Patent ID: 8385545
Filing Date: 2013-02-26
Classification: H04L

Abstract:
1. A subscriber television system comprising: a plurality of conditional access systems (CASs) configured to each supply a control word to a first encrypter for use by the first encrypter to encrypt a first stream of packets with each of the control words, wherein the plurality of CASs are provided by physical equipment in a head end of the subscriber television system, the physical equipment including a random control word generator for providing the control word, wherein each of the control words is generated from information contained in an entitlement control message and information from authorization information, the authorization information stored in a set-top box in the subscriber television system, wherein the entitlement control message comprises frequently changing decryption information; the first encrypter configured to: wherein the first encrypter comprises a physical component module in the head end comprising the physical equipment; and a first decrypter having a secure micro to receive the special packet and configured to decrypt the second stream of packets using the information in the special packet.