[Trisquel-users] Re : Doom/Doom II on Trisquel

[lcerf]

The argument is that the user achieves a work with the manual or the text  
book (unlike with art) and must be allowed to do whatever she wishes with it.  
That includes commercial activities. That is why a license that prohibits  
commercial usage is non-free. More generally, any "do no evil" clause makes a  
license on functional works non-free. The author should not impose her views  
on what is evil and what is not.