| 摘要 |
PROBLEM TO BE SOLVED: To reliably switch a program to another program of a different contract. SOLUTION: A scramble control means 110 takes a schedule of programs or the like as the input and successively outputs a scramble key and a scramble key application time to an encryption means 14 in accordance with the schedule and outputs deciphering information and deciphering information application time to a deciphering information sending means 120. At the time of program switching, the scramble key application time and the deciphering information application time are so adjusted and set that dispersion of processing may be corrected. Deciphering information is enciphered by the deciphering information sending means 120 and is sent to a multiplexing means 130 in accordance with the deciphering information application time. The multiplexing means 130 multiplexes various information related to the program to generate a broadcast signal. The broadcast signal is enciphered in the enciphering means 140 in accordance with the scramble key application time by using the scramble key. The broadcast signal and its deciphering information which are generated and enciphered in this manner are sent. |
