ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,750,208, issued on Sept. 29, was assigned to Comcast Cable Communications LLC (Philadelphia).

"Managing encryption keys for content" was invented by Kyong Park (Philadelphia), Nikola Kolev (Devon, Pa.) and Jason Burgess (Highlands Ranch, Colo.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed are systems and methods for encryption key management. Content items, or portions thereof, can be assigned to a plurality of partitions. Each of the plurality of partitions can correspond to a timeframe of encryption key rotation. Cache control can be applied to manifests and/or content based on the timeframe of encryption key rotation."

The patent was fil...