Cryptography – Video cryptography – Copy protection or prevention
Reexamination Certificate
2007-07-03
2007-07-03
Moise, Emmanuel L. (Department: 2137)
Cryptography
Video cryptography
Copy protection or prevention
C380S201000, C380S239000, C369S047100, C369S047120, C705S057000, C725S031000, C726S031000
Reexamination Certificate
active
10917489
ABSTRACT:
The invention provides a recording media player and a recording media recorder provided with a high-security copy protection system of less complexity. A recording media player and/or recorder provided with a copy protection system stubborn to attacks and highly flexible in dealing with recording media of various copy conditions. For this purpose, various distributed copyright protection information (DCPI) values are used. The DCPI values include water marks in case of an MPEG stream, Copy Generation Management System (CGMS) codes, EMI (encryption mode indicator) in case of an IEEE1394-1995 interface, and user defined DCPI values. The recording is achieved such that DCPI values are recorded in user-unrewritable (or user-inaccessible) areas of the recording medium as long as possible.
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Higurashi Seiji
Sugahara Takayuki
Callahan Paul
Connolly Bove & Lodge & Hutz LLP
Moise Emmanuel L.
Victor Company of Japan Ltd.
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