Comparison With Free Software
The main difference is that by choosing one term over the other (i.e. either "open source" or "free software") one lets others know about what one's goals are. As Richard Stallman puts it, "Open source is a development methodology; free software is a social movement."
Critics have said that the term “open source” fosters an ambiguity of a different kind such that it confuses the mere availability of the source with the freedom to use, modify, and redistribute it. Developers have used the alternative terms Free/open source Software (FOSS), or Free/Libre/open source Software (FLOSS), consequently, to describe open source software which is also free software.
The term “open source” was originally intended to be trademarkable; however, the term was deemed too descriptive, so no trademark exists. The OSI would prefer that people treat Open Source as if it were a trademark, and use it only to describe software licensed under an OSI approved license.
OSI Certified is a trademark licensed only to people who are distributing software licensed under a license listed on the Open Source Initiative's list.
Open source software and free software are different terms for software which comes with certain rights, or freedoms, for the user. They describe two approaches and philosophies towards free software. Open source and free software (or software libre) both describe software which is free from onerous licensing restrictions. It may be used, copied, studied, modified and redistributed without restriction. Free software is not the same as freeware, software available at zero price.
The definition of open source software was written to be almost identical to the free software definition. There are very few cases of software that is free software but is not open source software, and vice versa. The difference in the terms is where they place the emphasis. “Free software” is defined in terms of giving the user freedom. This reflects the goal of the free software movement. “Open source” highlights that the source code is viewable to all; proponents of the term usually emphasize the quality of the software and how this is caused by the development models which are possible and popular among free and open source software projects.
Free software licenses are not written exclusively by the FSF. The FSF and the OSI both list licenses which meet their respective definitions of free software or open source software.
The FSF believes that knowledge of the concept of freedom is an essential requirement, insists on the use of the term free, and separates itself from the open source movement.
Read more about this topic: Open-source Software
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