| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To make contract change easily. <P>SOLUTION: The contract change information, such a channel number wanted to make a new flat contract, is input, and when it is reserved in an EEPROM 24 of a security module 9, a decoder 8 transmits the contract change information to a transmission-side system. Whereby the transmission side system transmits separate information to the security module 9 making the new flat contract. In a first decoder 23, a contract key is extracted from the separate information on the basis of a contract key, and in a second decoder 22, a scramble key is extracted from the program information on the basis of the contract key and is supplied to a descrambler 21, and the predetermined program of the channel making the flat contract is descrambled. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
