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. 05, 2005
Filed:
Dec. 13, 2000
Bin Xu, Sunnyvale, CA (US);
Weijun LI, Sunnyvale, CA (US);
Kyle Smith, San Jose, CA (US);
Dalun Bao, Mountain View, CA (US);
Bin Xu, Sunnyvale, CA (US);
Weijun Li, Sunnyvale, CA (US);
Kyle Smith, San Jose, CA (US);
Dalun Bao, Mountain View, CA (US);
Aladdin Knowledge Systems, Ltd., Tel Aviv, IL;
Abstract
A system for permitting offline content playback and for managing the rights to one or more digital content files within a computer network. The system manages these rights by encrypting the content files to prevent unauthorized access to the files. Encryption is accomplished by using one or more keys which are associated with one or more segments of the content file. These keys enable an authorized user to decrypt and playback the content files at a subsequent time. When the keys are received, a license which specifies the rights of the user regarding the content files, is obtained by the end user system, and verified locally to permit the content playback.