Protection of control programs transmitted over the Internet from a developer to a customer using asymmetric encryption of the program code, which is decrypted by the end user after parameter editing

摘要

A method for transmission of control programs by encryption of control program code (5, 7) in a development system (1) and then transmission of the encrypted code (10, 16) from the first development system to a second development system (3) where the encrypted code is decrypted. The code is decrypted after initial editing of the control system before transfer to a pre-processor (18) and compiler (20). Independent claims are made for a system for transferring control program code over an open network and a corresponding arrangement for commissioning of such a control program system.