Illegal view/copy protection method and apparatus for digital br

Details Illegal view/copy protection method and apparatus for digital br Illegal view/copy protection method and apparatus for digital br

1995-10-27

1998-08-25

Cangialosi, Salvatore

Cryptography

Cryptanalysis

380 4, 380 20, H04L 900

Patent

active

057990816

ABSTRACT:
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.

REFERENCES:
patent: 4595950 (1986-06-01), Lefberg
patent: 4945563 (1990-07-01), Horton et al.
patent: 4991208 (1991-02-01), Walker et al.
patent: 5315448 (1994-05-01), Ryan
patent: 5418853 (1995-05-01), Kanota et al.
patent: 5574787 (1996-11-01), Ryan

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