Copyright protection system, encryption device, decryption...

Details Copyright protection system, encryption device, decryption... Copyright protection system, encryption device, decryption...

2001-04-06

2009-11-10

Zand, Kambiz (Department: 2439)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

By stored data protection

Reexamination Certificate

active

07617402

ABSTRACT:
A copyright protection system comprises an encryption device and a decryption device. Cryptographic communication is performed between the encryption device and the decryption device using a contents key. The encryption device includes a contents storage section for storing contents, a first contents key generation section for generating the contents key based on a second decryption limitation obtained by updating a first decryption limitation, and a first encryption section for encrypting the contents using the contents key and outputting the encrypted contents. The decryption device includes a second contents key generation section for generating the contents key from the second decryption limitation, and a first decryption section for decrypting the encrypted contents using the contents key generated by the second contents key generation section.

REFERENCES:
patent: 4071693 (1978-01-01), Frutiger
patent: 6550011 (2003-04-01), Sims, III
patent: 6728379 (2004-04-01), Ishibashi et al.
patent: 6792539 (2004-09-01), Oishi et al.
patent: 6832319 (2004-12-01), Bell et al.
patent: 0 800 312 (1997-08-01), None
patent: 0 878 796 (1998-11-01), None
patent: 0 994 475 (2000-04-01), None
patent: 07-131449 (1992-05-01), None

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