the public-key is opened as a public-key to key supply portion 107. Decryption algorithm DPKU for secret key is kept in secret. The characteristics of EPPKU and DPKU are as follows.
First, with respect to all users U and message m transmitted, DPKU(EPKU(m))=m.
Second, encryption algorithm EPKU and decryption algorithm DPKU do not require complicated calculation.
Third, it is impossible to find DPK″U satisfying DPK″U(EPKU(m))=m from encryption algorithm EPKU.
In the encryption system having the above characteristics, as shown in
Key decrypter 108 receiving the key information from key supply portion 107 outputs an algorithm DPKB corresponding to encryption algorithm EPKB, decrypter 109 decrypts (DPKB(c))=m) the output of encrypter 106 with decryption algorithm DPKB, and then transmits user B. In other words, only user B can decrypt decryption algorithm DPKB corresponding to encryption algorithm EPKB.
A concept developed from the public-key encryption is presented in U.S. Pat. No. 4,405,829. This public-key encryption system is called RSA system. A method in which the RSA public-key encryption is efficiently calculated via batch processing is presented in U.S. Pat. No. 4,964,164.
However, this public-key encryption is inappropriate for high-velocity encryption. A CA system is to present illegal view. However, there is no method of protecting a program distributed through a digital storage medium such as digital VCR.
SUMMARY OF THE INVENTIONTherefore, it is an object of the present invention to an illegal copy prevention method and apparatus for a digital video system in which, in copy tape, encrypted key information is transmitted and recorded so that a copied tape is reproducible only in a VCR having a corresponding encrypted key information, thereby prevented copy.
To accomplish the object of the present invention, there is provided a copy prevention method for a digital video system comprising the steps of: (a) adding a header area of a header start code and key field to a reproduced bit stream; (b) decrypting and transmitting the bit stream to which the header area is added; (c) detecting a key field of the decrypted and transmitted bit stream and detecting copy prevention information; and (d) encrypting the bit stream according to information detected from step (c) and recording it on tape.
For the object of the present invention, there is provided a copy prevention apparatus for a digital video system comprising: a reproduction block for adding key information to a reproduced bit stream, and decrypting and transmitting it; and a recording block for searching key information of the bit stream transmitted from the reproduction block is extract copy prevention information, and encrypting and recording the bit stream according to the extracted copy prevention information.
The reproduction block comprises: reproduction means for reproducing data recorded on tape; key insertion means for adding key information to the bit stream of the reproduction means; and decryption means for decrypting the output of the key insertion means and transmitting it to a recording-side VCR.
The recording block comprises: key detecting/correcting means for detecting key information from the transmitted bit stream of a reproducing-side VCR: copy prevention information detecting means for searching the key information detected from the key detecting/correcting means to detect copy prevention information; encrypting means for encrypting the bit stream according the copy prevention information of the copy prevention information detecting means; and recording means for recording the bit stream encrypted in the encrypting means.
The copy prevention information detecting means comprises: a PES header detecting portion for detecting a PES header from parallel data output from the key detecting/correcting means; and a copy prevention information extractor enabled by a PES header detection signal of the PES header detecting portion to detect an additional copy information field.
Hereinafter, a preferred embodiment of the present invention will be described below with reference to the attached drawings.
Referring to
As shown in
Referring to
As shown in
The operation and effect of the present invention will be explained below. Generally, in case of reproducing or copy recording data on tapa, connections between systems are made as shown in
With those connections, an MPEG bit stream reproduced from VCR A is input to a satellite receiver or high-definition TV so that it cannot be recognized whether the stream is displayed on a screen or input to VCR B and recorded on another video tape.
For this reason, according to the present invention, in case that the bit stream reproduced from VCR A is copied from VCR B, information on copy prevention is transmitted to VCR B from VCR A. VCR B analyzes this information which is recorded with the bit stream.
Here, the insertion position of the copy prevention information contained in a GA bit stream is very limited because it must not affect decoding of the decoder of the satellite receiver or high-definition TV so that an image is displayed normally on a monitor. The copy prevention information may be inserted into the front end of the MPEG bit stream or inside the PES header.
When the MPEG bit stream is decoded in units or group of picture (GOP), the respective GOPs are classified by their cop start codes. This is useful in transmitting initialization data to a recording-side VCR because decoding is never affected even when a slight amount of data is added to the front end of the MPEG bit stream.
The case of inserting the copy prevention information into the PES header is useful in repeated transmission of information because copy prevention of a recording medium such as DSM is decided using CR and OC flaps of the PES header and additional copy information field. In this case, there are a variety of copy preventing methods.
