Method of protecting computer programs from illegal use

摘要

For protecting computer programs from illegal use, known methods such as copy protection and linkage of programs with computer components have been unsuccessful. They have disadvantages such as incompatibility, expensive modifications, difficult handling or failure. The new method permits copying of programs without restriction. The protection is in the combination of the program with a physical key. The medium is a diskette, which has mechanical modifications, which are decoded using a diskette station. The program to be protected can be started, after the user has been authorised, only by inserting the key diskette. It is also possible to record the program start on the key diskette, to prevent other starts of the program on other devices. The mechanical modifications are unusable sectors, the position of which defines the key. Key diskettes can be manufactured without great cost, but cannot be reproduced without considerable mechanical cost. The security method is particularly suitable for programs for personal computers or stand-alone computer systems. No additional equipment is necessary, since diskette drives are standard on personal computers. However, the method can be used anywhere where a diskette station can be connected.