Cryptography – Key management – Key distribution
Reexamination Certificate
2000-05-11
2008-03-04
Zia, Syed A. (Department: 2131)
Cryptography
Key management
Key distribution
C380S277000, C713S168000, C713S171000, C726S026000
Reexamination Certificate
active
07340061
ABSTRACT:
In an information processing apparatus, a key management unit forms a judgment as to whether an authentication key owned by an application program is valid or invalid. A content protection unit is controlled based on this determination so that contents are exchanged between the information processing apparatus and the application program. An encryption/decryption unit encrypts a decrypted content by using an encryption key received from a key management unit and outputs the encrypted content to an encrypted-information addition unit. The encrypted-information addition unit adds encrypted information to the encrypted content received from the encryption/decryption unit and outputs the encrypted content with the encrypted information added thereto to the application program. As a result, it is possible to prevent content from being utilized illegally.
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Fujii Asako
Hamada Ichiro
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sony Corporation
Zia Syed A.
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