The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 08, 2012
Filed:
Dec. 12, 2008
Kentaro Umesawa, Kanagawa, JP;
Ryuiti Koike, Tokyo, JP;
Hideki Matsumoto, Kanagawa, JP;
Tatsuyuki Matsushita, Tokyo, JP;
Taku Kato, Kanagawa, JP;
Haruhiko Toyama, Kanagawa, JP;
Hideaki Sato, Kanagawa, JP;
Toru Kambayashi, Kanagawa, JP;
Satoshi Ito, Tokyo, JP;
Kentaro Umesawa, Kanagawa, JP;
Ryuiti Koike, Tokyo, JP;
Hideki Matsumoto, Kanagawa, JP;
Tatsuyuki Matsushita, Tokyo, JP;
Taku Kato, Kanagawa, JP;
Haruhiko Toyama, Kanagawa, JP;
Hideaki Sato, Kanagawa, JP;
Toru Kambayashi, Kanagawa, JP;
Satoshi Ito, Tokyo, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A communication apparatus stores encrypted pieces having plural pieces as a part of a content encrypted, and number of transmission times. At least one first piece is encrypted by plural different encryption keys. The communication apparatus selects as priority pieces plural encrypted pieces corresponding to at least one first piece among the first pieces, based on number of untransmitted encrypted pieces of which number of transmission times is zero among plural encrypted pieces of which first piece is encrypted, and stores priority piece information specifying the priority piece. When a piece request is received from other communication apparatus, the communication apparatus determines an encrypted piece to be transmitted, based on priority piece information, and transmits the encrypted piece to the other communication apparatus.