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Software manufacturers are now using software fingerprinting to stop software piracy. Athey, Day, & Zmud (1987, p. 476) describe Prolok Magic, a software fingerprinting product, as a piece of software that "creates a unique 'fingerprint' on each [media], and encrypts the software program so that it is tied to the presence of this fingerprint." To run the Prolok'ed program, the "related Prolok-formatted [media] is mounted on the default drive" thus requiring the user to have possession of the specially formatted media. Users are able to create backup copies of their Prolok'ed software, however these copies are also Prolok-formatted. This appears to be a good solution, but there are companies who sell software that can remove the Prolok-formatted instructions.