Copper & Dunham LLP
Illegal view/copy protection method and apparatus for digital broadcasting system
 An illegal view/copy protection method for a digital broadcasting system is disclosed including an audio/video signal transmission step for multiplexing and transmitting audio/video bit stream scrambled in control words and information where the control words and CPTC information for illegal view/copy protection are encrypted; and an audio/video reception step for decrypting the transmitted bit stream to analyze the CPTC information and control words, deciding whether recording is allowed or not to be recorded on cassette tape, and using the control words, performing descrambling and decoding to output audio/video signals to a monitor, thereby protecting copyright. 
LG Electronics Inc.
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Yung Gil Tae Joon
Kim Park