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:
Mar. 26, 2024
Filed:
Apr. 24, 2023
Applicant:
Nagravision Sarl, Cheseaux-sur-Lausanne, CH;
Inventors:
Assignee:
NAGRAVISION Sárl, Cheseaux-sur-Lausanne, CH;
Primary Examiner:
Int. Cl.
CPC ...
H04N 21/2347 (2011.01); G06F 21/57 (2013.01); H04L 9/16 (2006.01); H04L 9/32 (2006.01); H04N 7/167 (2011.01); H04N 21/266 (2011.01); H04N 21/418 (2011.01); H04N 21/4405 (2011.01); H04N 21/4623 (2011.01);
U.S. Cl.
CPC ...
H04N 21/2347 (2013.01); G06F 21/57 (2013.01); H04L 9/16 (2013.01); H04L 9/3213 (2013.01); H04N 7/167 (2013.01); H04N 21/26606 (2013.01); H04N 21/26613 (2013.01); H04N 21/4181 (2013.01); H04N 21/4405 (2013.01); H04N 21/4623 (2013.01);
Abstract
Devices, servers, systems and methods for content protection are provided. Disclosed embodiments improve temporal granularity of controlling access to the protected content and increase resilience against attacks attempting to prevent re-evaluation of conditions of access. Enforcement of re-evaluation may be based on the receipt and/or verification of tokens. In some embodiments, re-evaluation is enforced by periodically rendering content keys required for content decryption unuseable and/or clearing content keys already in use.