| 摘要 |
PURPOSE:To protect surely a program against an external storage device, by inhibiting the writing of a secret program or securing the secret program at the reading of the secret program. CONSTITUTION:A CSAVE instruction 1 to record a program in a tape by adding a proper pass word to the program, a CLOAD instruction 2 to load the program provided with the pass word from the program tape, a PASS instruction to make the program secrete or release the secrecy, and a LIST instruction 4 to display the contents of the program are set up as the program to make the program secrete or release the secrecy. The execution of these instructions makes securing an unprotected program possible, and makes the program read out from the external storage device secrete and inhibit the writing and display of the secret program to the external device. |
