| 摘要 |
PURPOSE:To invalidate a program whose available period already expired by checking automatically the expiring date of the program based on the register information on the expiring date and erasing the program if its available period already expired. CONSTITUTION:When an intra-system registered program 4 is started, the program 4 calls out a check means 6. The means 6 checks whether the expiring date of the program 4 already passed or not based on the register information on the expiring date stored in a storage means 8. If the expiring date does not pass yet, the run of the program 4 is granted. Meanwhile a stop means 5 is called out if the expiring date already passes. Thus the means 5 destroys the program 4 to prevent the run of the program 4 hereafter. As a result, a program whose available period already expired is not available thereafter. |
