texto : flisol2007 : A Freedom Festival & Free Software and The Matrix

Free Software is a matter of freedom, not price.
Free Software respects four essential freedoms:
0. to run the program for any purpose you wish;
1. to study the source code and change it to do what you wish;
2. to copy the program and distribute the copies when you wish;
3. to publish or distribute a modified version when you wish.