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:
Jun. 29, 2010
Filed:
Oct. 20, 2004
Applicant:
Hideyoshi Wakimoto, Saitama, JP;
Inventor:
Hideyoshi Wakimoto, Saitama, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04K 1/00 (2006.01); H04L 9/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A license corresponding to digital content includes reliable reference date/time information. A content playback apparatus includes a reference-date/time-information storage unit for storing the reference date/time information. The reference-date/time-information storage unit is updated to maintain the reference date/time information at the latest version. When the digital content is to be played back, the system date/time of the content playback apparatus is compared with the reference date/time to validate the system date/time.