A system for giving run authorization to a program installed on a computer, comprising a checking unit having a receiving device and, at least partially, forms part of the computer or is linked with the latter via a data link, and a device which is transportable separately from the computer and from the checking unit and connectable to the receiving device within a predetermined distance therefrom by a wireless link through which an identification code contained in said device is transmitted to the checking unit, said checking unit comparing the transmitted identification code with a reference code and giving the run authorization, if both codes are identical.