| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve transmission of little EMM data to receivers of a particular group. <P>SOLUTION: A scramble broadcast system for transmitting and setting individual contract information to a receiver side hierarchically defines IDs, specifies a reference range of the IDs attached to the individual contract information by means of ID identification, attaches key identification information, to specify a key for encrypting or decrypting the individual contract information, to the individual contract information and transmits the resulting individual contract information to transmit the individual contract information to the receivers in the hierarchical groups. <P>COPYRIGHT: (C)2004,JPO |
