Patent ID: 7957722

Claim:
Method for reproducing a data file through a mobile user device, the mobile user device having an integrated reproducing device, an identification module for identifying the user device in a mobile radio network and having also biometric recording means or being connected with such biometric recording means over a wireless interface, wherein the method includes the following method steps: the mobile user device recording biometric data of the user using said biometric recording means, the mobile user device registering into the mobile radio network, the mobile user device transmitting the user's recorded biometric data or key data derived therefrom over the mobile radio network to an authentication server, authenticating the user in the authentication server using the transmitted biometric data or the key data derived therefrom, in response to said authenticating, transmitting the data file or a key for opening the data file to the mobile user device over the mobile radio network from a remote server connected with the authentication server, in case a key has been downloaded to open the data file which has been previously encrypted, the data file is decrypted with this key, and reproducing a video or presentation, utilizing the data file, for viewing by the user with the reproducing device integrated in the mobile user device, wherein said video or presentation cannot be viewed on the mobile user device without authenticating the user.