| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent such a period when content information acquisition becomes impossible, if the reception of a broadcast wave different from the broadcast wave under reception is started after the key information for decoding the content information is updated in each broadcast wave. <P>SOLUTION: When the key information about a broadcast wave being received by a broadcast receiver 100 is updated, the broadcast receiver receives a broadcast wave different from that broadcast wave through a broadcast receiver 110, and updates the key information about a broadcast wave other than the broadcast wave which is received by the broadcast receiver. <P>COPYRIGHT: (C)2010,JPO&INPIT |
