| 摘要 |
The aim of this invention is to propose a method allowing specific services to be received by a user A from a broadcaster in which this user is not initialised. So, this invention refers to an access control method of a broadcast by a broadcaster B of specific services ciphered by control-words CW, the access rights DB to these services being managed by an access control centre CAB, these rights DB, having a transmission key TB that allows the control-words CW to be deciphered, this broadcast being received by a mobile apparatus A connected to a security unit SM which includes a unique identification number UA and a security key KA for protected information transmission, this apparatus A being linked to a telephony operator B and initially registered in another access control centre CAA, this method consists of: transmitting by the provider B a description of services on the apparatus A, transmitting by the apparatus A, the request to subscribe to this service to the operator B, the request to this service and the unique identification number UA originating from the apparatus A, transmitting this request to the access control centre CAB, transmitting through the access control centre CAB the access right DB and the unique number UA to the access control centre CAA, composing at the access control centre CAA a message EMM containing the access right DB ciphered by the security key KA, transmitting to the operator B this message so that it be transmitted to the apparatus A, decoding this message EMM by the security unit SM by means of the security key KA and storing the transmission key TB and the access right DB to the service in the security unit SM, deciphering the control-words CW of the specific service in the security unit SM thanks to the transmission key TB. |
