Program protection system

Abstract

Abstract PURPOSE:To inhibit the use of a copied program by allowing the run of a software program only when coincidence is secured the register code of said program and that of a computer. CONSTITUTION:When a certain software program is loaded to a computer and run, a Di terminal corresponding to the program is checked in an initial processing stage. Then the coincidence of register codes is decided by a register code deciding circuit within a CPU part 1 as long as a state signal is set at 0. When the coincidence of register codes is finally decided, a signal is outputted from a DO terminal to actuate a self-support type relay 3. Thus a positive potential is applied to the Di terminal from a power supply terminal 5 via a resistance R. Then the application of the software program is possible.

Inventors

• 👤 Tomio Chiho
• 👤 千保　富夫

Bibliographic Details