Electrical computers and digital processing systems: support – Data processing protection using cryptography – By stored data protection
Reexamination Certificate
2004-08-12
2008-05-27
Moazzami, Nasser (Department: 2136)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
By stored data protection
C380S277000, C713S150000, C726S026000
Reexamination Certificate
active
07380139
ABSTRACT:
A data communication unit receives encrypted digital data via a network and records the digital data on a primary recording medium. The digital data, having been encrypted in different encryption methods according to the distributers, include attribute information indicating the encryption methods. The encryption method of the digital data is determined and the encrypted data is decrypted by an appropriate decryption unit. Identification information of a secondary recording medium or a playback apparatus is obtained according to whether the secondary recording medium is removable from the playback apparatus. A controller selects an encryption unit among a plurality of encryption units according to the obtained identification information. The selected encryption unit creates an encryption key according to the identification information and re-encrypts the digital data. A recording unit records the digital data on the secondary recording medium. An accounting unit charges according to accounting information in the attribute information.
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Kozuka Masayuki
Minami Masataka
Tagawa Kenji
Baum Ronald
Matsushita Electric - Industrial Co., Ltd.
Moazzami Nasser
Wenderoth , Lind & Ponack, L.L.P.
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