BusinessWeek: Keeping Free Software Free

“In 1989, in a very different world from today’s, I wrote the
first version of the GNU General Public License, a license that
gives computer users freedom. The GNU GPL, of all the free software
licenses, is the one that most fully embodies the values and aims
of the free software movement by ensuring four fundamental freedoms
for every user. These are freedoms: 1) to run the program as you
wish, 2) to study the source code and change it to do what you
wish, 3) to make and distribute copies when you wish, and 4) to
distribute modified versions when you wish…”

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