Electrical computers and digital processing systems: support – Data processing protection using cryptography – By stored data protection
Reexamination Certificate
2007-07-10
2007-07-10
Vu, Kim (Department: 2135)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
By stored data protection
C709S203000, C380S278000
Reexamination Certificate
active
09462615
ABSTRACT:
A contents database in which data of contents enciphered by a C key is stored and provided for a contents server, wherein the contents data enciphered by the C key are enciphered by an M key and sent to a user machine. In the user machine, the contents data enciphered by the C key are stored in a storage device. Upon reproduction, the contents data enciphered by the C key from the storage device are sent to an enciphering/decoding processing unit and decoded and charging is performed in accordance with the C key. A dynamic authenticating code which dynamically changes with the elapse of time is added to the C key.
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Katsumata Yasushi
Min-Jae Han
Nakatsuyama Takashi
Ohbayashi Masayuki
Lerner David Littenberg Krumholz & Mentlik LLP
Truong T. B.
Vu Kim
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