Data processing: financial – business practice – management – or co – Business processing using cryptography – Usage protection of distributed data files
Reexamination Certificate
2005-03-01
2005-03-01
Trammell, James P. (Department: 3621)
Data processing: financial, business practice, management, or co
Business processing using cryptography
Usage protection of distributed data files
C705S050000, C713S150000, C380S255000
Reexamination Certificate
active
06862582
ABSTRACT:
A data protection system obtains data having a first content on which a first encryption has been performed and a second content on which a second encryption has been performed, the second encryption more difficult to break than the first encryption. A first content decryption unit decrypts the first content, using a first encryption method corresponding to the first encryption of the first content. A second content decryption unit decrypts the second content using a second decryption method that corresponds to the second encryption. The decrypting contents can be executed by a software, and the second content decryption unit can include one of tamperproof hardware and an apparatus that executes tamperproof software.
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Harada Shunji
Kozuka Masayuki
Minami Masataka
Tatebayashi Makoto
Matsushita Electric - Industrial Co., Ltd.
Trammell James P.
Worjloh Jalatee
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