| 摘要 |
The invention concerns a point-to-point transmission environment and aims at making secure the data such that data decrypted by one of the users cannot b e used by another. This is achieved by a secure point-to-point data transmissi on between a management center and a unit connected to said management center, said data comprising a content encrypted by at least one control word, each user unit including at least one decoder/receiver provided with at least one decryption key specific to each user unit. The invention is characterized in that it comprises the following steps: sending a request from the user unit to the management center requesting transmission of a specific content, accompanied by a unique identifier; determining, from a database associated with the management center, the key corresponding to said user unit which ha s sent the request; encrypting the control words with said key corresponding t o said user unit which has sent the request, so as to obtain encrypted control words, and transmitting them to the user unit which has sent the request; an d transmitting said encrypted content to the user unit which has sent the request.
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