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:
Jul. 21, 2009
Filed:
Jul. 05, 2005
Thomas Alexander Bellwood, Austin, TX (US);
Robert Bryant Chumbley, Austin, TX (US);
Matt Francis Rutkowski, Pflugerville, TX (US);
Alexander H. Tarpinian, Austin, TX (US);
Thomas Alexander Bellwood, Austin, TX (US);
Robert Bryant Chumbley, Austin, TX (US);
Matt Francis Rutkowski, Pflugerville, TX (US);
Alexander H. Tarpinian, Austin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Provided is a method for enabling a device without a secure clock to make a determination on the expiration of encrypted content. When the device receives content, the device also receives the content provider's policy on access. This information provides an ATI in UTI units which is to be associated with the content for the purpose of managing the content's expiration. The ATI is converted to the device's DTI units and the DTI is then used to control the availability of the content for decryption and use. The claimed subject matter permits the existence of tolerance, determined by content policy, in the conversion between UTI and the DTI, as well as in the depletion of the ATI. To move or copy content which has an associated remaining ATI, the device converts the ATI into UTI units and provides converted ATI to the target device in conjunction with the associated content.