초록 ▼

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

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 step (c) and recording it on tape.

대표청구항 ▼

[ What is claimed is:] [13.] A copy prevention apparatus for a digital video system comprising:key detecting means for detecting key information from transmitted digital video bit streams;copy prevention detection means for detecting and decoding said copy prevention information from said transmitte

[ What is claimed is:] [13.] A copy prevention apparatus for a digital video system comprising:key detecting means for detecting key information from transmitted digital video bit streams;copy prevention detection means for detecting and decoding said copy prevention information from said transmitted digital video bit streams;encrypting means for encrypting said digital video bit streams based on said decoded copy prevention information; andrecording means for recording said key information and said copy prevention information and said digital video bit streams to a digital medium.