System and method for controlling copying and playing of digital

Details System and method for controlling copying and playing of digital System and method for controlling copying and playing of digital

1996-03-08

1999-04-20

Buczinski, Stephen C.

Cryptography

Cryptanalysis

380 4, H04N 7167

Patent

active

058964541

ABSTRACT:
A system and method for preventing effective copying of digital recordings. A copy-state code accompanies each recording, one state of which represents that no copies at all are to be made of the recording. Compatible players are designed to prevent play of any writable disk which includes a "no-copy" code. It is the inconsistency between the code and the medium containing it that causes play of the medium to be inhibited.

REFERENCES:
patent: 4796220 (1989-01-01), Wolfe
patent: 5371792 (1994-12-01), Asai et al.
patent: 5418853 (1995-05-01), Kanota et al.
patent: 5488410 (1996-01-01), Lieberfarb et al.
patent: 5563947 (1996-10-01), Kikinis
patent: 5574787 (1996-11-01), Ryan

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