First, when a mode of “No Copy” is detected from the additional copy information field of the PES header, VCR B is not able to enter its recording mode.
Second, when a mode of “Copy Permitted” is detected in order to implement a copy prevention such as DAT mode, VCR B records but “No Copy” mode is recorded in the additional copy information field to interrupt recopying from a copying tape. This means that a secondary source, but a third source tape cannot.
Third, for “Back-up Copy”, tape B copied from VCR B is reproducible normally only in VCR A. According to this method, reproducing-side VCR A encrypts the bit stream with its own inherent key and records it on tape so that only reproducing-side VCR A decrypts the MPEG bit stream recording on the tape. For every VCR set, a unique key is provided, encrypted by VCR's key and recorded on tape B. However, the VCR set for recording tape B is VCR B and tape B is encrypted by VCR A's key so that VCR A's key needs to be transmitted to VCR B with GA bit stream.
Accordingly, when the key information of VCR A is transmitted as a header in advance prior to the bit stream in the “Back-up Copy”, it is recorded at the front end of tape B, which satisfies the insertion position of the copy prevention information mentioned before.
Here, as shown in
In case of recording the bit stream shown in
Here, a header area added to the front of the MPEG bit stream is formed with a tape header start code, that is, the header identifier code, and a key field for storing key information. In case of encrypting the MPEG bit stream in units of GOP, encryption blocks are classified by the packet start code prefix and stream ID of the PES header. The encryption block is a basic unit of encryption and can change whether encryption is performed in units of the encryption block, and encryption algorithm and key selection. Here, the encryption blocks must not be encrypted until the additional copy information field of the PES header. Encryption is performed until the end of the encryption block after the additional copy information field. The first ‘transmission header’ is not encrypted.
The operation of performing the “back-up Copy” mode by adding the header will be described below.
First, in copying, when recording data of tape A is encrypted, reproducing-side VCR A decrypts it using the key information of the key field so as to make message m. Its key information is added to the header and transmitted in the format of
Recording-side VCR B records the key information transmitted from reproducing-side VCR A on the header of copying tape B and then records the encrypted bit stream. Here, when the key information is transmitted from reproducing side to recording side, for security, a public-key encryption may be employed to the system because the information may be exposed to a pirate.
Such public-key encryption system ensures the secret of data even though the public-key is exposed but cannot be processed in real-time due to a great amount of calculation. Therefore, this system is not improper when the MPEG bit stream is encrypted directly. The “Back-up Copy” can be implemented when the MPEG bit stream is encrypted using a block-cipher algorithm or stream-cipher algorithm such as DES and a key used is encrypted in the public-key encryption.
In this case, every VCR u incorporates encryption algorithm EPKU corresponding to the public-key and decryption algorithm DPKU corresponding to the secret key. Encryption algorithm EPKU takes a power key of VCR u, and decryption algorithm DPKU an internal key of VCR u.
Here, the internal key may be opened to the public. Reproducing-side VCR A transmits the internal key on the key field of the header because another VCR encrypts using the internal key. Recording-side VCR B randomly selects a key Y used in the block-cipher algorithm such as DES and encrypts it with the public-key encryption system using an external key EPKA. The result is recorded on the key field of copying tape B.
Sequentially, the data is divided into encryption blocks and encrypted and recorded in the block-cipher algorithm using key Y. In this method, the bit stream of
When copying tape B is reproduced in reproducing-side VCR A, key Y can be restored by decryption DPKA[EPKA(Y)] in which data is decrypted properly. In other VCRs, key Y cannot be found, which disables the decryption of the bit stream.
As embodiment of the present invention shown in
When playback starts for tape copying, reproducing portion 1 detects data recorded on tape as shown in
When the bit stream of
Copying prevention information detecting portion 5 searches the PES header area to detect the additional copy information field. Here, though a slight amount of information is recorded in the additional copy information field, redundancy is provided in several areas of the bit stream to increase reliability of information transmitted.
Copy prevention information detecting portion 5 extracts the value of AC flag from the PES header flag in order to calculate the position of the additional copy information field because it varies within the PES header. Here, when copy prevention information correcting portion 6 corrects the output of copy prevention information detecting portion 5, encrypting portion 7 performs encryption using the block-cipher algorithm such as DES. Here, copy prevention information correcting portion 6 performs correction while the input data is stored in a RAM. Accordingly, encrypting portion 7 records the encrypted bit stream on tape in recording portion 8. Because the key information of the reproducing-side VCR is added on the copying tape, only a VCR having this key information can reproduce tape normally.
