| 摘要 |
PROBLEM TO BE SOLVED: To provide a hardly tapped transmission system suitable for flexibly deciding a viewing charge. SOLUTION: As this transmission method, already ciphered data are transmitted to a reception side (106), the ciphering is changed by a prescribed unit (105) and recording corresponding to the request of information relating to the decoding of the already ciphered data from the reception side is performed (109). Also, as this reception method, the already ciphered data are received from a transmission side (305), the information relating to the decoding of the already ciphered data is requested to the transmission side (303) and the already ciphered data are decoded by using the obtained information relating to the decoding (304). |
