აბსტრაქტი. All programs are protected from unauthorized copying if a copy of the program is executed in it, which allows you to check the program itself in order to determine whether it was created in compliance with all the necessary technologies. The program cannot work normally if the copying technology is violated. Thus, legal copying involves some unique copying technology. Any copy or internal file of a protected program must have a "key" - one or several code digits. When checking, the program compares a number of specific features of the working environment with a pre-encoded key and, based on the results of the comparison, forms the corresponding sign. Thus, the creation of a copy of the program is minimal: this copy must provide a dongle ready to work with a real computer in order to be functional.