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There are a number of different definitions of free content in regular use. Legally, however, free content is very similar to open content.An analogy is a use of the rival terms free software and open-source, which describe ideological differences rather than legal ones.
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.
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 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]
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 2000, the "Do What the Fuck You Want To Public License" was released as a public-domain-equivalent license for software. [2]It is distinguished among software licenses by its informal style and lack of a warranty disclaimer.
The GNU Lesser General Public License (LGPL) is a free-software license published by the Free Software Foundation (FSF). The license allows developers and companies to use and integrate a software component released under the LGPL into their own (even proprietary) software without being required by the terms of a strong copyleft license to release the source code of their own components.
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.