Patent ID: 8284935

Claim:
A method for encoding and decoding media data, having the steps: transmitting a request from a subscriber device via a control network to a control server for specifying a set of encoding parameters for control data, the request comprising identification data of the subscriber device, specifying the set of encoding parameters for control data by the control server, comprising a random number, a control data key and an integrity key, the control data key and the integrity key being dependent on the random number and the identification data, generating a media key in dependence on the control data key and the integrity key via the control server, transmitting the media key from the control server to a media server via a core network, transmitting further encoding parameters relating to an encoding algorithm to be used, from the control server via the core network to the media server, the further encoding parameters being negotiated between the subscriber device and the control server, encoding uncoded media data by the media server using the media key for sending via a data network to the subscriber device, and decoding coded media data received via the data network and sent by the subscriber device, by the media server by using the media key.