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Diagram of software under various licenses according to the FSF and their The Free Software Definition: on the left side "free software", on the right side "proprietary software". On both sides, and therefore mostly orthogonal, "free download" . A software license is a legal instrument governing the use or redistribution of software.
While less common than commercial proprietary software, free and open-source software may also be commercial software in the free and open-source software (FOSS) domain. But unlike the proprietary model, commercialization is achieved in the FOSS commercialization model without limiting the users in their capability to share, reuse and duplicate software freely.
Sometimes, the source code is released under a liberal software license at its end of life. This type of software can also have its source code leaked or reverse engineered. While such software often later becomes open source software or public domain, other constructs and software licenses exist, for instance shared source or creative commons ...
FSF's free software and OSI's open-source licenses together are called FOSS licenses. There are licenses accepted by the OSI which are not free as per the Free Software Definition . The Open Source Definition allows for further restrictions like price, type of contribution and origin of the contribution, e.g. the case of the NASA Open Source ...
The SPDX License List contains extra BSD license variations. Examples include: [1] BSD-1-Clause, a license with only the source code retaining clause, used by Berkeley Software Design in the 1990s, [23] [24] and later used by the Boost Software License. OSI approved since 2020. [25] BSD-2-Clause-Patent, a variation of BSD-2-Clause with a patent ...
The name "MIT License" is potentially ambiguous. The Massachusetts Institute of Technology has used many licenses for software since its creation; for example, MIT offers four licensing options for the FFTW [23] C source code library, one of which is the GPL v2.0 and the other three of which are not open-source.
As described in the article Software license, such licenses either allow or restrict certain actions with regard to the software. Examples of such licenses include: A GNU license – Free software licenses which usually also incorporate copyleft to ensure any copied code remains free as in freedom. A common GNU license is the GNU General Public ...
Proprietary software is a subset of non-free software, a term defined in contrast to free and open-source software; non-commercial licenses such as CC BY-NC are not deemed proprietary, but are non-free.