Re: [Trisquel-users] Free Software that is not GPL'd

[onpon4]

Permissively licensed software is extremely common. The classic example is X,  
which is under the X11 License. It was adopted as the window system for GNU  
in the 1980s since it's was a perfectly good window system; it wasn't and  
still isn't copyleft, but that's not a good reason to reject it. X is still  
in use today, though it's being replaced by Wayland (which is also  
permissively licensed) in many systems now.

I wouldn't suggest using "GNU GPL" as a shorthand definition for "free/libre  
software". Partly because there are a lot of people who believe that  
definition to be literally true, or more precisely, believe that free/libre  
software is always copylefted. This is wrong.