When Digital Research founder Gary Kildall examined PC DOS and found that it duplicated CP/M's programming interface, he wanted to sue IBM, which at the time claimed that PC DOS was its own product.
Cando o fundador de DRI Gary Kildall examinou PC-DOS e atopou que duplicaba a interface de programación de CP/M, tentou demandar a IBM, que nese momento afirmou que PC-DOS era o seu propio produto.