"What exactly does it mean when Richard Stallman says
that the Creative Commons' Attribution-ShareAlike license has a
"Weak Copyleft"? Why exactly is it that "Freeware" and "Non-Free
Software" mean the same thing, while "Free Software" is something
else entirely? And what is this business with "Free Beer", and
where can I get some? If you've asked yourself these questions,
this column is for you.
"There's a great deal of jargon surrounding the various cultures
and ideas around software freedom. I'm going to take you on a brief
tour to try to make some sense out of the language. Each set of
terms arises from a particular philosophy and movement of people,
so it'll also be necessary to introduce some of those
movements."