| 摘要 |
PURPOSE:To inhibit the execution of a copied program by writing-in year, month, day, hour, minute and second, counted by the timer of a hardware, in a program and a RAM, as the inherent information of the program to be read-out. CONSTITUTION:When an inputting is started, the year, month day, hour, minute and second of a hardware timer 13 are read, and stored as the value of random numbers. An identifier R to show a program protect information in a back up RAM 14, and the obtained and above-mentioned random number value are registered in the back up RAM 14, and at the same time, a program protect (PP) register information area is cleared. After a register information corresponding to a program number concerned in the back up RAM 14 is registered, a PP medium inherent information is inputted, and when the random number value in the back up RAM 14 does not coincide with the random number value in the program product medium inherent information, the execution of the program product concerned is inhibited. |
