| 摘要 |
Method to descramble a digital broadcast transport stream (10) received, from a broadcaster (20) through a satellite, terrestrial or cable network (55), by an hybrid multimedia unit (30) connectable to a server (40) through an IP-connection (45) provided with a return path (43). The transport stream (10) comprising scrambled content packets (15) and conditional access messages (12).The method comprising the steps of:
- authentication of the multimedia unit (30) by the server (40), if the authentication fails, then prevent any further processing by the server (40) of conditional access messages (12) coming from any unauthenticated multimedia unit,
- establishing a secure session between the authenticated multimedia unit (30) and the server (40) for transferring data,
- sending said conditional access messages (12) from the authenticated multimedia unit to the server through said return path (43) without having previously extracted said control data (13),
- verifying the validity of access rights allocated to the multimedia unit,
- extracting the control data (13) from the conditional access messages (12) by the server (40),
- sending the control data (13) from the server (40) towards the authenticated multimedia unit (30) through said IP-connection (45) under said secured session,
- using the control data (13) by the authenticated multimedia unit (40) in order to descramble the content packets (15). |
