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:
Feb. 02, 2010
Filed:
May. 30, 2003
Tomohiro Yamada, Hyogo, JP;
Tomohiro Yamada, Hyogo, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A content reproducing apparatus includes a CPU. The CPU executes an authentication process with a memory card at a time of starting reproduction. The reproducing apparatus, when succeeding in the authentication process, can obtain from the memory card a decryption key of encrypted music data. Accordingly, by decrypting encrypted content data separately obtained by use of the decryption key, it is possible to reproduce the music data. In such the authentication process, certificate data is utilized in an order which starts from registered identification numbers and, every time failing in the authentication process, is renewed to a next identification number. Consequently, an identification number of certificate data which succeeds in the authentication process is registered and utilized in a next authentication process and the subsequent.