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. 10, 2008
Filed:
Jun. 01, 2004
Guillermo Lao, Torrance, CA (US);
Manuel Ham, Downey, CA (US);
Eddie J Chen, Rancho Palos Verdes, CA (US);
Thomas Demartini, Culver City, CA (US);
Charles P Gilliam, Darien, CT (US);
Michael Raley, Downey, CA (US);
Bijan Tadayon, Germantown, MD (US);
Xin Wang, Torrance, CA (US);
Guillermo Lao, Torrance, CA (US);
Manuel Ham, Downey, CA (US);
Eddie J Chen, Rancho Palos Verdes, CA (US);
Thomas DeMartini, Culver City, CA (US);
Charles P Gilliam, Darien, CT (US);
Michael Raley, Downey, CA (US);
Bijan Tadayon, Germantown, MD (US);
Xin Wang, Torrance, CA (US);
ContentGuard Holdings, Inc., Wilmington, DE (US);
Abstract
A method, system, and computer program product for exercising rights based on determining trust in an issuance of a rights expression, including issuing rights expressions by a chain of servers, forming a chain of rights expressions issued from server to server and finally from the last server to a client, such that each of the rights expressions except the last includes a specification of rights for the next server to issue the rights in the next rights expression; determining whether or not each of the servers has a right to issue the respective rights expression; exercising by the client the rights expressed in the last rights expression as being trusted, if it is determined that each of the servers had a right to issue the respective rights expression; and not exercising by the client the rights expressed in the last rights expression as not being trusted, if it is determined that at least one of the servers did not have the right to issue the respective rights expression.