Unauthorized copying has been an ongoing phenomenon that started when high quality, commercially produced software was released for sale. Whether the medium was cassette tape or floppy disk, cracking enthusiasts found a way to duplicate the software and spread it without the permission of the maker. Thriving bootlegging communities were built around the Apple II, Commodore 64, the Atari 400 and Atari 800 line, the ZX Spectrum, the Amiga, and the Atari ST, among other personal computers. Entire networks of BBSes sprang up to traffic illegal software from one user to the next. Machines like the Amiga and the Commodore 64 had an international network, through which software not available on one continent would eventually make its way to every region via bulletin board systems.