Abstract: The invention relates to a method for decrypting encrypted broadband data by one or more authorized users comprising the following steps: provision of the encrypted broadband data (10) for a plurality of users; provision of encrypted or non-encrypted key data (30), which is of a comparatively narrower band than the broadband data (10) and which is personalized for one or more authorized users, exclusively in a decryption unit (40), said narrow-band key data (30) being held in the decryption unit (40) in a form that is not accessible to the authorized user; at least partial decryption of the encrypted broadband data (10) in the decryption unit (40) in order to output a broadband data stream (70) that is at least partially decrypted; or generation of broadband key information (30?) from the narrow-band key information (30) in the decryption unit (40) for the subsequent decryption of the encrypted broadband data (10).

Abstract: The invention relates to a method for decrypting encrypted broadband data by one or more authorised users comprising the following steps: provision of the encrypted broadband data (10) for a plurality of users; provision of encrypted or non-encrypted key data (30), which is of a comparatively narrower band than the broadband data (10) and which is personalised for one or more authorised users, exclusively in a decryption unit (40), said narrow-band key data (30) being held in the decryption unit (40) in a form that is not accessible to the authorised user; at least partial decryption of the encrypted broadband data (10) in the decryption unit (40) in order to output a broadband data stream (70) that is at least partially decrypted; or generation of broadband key information (30?) from the narrow-band key information (30) in the decryption unit (40) for the subsequent decryption of the encrypted broadband data (10).