Cryptography – Video cryptography – Copy protection or prevention
Reexamination Certificate
2001-01-29
2009-02-17
Vu, Kim (Department: 2135)
Cryptography
Video cryptography
Copy protection or prevention
C380S200000, C380S202000, C380S203000, C380S281000, C380S286000, C726S026000, C726S031000, C726S032000, C713S189000, C713S193000
Reexamination Certificate
active
07492895
ABSTRACT:
Even though data transmitted between a data processing apparatus and disc recording and/or reproducing apparatus is monitored, copying the data is effectively prevented and the data can be protected. A write ID generator20of a disc recording and/or reproducing apparatus10generates independent write ID for each recording of data, and transmits the write ID to an encryptor102of a data processing apparatus100. The encryptor102encrypts contents ID to be used for key information for encrypted contents data and data control information to restrict or prohibit copy by the use of an encrypting key based on the write ID. The encrypted data are transmitted to an encryptor24of the disc recording and/or reproducing apparatus10via an I/F101and I/F19, and encrypted along with the write ID by the use of an encrypting key based on disc ID, and recorded to a disc30.
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Dada Beemnet W
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sony Corporation
Vu Kim
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