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:
Dec. 05, 2006
Filed:
Jun. 13, 2002
M. Jay Parks, Kirkland, WA (US);
Jonas Fredrik Helin, Järfälla, SE;
M. Jay Parks, Kirkland, WA (US);
Jonas Fredrik Helin, Järfälla, SE;
Microsoft Corporation, Redmond, WA (US);
Abstract
A computing device has a running real-time secure clock adjustable only according to trusted time as received from an external trusted time authority, a time offset within which is stored a time value adjustable by at least one of the user and the trusted time authority, and a time display for displaying a running real-time display time calculated as the trusted time from the secure clock plus the stored time value in the time offset. Reference thus may be made to the secure clock to evaluate a temporal requirement without concern that the user has adjusted the secure clock to subvert the temporal requirement. The computing device sends a request for secure time and the trusted time authority sends same. The computing device receives the secure time, sets the secure clock according to same, and sends confirmation to the trusted time authority that the secure time has been received.