| 摘要 |
PROBLEM TO BE SOLVED: To provide services for limited users by using distribution media for many unspecified users. SOLUTION: A portable information terminal is provided with an FM multiplex radio broadcast reception part and a communication device for the Internet, and contents are distributed by respective communication methods to unspecified users in readable format and to limited users in unreadable format. In the latter case, a terminal downloads an electronically watermarked image. In a watermark area, a common karaoke code is recorded and the limited users read and send the code to a karaoke machine; and then a karaoke code conversion site on the Internet converts the code into karaoke codes unique to respective karaoke companies and they are reproduced, so that karaoke music that only the limited users can reproduce can be provided. |
