reference
The Free Software Foundation (FSF) defines the 'Four Essential Freedoms' of free software as: (0) The freedom to run the program as you wish, for any purpose; (1) The freedom to study how the program works, and change it so it does your computing as you wish (access to source code is a precondition); (2) The freedom to redistribute copies so you can help others; (3) The freedom to distribute copies of your modified versions to others (access to source code is a precondition).

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