Patent ID: 7900041
Filing Date: 2011-03-01
Classification: H04N

Abstract:
1. A system for managing access by a set top box (STB) to multimedia content from at least one server, said system being contained in said set top box, said system comprising: at least one encryption module for encrypting and decrypting communications between said STB and said at least one server; a key management module for managing keys received and/or sent to said at least one server, each of said keys being encrypted by said at least one encryption module prior to said keys being sent and/or stored; a subscriber management module for managing said STB's registration with and authentication by said at least one server, said subscriber management module causing said key management module to transmit and/or receive keys to or from said at least one server; and a data storage module for managing storage of data on said STB, said data including said keys, said data being encrypted by said at least one encryption module prior to being stored wherein said subscriber management module is configured to receive authentication requests from said server, both at regular intervals and at randomly chosen times, said authentication requests causing said subscriber management module to uplink to said server, to generate a changeable key based on a key previously received from the server, to authenticate to said server using the changeable key, and to obtain a download from the server necessary to display said content, said download preventing cloned STB's from being able to display said content, even if the STB has previously obtained a key, by including at least one key which the server periodically changes.