Patent ID: 7634223

Claim:
A method for distributing subscription keys associated with a broadcast-multicast flow comprising: conveying a first at least one subscription key associated with a broadcast-multicast flow to a first set of mobile stations; and conveying a second at least one subscription key associated with the broadcast-multicast flow to a second set of mobile stations, wherein the second at least one subscription key is different than the first at least one subscription key, the second set of mobile stations is different than the first set of mobile stations, the first at least one subscription key and the second at least one subscription key are each used to encrypt the broadcast-multicast flow, the first at least one subscription key is used to create a first encrypted version of the broadcast-multicast flow, the second at least one subscription key is used to create a second encrypted version of the broadcast-multicast flow that is different than the first encrypted version, the first set of mobile stations comprises only subscribers to the broadcast-multicast flow, the second set of mobile stations comprises non-subscribers to the broadcast-multicast flow, and neither the first encrypted version of the broadcast-multicast flow nor the second encrypted version of the broadcast-multicast flow can be viewed by mobile stations not in possession of the first at least one subscription key or the second at least one subscription key.