The Patent Trial and Appeal Board determined that challenged claims of Ericsson AB’s patent directed to managing encryption key rotation and secure key distribution in over-the-top content delivery are unpatentable as obvious over prior art, in an inter partes review by Google LLC and Lenovo (United States) Inc. The board said that the challenged claims are obvious over various combinations of prior art, including prior art directed to offering free preview of a program to client computers in a multicasting system, that describes a multicast distribution system with a content server and a key management server, and directed to streaming ...
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