As it possesses contents circulation manner and

摘要

PROBLEM TO BE SOLVED: To ensure free copying and redistribution of contents, dispense with charging process for each delivery of contents and enable peer-to-peer content distribution.;SOLUTION: A delivery device 200 delivers contents to which it adds an encrypted hash value. A reproduction device 200 decodes the encrypted hash value to check the hash value, and if concordance is found, reproduces the contents, holds a use record of each content piece and transmits the use record to a management device 100 at given timing. The management device 100 totalizes receipt information from users to manage total receipts, totalizes the use records to calculate an audience rating of each content piece, and computes a reward to each content author according to the audience rating and the total receipts to distribute it to each author.;COPYRIGHT: (C)2003,JPO