| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform trick play such as content reproduction, fast forward/rewinding without problems in equipment for reproducing contents in which encryption keys are changed at a certain interval for copyright protection. <P>SOLUTION: An amount of information which can avoid much time required for key information acquisition processing and decoding processing is stored in a temporary storage area such as a memory with content information necessary for special reproduction and key information to be necessary for decoding corresponding to the content information as a set. special reproduction is achieved by controlling timing for decoding the information stored in the temporary storage area or providing the decoder with the information. <P>COPYRIGHT: (C)2009,JPO&INPIT |
