METHOD FOR ACCESSING SERVICES BY A USER UNIT

摘要

The invention concerns a method for accessing services by a user unit, said services being a subset of all services broadcast by a management center and comprising at least two services, said subset of services defining a package, each service being simultaneously broadcast and containing audio/video data, the data of a service being encrypted by at least one control word, the method comprising the steps of : -determining in a management center, the package 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 at least one control word for each service of the package for which the user's unit is entitled, said 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 to at least said user unit said message on at least one channel accessible whatever the selected service is.