Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2000-08-18
2009-12-22
Chen, Shin-Hon (Department: 2431)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S175000, C713S158000, C713S165000, C726S002000, C726S003000, C726S004000, C726S005000, C709S223000, C709S224000, C709S225000, C709S226000, C709S227000, C709S228000, C709S229000
Reexamination Certificate
active
07636843
ABSTRACT:
A security module is provided in a data recording medium, data to be written to the data recording medium is encrypted with an content key different from one data to another, and the content key is safely stored in the security module. Also, the security module makes a mutual authentication using the public-key encryption technology with a drive unit to check that the counterpart is an authorized (licensed) unit, and then gives the content key to the counterpart, thereby preventing data from being leaked to any illegal (unlicensed) unit. Thus, it is possible to prevent copyrighted data such as movie, music, etc. from being copied illegally (against the wish of the copyrighter of the data).
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Asano Tomoyuki
Osawa Yoshitomo
Chen Shin-Hon
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Sony Corporation
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