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Title:
COMMUNICATION APPARATUS, SERVER, AND PROGRAM
Document Type and Number:
Japanese Patent JP2009272927
Kind Code:
A
Abstract:

To provide a communication technique for controlling illegal decoding of the encrypted contents even if a bunch of keys including each decoding key for decoding the encrypted contents is disclosed in a contents distribution system.

A contents acquisition part 500 receives each encrypting piece composing contents to be encrypted from at least one of seeders. Moreover, this contents acquisition part 500 decides whether the encrypting piece acquired is an invalid encrypting piece by referring to an invalid piece list acquired by an invalid piece list acquisition part 504. This contents acquisition part 500 further deletes the relevant encrypting piece and acquires an alternative encrypting piece of the relevant encrypting piece when the encrypting piece acquired is decided as the invalid encrypting piece. The invalid piece list acquisition part 504 acquires the invalid piece list from a tracker.


Inventors:
SATO HIDEAKI
MATSUSHITA TATSUYUKI
UMEZAWA KENTARO
MATSUMOTO HIDEKI
KOIKE RYUICHI
KATO HIROSHI
TOYAMA HARUHIKO
KAMIBAYASHI TATSU
ITO SATOSHI
Application Number:
JP2008000122177
Publication Date:
November 19, 2009
Filing Date:
May 08, 2008
Export Citation:
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Assignee:
TOSHIBA CORP
International Classes:
H04L9/08
Attorney, Agent or Firm:
酒井 宏明



 
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