CAS is considered as the core unit of complete DTV system. It has two main functions. 

One is cooperating with Scrambler to realize the scrambling of the TS, and the anther

 is to realize the encryption of CW (Control Word/Code Word). At the same time, the

 CAS needs to cooperate with the SMS and receive the authorization management

 information from it.

* With high security which against the potential attacks of the hardware and software

*Support smart online upgrade and multi-layer encryption mixed with the opening and private algorithm

* Support pay by mobile phone SMS

* With easy pay system which reducing the operator's cost