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:
Sep. 17, 2013
Filed:
Oct. 31, 2001
Kenji Yoshino, Tokyo, JP;
Yoshihito Ishibashi, Tokyo, JP;
Toru Akishita, Chiba, JP;
Taizo Shirai, Tokyo, JP;
Makoto Oka, Chiba, JP;
Masaharu Yoshimori, Tokyo, JP;
Kenji Yoshino, Tokyo, JP;
Yoshihito Ishibashi, Tokyo, JP;
Toru Akishita, Chiba, JP;
Taizo Shirai, Tokyo, JP;
Makoto Oka, Chiba, JP;
Masaharu Yoshimori, Tokyo, JP;
Abstract
In a content delivery system, delivery of content and charging the fee of the content are performed and managed in a highly secure and effective fashion. If a content-purchasing request is transmitted from a user device to a shop server, a charging process is performed. A user device authentication server, which manages content delivery, converts an encrypted content key KpDAS(Kc) encrypted using a public key of the user device authentication server (DAS) into an encrypted content key KpDEV(Kc) encrypted using a public key KpDEV of the user device. If the charging process is successfully completed, the shop server transmits, to the user device, the encrypted content key KpDEV(Kc).