Free Software Foundation

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The Four Essential Freedoms

A program is free software if the program's users have the four essential freedoms:

The freedom to run the program as you wish, for any purpose (freedom 0)

The freedom to study how the program works, and change it so it does your computing as you wish (freedom 1)

The freedom to redistribute copies so you can help your neighbour (freedom 2)

The freedom to distribute copies of your modified versions to others (freedom 3)