Bill Gates fell into it. He acquired DOS from the guy who wrote it. Then Gates took it to IBM, who thought that the PC was a toy (hence the cassette recorder storage interface on the first PC), so IBM wasn't too worried about who owned the rights to the operating system, nor did they do anything to protect their design of the IBM-PC, thus making the PC the standard (since everyone could clone it) and at the same time, making PC-DOS/MS-DOS the standard/monopoly and Bill Gates a "genius" -- all based on buying someone else's software for peanuts and having IBM turn it into a monopoly for him. Real genius...