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Free-Open Software = 4 fundamental freedoms

Freedom 0 :
The freedom to run the program, for any purpose

Freedom 1 :
The freedom to study how the program works

Freedom 2 :
The freedom to redistribute copies

Freedom 3 :
The freedom to improve the program, and release your improvements to the public

GNU/GPL (1989 ... ) = 4 freedoms + Copyleft

! Proprietary software !

! Open software !

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