CONTENTS SHARING MANAGEMENT SYSTEM AND CONTENTS PROTECTING METHOD AND RECORDING MEDIUM WHERE THE METHOD IS RECORDED

PROBLEM TO BE SOLVED: To obtain a contents sharing management system allowing users to execute shared use such as the duplication of contents within the range of proper right and a contents protecting method. SOLUTION: At the time of going to use contents in a contents using part 1, whether the hardware is proper or not, and whether the user is authorized or not is authenticated by a hardware authenticating part 2 and a user authenticating part 3 respectively at need in order to check whether the user condition is fulfilled or not. At the time of judging any one or both of the hardware and the user to be improper, a use condition judging part 4 judges whether or not the new permission of the hardware or the user is admitted as the user condition, and when they are permitted, a user condition updating part 5 updates the use condition based on one or both of the present hardware information and the user information. Thus, the contents sharing different hardware can be realized based on the proper use condition.