As shown in
PES header detector 10 for detecting the PES header is formed as shown in
Here, packet start code detecting portion 13 searches the bit stream shown in
Meanwhile, stream ID code detector 14 searches the output of second flipflop 12 and detects the stream ID area of the PES header. Then, detection signal is-sid shown in
Here, copy prevention information extractor 20 for detecting the copy prevention information is formed as shown in
D-flipflop 23 is synchronized to the CR flag or the output of D-flipflop 21 shown in
Copy prevention position detector 25 searches the PD, TM and AC flags of the parallel data of PES header detector 10 shown in
D-flipflop 27 synchronized to HIGH output rco of counter 26 holds the additional copy information field from the parallel data of D-flipflop 21 shown in
As described above, in the copy prevention method and apparatus for a digital video system of the present invention, a key information is recorded with a bit stream so that a VCR having the key information reproduces tape normally, thereby preventing illegal copy of tape. In addition, for key information transmission, the public-key encryption is introduced to disable a pirate to release the copy prevention, increasing reliability of copy prevention.
Claims
1. A copy prevention method for a digital video system comprising the steps of:
- (a) receiving a digital data stream reproduced from a digital medium;
- (b) detecting an encryption key, which is a portion of said received digital data stream;
- (c) decrypting said encryption key using key information;
- (d) decrypting said received digital data stream based on said decrypted encryption key; and
- (e) transmitting said decrypted digital data stream to at least one of a monitor and a digital recorder.
2. A copy prevention method for a digital video system as claimed in claim 1, wherein said key information is predetermined by said digital video system.
3. A copy prevention method for a digital video system as claimed in claim 1, wherein said decrypting step (d) is operated in units of predetermined block of said received digital data stream.
4. A copy prevention apparatus for a digital video system comprising:
- receiving means for receiving a digital data stream reproduced from a digital medium;
- a key detector to detect an encryption key, which is a portion of said received digital data stream;
- a decryption unit to decrypt said encryption key using key information and to decrypt said received digital data stream based on said decrypted encryption key; and
- a controller to control transmission of said decrypted digital data stream to at least one of a monitor and a digital recorder.
5. A copy prevention apparatus for a digital video system as claimed in claim 4, wherein said key information is predetermined by said digital video system.
6. A copy prevention apparatus for a digital video system as claimed in claim 4, wherein said decryption unit is operated in units of predetermined block of said received digital data stream.
7. A copy prevention method for a digital video system comprising the steps of:
- (a) receiving a digital data stream reproduced from a digital medium;
- (b) detecting an encryption key, which is a portion of said received digital data stream;
- (c) decrypting said encryption key using key information;
- (d) decrypting said received digital data stream based on said decrypted encryption key.
8. A copy prevention method for a digital video system as claimed in claim 7, wherein said key information is predetermined by said digital video system.
9. A copy prevention method for a digital video system as claimed in claim 7, wherein said decrypting step (d) is operated in units of predetermined block of said received digital data stream.
10. A copy prevention apparatus for a digital video system comprising:
- receiving means for receiving a digital data stream reproduced from a digital medium;
- a key detector to detect an encryption key, which is a portion of said received digital data stream;
- a decryption unit to decrypt said encryption key using key information and to decrypt said received digital data stream based on said decrypted encryption key.
11. A copy prevention apparatus for a digital video system as claimed in claim 10, wherein said key information is predetermined by said digital video system.
12. A copy prevention apparatus for a digital video system as claimed in claim 10, wherein said decryption unit is operated in units of predetermined block of said received digital data stream.
13. A copy prevention method for a digital video system comprising the steps of:
- (a) receiving a digital data stream reproduced from a digital medium;
- (b) detecting an encryption key, which is a portion of said received digital data stream;
- (c) decrypting said encryption key using predetermined key information;
- (d) decrypting said received digital data stream based on said decrypted encryption key.
14. A copy prevention method for a digital video system as claimed in claim 13, wherein said decrypting step (d) is operated in units of predetermined block of said received digital data stream.
15. A copy prevention apparatus for a digital video system comprising:
- receiving means for receiving a digital data stream reproduced from a digital medium;
- a key detector to detect an encryption key, which is a portion of said received digital data stream;
- a decryption unit to decrypt said encryption key using predetermined key information and to decrypt said received digital data stream based on said decrypted encryption key.
16. A copy prevention apparatus for a digital video system as claimed in claim 15, wherein said decrypting unit is operated in units of predetermined block of said received digital data stream.
17. A copy prevention method for a digital data system, comprising the steps of:
- (a) receiving first key information;
- (b) encrypting second key information using said first key information;
- (c) encrypting digital data streams using said second key information; and
- (d) recording at least said encrypted second key information and said encrypted digital data streams on a digital medium.
