Terminal device, content recording system, title key recording method, and computer program

Abstract

A terminal devicethat is connected to a key distribution devicevia a network, and in which a recording medium deviceis mounted, the key distribution devicebeing for distributing a title key necessary for use of content, the recording medium devicebeing for storing therein the content and the title key. The recording medium deviceand the key distribution deviceperform mutual authentication and share shared keys that are identical to each other. The terminal devicecomprises: a reception unit that receives an encrypted title key from the key distribution device, the encrypted title key being the title key encrypted with the shared key of the key distribution device; and a transfer unitthat transmits the encrypted title key to the recording medium device. Upon completion of the mutual authentication between the recording medium deviceand the key distribution device, the reception unit and the transfer unitrefrain from any involvement with communication data except reception and transmission thereof, the communication data being exchanged between the recording medium deviceand the key distribution devicewith use of the shared keys.