Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2004-09-01
2009-12-08
Chai, Longbit (Department: 2431)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S177000, C713S178000, C713S179000, C726S027000, C726S028000, C726S029000, C726S030000, C726S003000, C726S004000, C726S005000, C726S006000, C726S007000
Reexamination Certificate
active
07631189
ABSTRACT:
An apparatus for recording additional information hard to analyze in an information recording medium, a reproducer, a recording medium, a method, and a computer program for the same are provided. Bit values set at a plurality of DC control bit information setting positions set in a recording frame are decided based on constituent bit information of additional data, and additional data such as key information used for decoding contents is recorded in the information recording medium. In the reproducer, the additional data constituent bit information can be acquired by detecting the bit position set at a selected DC control bit storage position in the additional data-associated recording frame. With the configuration, it is possible to embed additional information such as key information used for decoding contents, key production information, contents reproduction control information, and copying control information with a format hard to analyze and also to accurately read out for data reproduction.
REFERENCES:
patent: 2001/0028318 (2001-10-01), Hogan
patent: 2005/0044083 (2005-02-01), Sako
patent: 2002-367282 (2002-12-01), None
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patent: 2003-303475 (2003-10-01), None
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patent: WO 02/15185 (2002-02-01), None
Ichinose Tsutomu
Sako Yoichiro
Chai Longbit
K&L Gates LLP
Sony Corporation
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