18. The method of claim 17, wherein said (b) randomly selects said second key information.
19. The method of claim 17, wherein said step (c) encrypts said digital data streams in blocks.
20. A copy prevention apparatus for a digital data system, comprising the steps of:
- an encryption unit receiving first key information, encrypting second key information using said first key information, and encrypting digital data streams using said second key information; and
- a controller controlling recording of at least said encrypted second key information and said encrypted digital data streams on a digital medium.
21. The apparatus of claim 20, wherein said encryption unit randomly selects said second key information.
22. The apparatus of claim 20, wherein said encryption unit encrypts said digital data streams in blocks.
23. A recording medium having a data structure for controlling operation of copy prevention function in a digital data processing device, comprising:
- a digital data area storing digital data encrypted using first key information; and
- a key information area storing said first key information encrypted using second key information, said first key information operatively controlling the decryption of said encrypted digital data in a digital data process device.
24. A copy prevention method for a digital data system, comprising:
- receiving first key information, said first key information for encrypting digital data;
- encrypting said first key information using second information; and
- transferring said encrypted first key information.
25. The method of claim 24, wherein said encrypting step public key encrypts said second key information.
26. The method of claim 24, wherein said transferring step records said encrypted first key information on a digital medium.
27. The method of claim 24, wherein said transferring step transmits said encrypted first key information.
28. A copy prevention apparatus for a digital data system, comprising:
- an encryption unit receiving first key information, said first key information for encrypting digital data, and encrypting said first key information using second key information; and
- a controller controlling a transfer of said encrypted first key information.
29. The apparatus of claim 28, wherein said encryption unit public key encrypts said first key information.
30. The apparatus of claim 28, wherein said controller controls recording said encrypted first key information on a digital medium.
31. The apparatus of claim 28, wherein said controller controls transmitting said encrypted first key information.
32. A copy protection method for a digital data system, the method comprising:
- detecting, via a decryption device included in the digital data system, key information and copy prevention information from received digital data or from a signal reproduced from a digital recording medium, the key information for decrypting digital content from the received digital data or from the signal, the copy prevention information for indicating at least whether or not a copy of the digital content is permitted; and
- controlling, via a controller within the digital data system, a copy protection function for the digital content based on the copy prevention information and the key information,
- wherein said controlling step controls the copy protection function such that the digital content is not copied, when the copy prevention information indicates that a copy is not permitted, and
- wherein said copy protection function includes identifying whether the digital content is encrypted based on classification information detected from the digital data, and decrypting, via the decryption device according to control of the controller, the digital content based on the key information if the digital content is encrypted.
33. The method of claim 32, wherein said controlling step (b) controls the copy protection function such that the digital content is decrypted only when the key information is detected.
34. The method of claim 32, wherein the copy prevention information includes information indicating a first recording source can copy the digital content onto a first recording medium but a second recording source can then not copy the digital content from the first recording medium to a second different recording medium.
35. An apparatus for copy prevention, comprising:
- a receiving device configured to receive a digital data stream;
- a detecting device configured to detect an encryption key from the received digital data stream, and to detect copy prevention information from the received digital data stream, the encryption key for decrypting digital content from the received digital data stream and the copy prevention information for indicating whether or not a copy of the digital content of the digital data stream is permitted; and
- a controller configured to control a copy protection function for the digital content based on the detected copy prevention information and key information,
- wherein said controller is configured to control the copy protection function such that the digital content is not copied, when the copy prevention information indicates that a copy is not permitted, and
- wherein said controller is configured to identify whether the digital content is encrypted based on classification information detected from the digital data stream, and control to decrypt the digital content based on the key information if the digital data stream is encrypted.
36. The apparatus of claim 35, further comprising:
- a decryption device configured to decrypt the digital content based on the encryption key, according to the control of the controller.
37. The apparatus of claim 36, wherein said decryption device is configured to operate on units of predetermined blocks of the digital content, according to the control of the controller.
38. The apparatus of claim 35, wherein the encryption key is predetermined by the digital content.
39. The apparatus of claim 35, wherein the copy prevention information includes information indicating a first recording source can copy the digital content onto a first recording medium but a second recording source can then not copy the digital content from the first recording medium to a second different recording medium.
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Type: Grant
Filed: Jan 24, 2005
Date of Patent: Nov 15, 2011
Assignee: LG Electronics Inc. (Seoul)
Inventor: Tae Joon Park (Gyeonggido)
Primary Examiner: Pierre E Elisca
Attorney: Birch, Stewart, Kolasch & Birch, LLP
Application Number: 11/040,607
International Classification: H04L 9/00 (20060101); G06F 21/00 (20060101);