2. The system of claim 1 , further comprising: a second encrypter; a selector configured to select packets from the first stream of packets for encryption with the first encrypter using a control word from a first encryption CAS, and to select packets from the first stream of packets for encryption with the second encrypter with the control word from a second encryption CAS; and a multiplexer configured to multiplex packets encrypted with the control word from the first encryption CAS and packets encrypted with the control word from the second encryption CAS.
2. The system of claim 1 , further comprising: a second encrypter; a selector configured to select packets from the first stream of packets for encryption with the first encrypter using a control word from a first encryption CAS, and to select packets from the first stream of packets for encryption with the second encrypter with the control word from a second encryption CAS; and a multiplexer configured to multiplex packets encrypted with the control word from the first encryption CAS and packets encrypted with the control word from the second encryption CAS. 3. The system of claim 2 , wherein the first encrypter and the second encrypter perform their respective encryptions in parallel.