G - Physics – 06 – F
Patent
G - Physics
06
F
G06F 12/14 (2006.01) G06F 1/00 (2006.01) G06F 21/00 (2006.01)
Patent
CA 2371124
A client receives an encrypted content from a content server. The header of the content includes license-identifying information for identifying a license required in utilization of the content. The client requests a license server to transmit a license identified by the license-identifying information. When receiving the request for a license, the license server carries out a charging process before transmitting the license to the client. The client stores the license received from the license server. The stored license serves as a condition for encrypting and playing back the content. As a result, a content can be distributed with a high degree of freedom and only an authorized user is capable of utilizing the content.
Ishiguro Ryuji
Kawakami Itaru
Kuroda Yoshisuke
Tanaka Koichi
Gowling Lafleur Henderson Llp
Sony Corporation
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