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:
Jan. 08, 2013
Filed:
May. 05, 2010
Oktay Rasizade, Castro Valley, CA (US);
Bahman Qawami, San Jose, CA (US);
Fabrice Jogand-coulomb, San Carlos, CA (US);
Robert C. Chang, Danville, CA (US);
Farshid Sabet-sharghi, Los Altos Hills, CT (US);
Oktay Rasizade, Castro Valley, CA (US);
Bahman Qawami, San Jose, CA (US);
Fabrice Jogand-Coulomb, San Carlos, CA (US);
Robert C. Chang, Danville, CA (US);
Farshid Sabet-Sharghi, Los Altos Hills, CT (US);
SanDisk Technologies Inc., Plano, TX (US);
Abstract
One or more rights objects (RO) files may be used for storing RO's preferably in the protected area available only to authenticated users. A RO navigation file is stored preferably in an unprotected public area containing status bits, where each status bit identifies whether a location in a RO file contains a valid RO or not. Preferably, there is a one-to-one correspondence between the location for a RO in a RO file and a location in the RO navigation file for the status bit which identifies whether its corresponding location in the RO file contains a valid RO or not. Whether a particular location in a RO file contains a valid RO or not can be found by checking its corresponding status bit in the RO navigation file. By finding out whether a particular location in a RO file contains a valid RO or not in this manner, it is possible to delete ROs without having to go through an authentication process. The process of finding an empty slot in the RO file for storing a new RO is also simplified. This greatly increases the efficiency of RO management. A similar system may be used for management of content encryption/encryption keys for protecting content files.