Copy prevention method and apparatus for digital video system
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United States of America Patent
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Nov 22, 2011
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N/A
app pub date -
Dec 17, 2003
filing date -
Nov 26, 1994
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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 from stop (c) and recording it an tape.
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