Free software is based on the four freedoms. Here they are, as defined by the Free Software Foundation:
[o] The freedom to run the program as you wish, for any purpose.
[o] The freedom to study how the program works, and change it so it does your computing as you wish. Access to the source code is a precondition for this.
[o] The freedom to redistribute copies so you can help others.
[o] The freedom to distribute copies of your modified versions to others. By doing this you can give the whole community a chance to benefit from your changes. Access to the source code is a precondition for this.
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