Free software
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Free software, as defined by the Free Software Foundation, is software which can be used, copied, studied, modified and redistributed with little or no restriction. Thus, software is free software if its source code (the human-readable form of software) is available with a software licence which grants recipients these permissions, or if the source code is in the public domain.
The antonym of free software is proprietary software. Free software is not to be confused with "Freeware", which is software made available free of charge. Freeware may or may not be proprietary.
Free software was defined in 1983. Some alternative terms for free software came into common usage from the late 90s onward, they include "open-source software", "software libre", "FLOSS", and "FOSS".
Free software can be sold and used in commerce. Although the ability of the community to use and distribute the software at no cost can make it difficult to sell the software at a profit, funding models exist to give everyone the freedom to charge for distributing, modifying or any other work performed with free software.
