Copy prevention method and apparatus for digital video system
First Claim
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1. 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.
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Abstract
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 form step (c) and recording it on tape.
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Citations
16 Claims
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1. A copy prevention method for a digital video system comprising the steps of:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A copy prevention apparatus or a digital video system comprising:
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a reproduction block for adding key information to a reproducing bit stream, and decrypting and transmitting it; and a recording block for searching key information of the bit stream transmitted from said reproducing block to extract copy prevention information, and encrypting and recording the bit stream according to the extracted copy prevention information. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification