| 摘要 |
PROBLEM TO BE SOLVED: To surely and easily charge for the use of digital contents. SOLUTION: A server device 16 generates contents and supplies them to a client device 10, and the device 16 records billing data, where discrimination data, the frequency, etc., are recorded, in an IC card when receiving payment of the price for the use of contents. This IC card is inserted to a card reader of the client device 10. The client device 10 takes out and compares discrimination data, etc., from the IC card and contents; and if they coincide with each other, padding or detection processing of a digital watermark for contents is performed, and billing processing according to the use of contents like the frequency in use or the time of use is performed, and contents are submitted to user's use.
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