Cryptography – Key management – Having particular key generator
Reexamination Certificate
2006-08-08
2006-08-08
Revak, Christopher (Department: 2131)
Cryptography
Key management
Having particular key generator
C713S189000, C713S190000, C713S191000, C713S193000, C380S201000, C380S202000, C380S203000, C380S030000, C380S278000, C380S281000, C380S284000, C705S051000, C705S057000
Reexamination Certificate
active
07088822
ABSTRACT:
By recording a digital signature and a public key certificate when recording data on an information recording medium, a recording device having recorded content can be specified. If recording media including illegally recorded data are distributed, the recording device used for the recording can be specified and can be excluded from the system. An information playback device verifies the validity of the digital signature and public key certificate when reading data, specifies a content recorder, and verifies no falsification in the digital signature and the public key certificate before playing back the data. This structure can efficiently exclude the playback of content recorded by an invalid recording device.
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patent: 11-224461 (1999-08-01), None
Chai Longbit
Learner, David, Littenberg, Krumholz & Mentlik, LLP
Revak Christopher
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