| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio communication system which can actualize safe copyright protection even in a radio environment. SOLUTION: An authenticating and key exchanging procedure of a radio link layer network is carried out between a portable MPEG4 player 101 which sends MPEG4 data whose copyright should be protected and a portable viewer 102 which receives, decodes, and displays the data from the player 101 and when the procedure is successfully followed, an authenticating and key exchanging procedure of DTCP is carried to between the player 101 and viewer 102 by using a cipher communication using a cipher key that the player 101 and viewer 102 shares, and when the authenticating and key exchanging procedure is successfully completed, the data are transferred safely from the player 101 to the viewer 102 by using the cipher communication using the cipher key that the player 101 and viewer 102 shares. |
