| 摘要 |
PURPOSE:To improve the execution inhibiting capacity of a copying program by providing this copying program execution inhibiting system with a code conversion memory and a reverse conversion program for converting a key code (conversion code) outputted from a keyboard interface into an original input key code. CONSTITUTION:When an illegal user having illegally copied an external software S e.g. and not having a key code conversion unit 5 inputs a command 'COPY', the software S sends a character string 'COPY' to the reverse conversion program P. The program P converts respective characters C, O, P, Y to reverse conversion codes D, P, Q, Z and outputs the converted codes D, P, Q, Z to an execution program P0. Since a completely meaningless character string 'DPQZ' is applied to the program P0 as a command, the program P0 outputs an error display and does not execute the original function. Thus, the utilization of the program by the illegal user can be surely inhibited. |
