Title:
COMMUNICATION SYSTEM, COMMUNICATION DEVICE, COMMUNICATION METHOD, AND COMPUTER PROGRAM
Document Type and Number:
WIPO Patent Application WO/2012/014566
Kind Code:
A1
Abstract:
Content is transmitted in an appropriate usage range for a user while the number of devices simultaneously transmitting content is limited. A content usage device periodically transmits, by means of a command, a key ID which corresponds to an exchange key. A content provision device holds the corresponding exchange key only for as long as the key ID can be received in each specified reception period. The content provision device discards the corresponding exchange key when the key ID can no longer be periodically received. Thereafter, when a command including the key ID is received, a response including information indicating that the exchange key is invalid is returned.
Inventors:
NAKANO, Takehiko (1-7-1 Konan, Minato-K, Tokyo 75, 〒1080075, JP)
Application Number:
JP2011/062739
Publication Date:
February 02, 2012
Filing Date:
June 02, 2011
Export Citation:
Assignee:
SONY CORPORATION (1-7-1, Konan Minato-K, Tokyo 75, 〒1080075, JP)
ソニー株式会社 (〒75 東京都港区港南１丁目７番１号 Tokyo, 〒1080075, JP)
ソニー株式会社 (〒75 東京都港区港南１丁目７番１号 Tokyo, 〒1080075, JP)
International Classes:
H04L9/08; G06F21/24
Attorney, Agent or Firm:
YAMADA, Eiji et al. (Daido Patent Attorneys Partnership Corporation, KSK Bldg. West 8F 3-25-9, Hatchobori, Chuo-K, Tokyo 32, 〒1040032, JP)
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Claims:
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