Cryptography – Video cryptography – Copy protection or prevention
Patent
1998-06-12
2000-10-17
Laufer, Pinchus M.
Cryptography
Video cryptography
Copy protection or prevention
380239, 360 60, 705 57, 386 94, H04N 7167
Patent
active
RE0369195
ABSTRACT:
[A copy prevention method and apparatus of a digital magnetic recording/reproducing system performs the copy prevention function by encoding to insert a marker involving copy prevention function information and executing the function and allows a program supplier to realize a desired copy prevention function of various patterns, in which the marker formed by a control word for scrambling audio and video bit straps and copy prevention information for preventing an illegal copy is encrypted by an encoded key to be multiplexed with the audio and video bit strips scrambled by the control word. The marker transmitted is detected from the bit strips to be decrypted and analyzed by the encoded key to determine whether the copy is permitted or not, so that the detected marker is updated to be recorded on a video tape and the control word is produced from the marker to perform the descrambling to supply the result to a monitor to be displayed. Thus, the program supplier selects the copy prevention function, and a separate format converting apparatus is not required since a field defined within a GA format is utilized while an existing DVCR is not need to be changed for performing the copy prevention function as the data amount to be recorded is not increased.] The method and apparatus for transmitting and/or recording digital data generates control data and initializes a scrambler based on the control data. Digital data is scrambled using the scrambler. A marker is formed including the control data and the scrambled digital data and the marker are transmitted or recorded as a packet. The packet includes a header, which includes the marker. When the scrambled digital data and the marker, as a packet, are received, the marker is detected and the control data is obtained from the marker. A descrambler is initialized based on the control data, and the scrambled digital data is descrambled using the descrambler.
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Laufer Pinchus M.
LG Electroncs Inc.
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