| 摘要 |
PURPOSE:To prevent a program to be used by a device other than a specified one by reading out the program only when the device coincides with device discriminating information previously registered in an external storage medium. CONSTITUTION:A system forming program 9 stores a random number of eight digits generated from a random number generating part 3 at the formation of the system in an area 5. The value becomes the discrimination number of a processor. The information can be used only by the system forming program 9, and once the information is set up, the information may not be changed. At the registration of provided software, the system forming program stores the discriminating information stored in the area 5 in a discriminating information setting area 7 of an external storage medium 6. An operating system 10 compares the discriminating information of the area 5 with the information of the medium 6, and only at the time of coincidence, reads out instruction data. |
