Free Software Foundation

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=== The four essential freedoms 

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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). Access to the source code is a precondition for this. ◾The freedom to redistribute copies so you can help your neighbor (freedom 2). ◾The freedom to distribute copies of your modified versions to others (freedom 3). 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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