| 摘要 |
The invention concerns a method for accessing services by a user unit, each service being simultaneously broadcast and containing audio/video data, at least one service defining a product, the data of each product being encrypted by a plurality of control words, the method comprising the steps of :
- determining in a management center, the products a user unit is entitled to access to;
- determining in said management center a unique key pertaining to said user unit;
- forming a message containing, for each product for which the user's unit is entitled, at least one control words, said at least one control word being secured by the key pertaining to said user unit so that said key must be used to obtain the control word;
- transmitting said message to at least said user unit on a channel that is independent from the services. |
