Background
Under the closed source model source code is not released to the public. Closed source software is maintained by a team who produces their product in a compiled executable state, which is what the market is allowed access to. Microsoft, the owner and developer of Windows and Microsoft Office, along with other major software companies, have long been proponents of this business model. Although in August 2010, Microsoft interoperability general manager Jean Paoli said Microsoft "loves open source" and its anti-open source position was a mistake.
The FOSS model allows for able users to view and modify a product's source code. Common advantages cited by proponents for having such a structure are expressed in terms of trust, acceptance, teamwork and quality.
A non-free license is used to limit what free software movement advocates consider to be the essential freedoms. A license, whether providing open source code or not, that does not stipulate the "four software freedoms", are not considered "free" by the free software movement. A closed source license is one that limits only the availability of the source code. By contrast a copyleft license claims to protect the "four software freedoms" by explicitly granting them and then explicitly prohibiting anyone to redistribute the package or reuse the code in it to make derivative works without including the same licensing clauses. Some licenses grant the four software freedoms but allow redistributors to remove them if they wish. Such licenses are sometimes called permissive software licenses. An example of such a license is the FreeBSD License which allows derivative software to be distributed as non-free or closed source, as long as they give credit to the original designers.
FOSS can and has been commercialized by companies such as Red Hat, IBM, Novell, Oracle, Mozilla Foundation, VMware and others.
Read more about this topic: Comparison Of Open Source And Closed Source
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