| 摘要 |
PURPOSE:To protect surely a program by providing a means inhibiting start of an extracting means attended with execution of a program and a means displaying a program list to attain display of the program list in any case. CONSTITUTION:An external storage device EM is connected to a coding/decoding device COD of a CPU by a processor of a program protection system, and a protection device PROTECT is connected between a control device CTL and the device COD. Further, and extracting device LOAD is connected between the device PROTECT and the COD and a protection release device RLS is connected between the device CTL ad the PROTECT. Moreover, a display device LIST is conncted between the device PROTECT and a display DPY, and an initial set device NEW, an extraction execution device RUN and a saving device SAVE or the like are provided between the device CTL and an internal storage device MM. The device PROTECT controls the device LOAD to attain the display of the program list in any case thereby protecting the program. |
