HISTORY ACCUMULATION DEVICE, VERIFICATION DEVICE, AND ELECTRONIC RIGHT DISTRIBUTION SYSTEM

摘要

PROBLEM TO BE SOLVED: To reliably check the number of utilized times of an electronic right utilizable a fixed number of times on an off-line basis and to safely erase unnecessary data.;SOLUTION: Out of the history data including an effective period, a service ID, and the number of accumulation times stored in a history accumulating section 17, only the time-expired history data can be erased by a history erasing section 16. The data D0 when the history erasing section 16 has previously erased the history data is stored in a merely incremental counter section 14. When a history recording section 12 receives a history record request including the effective period D and the service ID via a connecting section 11, it compares D with the data D0 of the counter section 14 and terminates the operation if D is smaller, thereby prevents such fraud that the same history data are recorded after the history data are erased, with the data set forward, and prevents the history accumulating section 17 from becoming full with data.;COPYRIGHT: (C)2002,JPO