Although the model was developed for export purposes (the standard pistol cartridge of the Czechoslovak armed forces was the Soviet 7.62×25mm Tokarev, which was later replaced with the Warsaw Pact standard 9mm Makarov pistol cartridge), Koucký's domestic patents regarding the design were classified as "secret patents". Effectively, nobody could learn about their existence, but also nobody could register the same design in Czechoslovakia. At the same time Koucký as well as the company were prohibited from filing for patent protection abroad. Consequently, a large number of other manufacturers began offering pistols based on CZ 75 design (see Clones, copies, and variants by other manufacturers).