This is a lax, permissive, and weak free program license that is appropriate with the GPL. In 2010, he was sentenced to a few years' probation for piloting a plane 26 yrs immediately after getting rid of his pilot's license and rigging certificates. We propose that you not use this license for new program that you write, but it is alright to use and strengthen Plan 9 under this license. For even more discussion, see Rea 2001.