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:
Aug. 07, 2012
Filed:
Oct. 22, 2010
Marc E. Strohwig, Walnut Creek, CA (US);
Yoji Kawamoto, Tokyo, JP;
Motohiko Nagano, Tokyo, JP;
Pierre Chavanne, Davis, CA (US);
Norifumi Goto, Tokyo, JP;
Oscar H. Steele, Iii, Sunnyvale, CA (US);
Eric John Swenson, Soquel, CA (US);
Marc E. Strohwig, Walnut Creek, CA (US);
Yoji Kawamoto, Tokyo, JP;
Motohiko Nagano, Tokyo, JP;
Pierre Chavanne, Davis, CA (US);
Norifumi Goto, Tokyo, JP;
Oscar H. Steele, III, Sunnyvale, CA (US);
Eric John Swenson, Soquel, CA (US);
Sony Corporation, Tokyo, JP;
Sony Electronics Inc., Park Ridge, NJ (US);
Abstract
A method for monitoring time so that the use of protected content can be controlled includes receiving a trusted time value from a trusted authority external to a client device. When the client is no longer in communication with the trusted authority, the previously-received trusted time value is updated by use of the client's operating system counter so that a calculated trusted time value is derived for content license evaluation purposes.