The free software movement is concerned with ethical and social values. Our goal is to win, for computer users, the freedom to cooperate and control your own computing. Therefore, you should have these four essential freedoms for each program you use:

0. To run the program as you wish. 1. To study the source code and change it so the program does what you wish. 2. To redistribute exact copies when you wish, either giving them away or selling them. 3. To distribute copies of your modified versions when you wish.