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More than 90 percent of companies use open-source software as a component of their proprietary software. [70] The decision to use open-source software, or even engage with open-source projects to improve existing open-source software, is typically a pragmatic business decision.
In the mid-1980s, the GNU project produced copyleft free-software licenses for each of its software packages. An early such license (the "GNU Emacs Copying Permission Notice") was used for GNU Emacs in 1985, [5] which was revised into the "GNU Emacs General Public License" in late 1985, and clarified in March 1987 and February 1988.
Permissive licenses generally originate in academic institutions like the Massachusetts Institute of Technology.. Permissive licenses, also known as academic licenses, [49] allow recipients to use, modify, and distribute software with no obligation to provide source code.
The GNU General Public Licenses (GNU GPL, or simply GPL) are a series of widely used free software licenses, or copyleft licenses, that guarantee end users the freedoms to run, study, share, or modify the software. [7]
BSD licenses are a family of permissive free software licenses, imposing minimal restrictions on the use and distribution of covered software.This is in contrast to copyleft licenses, which have share-alike requirements.
These examples of modern PD software (after the Berne Convention Implementation Act of 1988) are either under proper public domain (e.g. created by a US governmental organization), under a proper public domain like license (for instance CC0), or accompanied by a clear waiver statement from the author.
The Apache License is a permissive free software license written by the Apache Software Foundation (ASF). [4] It allows users to use the software for any purpose, to distribute it, to modify it, and to distribute modified versions of the software under the terms of the license, without concern for royalties.
Although both definitions refer to almost equivalent corpora of programs, the Free Software Foundation recommends using the term "free software" rather than "open-source software" (an alternative, yet similar, concept coined in 1998), because the goals and messaging are quite dissimilar.