See also the http://en.wikipedia.org/wiki/Unix_wars http://en.wikipedia.org/wiki/Unix_wars, during which the industry mostly lost a decade of work entombed in p

See also the http://en.wikipedia.org/wiki/Unix_wars http://en.wikipedia.org/wiki/Unix_wars, during which the industry mostly lost a decade of work entombed in proprietary forks. Tit-for-tat has better survival characteristics, and the GPL is no exception.