Content distribution system and tracking system

Cryptography – Key management – Key distribution

Reexamination Certificate

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Details

C380S281000, C726S026000

Reexamination Certificate

active

07961887

ABSTRACT:
A content distribution system encrypts a content by using different session keys assigned to user systems, encrypts each of the session keys with a public key corresponding to a decryption key unique to each user system, generates, for a group of user identification information items, header information including the encrypted session keys, and a first vector which corresponds to a session key of the session keys and is assigned to arbitrary user identification information u in the group, the first vector being set such that an inner product of the first vector and a second vector concerning the user identification information u becomes equal to zjuv(where zjis a constant value of a session key sjassigned to the user identification information u, and v is group identification information to the group), and transmits the header information and one of the encrypted contents to the user systems.

REFERENCES:
patent: 2003/0152234 (2003-08-01), Matsushita
patent: 2005/0157878 (2005-07-01), Matsushita
patent: 2007/0180233 (2007-08-01), Matsushita
patent: 1 331 751 (2003-07-01), None
patent: 2000-253459 (2000-09-01), None
patent: 2002-165081 (2002-06-01), None
patent: 2006-19975 (2006-01-01), None
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Matsushita, et al., “Hierarchical Key Assignment for Efficient Public-Key Black-Box Tracing against Self-Defensive Pirates”, Information Processing Society of Japan Technical Report, vol. 1, Jul. 21, 2006, No. 81 pp. 321-328 (w/Abstract).
Office Action from corresponding JP 2007-002658 dated Sep. 24, 2008 (w/translation).

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