ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,549,786, issued on Feb. 10, was assigned to NAGRAVISION SARL (Cheseaux-sur-Lausanne, Switzerland).
"Content protection" was invented by Christian Schwarz (Vuarrens, Switzerland), Andre Nicoulin (Lausanne, Switzerland) and Didier Hunacek (Blonay, Switzerland).
According to the abstract* released by the U.S. Patent & Trademark Office: "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 to...