| 摘要 |
PROBLEM TO BE SOLVED: To pre-pay access qualification to purchase or rent without imposing any surplus load on a certification data generating device side. SOLUTION: A pre-paid purchase ticket T2 is stored in an access ticket storing part 13. Next, (T1 ', n2 ) is inputted to a certification data-imputting part 14. A use condition judging part 15 extracts a corresponding access ticket (t2 , L2 , n2 ), checks whether or not a use condition L2 is fulfilled, and reduces frequency information V, when the use condition is fulfilled. A certification data generating and outputting part 16 calculates certification data R by using auxiliary certification decision (t)2 and the use condition L2 extracted by the use condition decision part 15 and (du) read from a user specific information storing part 11, and outputs T1 . A user performs access to a program in a purchase state or a rent state by using the T1 . |
