8. The system of claim 1 , further comprising: a first encryption module; a second encryption module, wherein a first control word from a first encryption CAS is supplied to a first encryption module for encrypting the first stream of packets to produce a first encrypted stream of packets and a second control word from a second encryption CAS is supplied to a second encryption module for encrypting the first encrypted stream of packets to produce a second encrypted stream of packets.
8. The system of claim 1 , further comprising: a first encryption module; a second encryption module, wherein a first control word from a first encryption CAS is supplied to a first encryption module for encrypting the first stream of packets to produce a first encrypted stream of packets and a second control word from a second encryption CAS is supplied to a second encryption module for encrypting the first encrypted stream of packets to produce a second encrypted stream of packets. 9. The system of claim 8 , further comprising: a first decryption module; a second decryption module, wherein a first control word from a first decryption CAS is supplied to a first decryption module for decrypting the second encrypted stream packets to produce a first decrypted stream of packets and a second control word from a second decryption CAS is supplied to a second decryption module for decrypting the first decrypted stream of packets to produce a clear stream of packets.