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Therefore, software distributed under the terms of GPLv1 could be combined with software under more permissive terms, as this would not change the terms under which the whole could be distributed.
To prevent this, GPLv1 stated that modified versions, as a whole, had to be distributed under the terms of GPLv1. The union of two sets of restrictions would apply to the combined work, thus adding unacceptable restrictions.
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The second problem was that distributors might add restrictions, either to the license or by combining the software with other software that had other restrictions on distribution.
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To prevent this, GPLv1 stated that copying and distributing copies of any portion of the program must also make the human-readable source code available under the same licensing terms. The first problem was that distributors may publish only binary files that are executable, but not readable or modifiable by humans.
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Version 1 of the GNU GPL, released on 25 February 1989, prevented what were then the two main ways that software distributors restricted the freedoms that define free software. Version 1 GNU General Public License, version 1 Published Version 3 was developed to attempt to address these concerns and was officially released on 29 June 2007. These problems included tivoization (the inclusion of GPL-licensed software in hardware that refuses to run modified versions of its software), compatibility issues similar to those of the Affero General Public License, and patent deals between Microsoft and distributors of free and open-source software, which some viewed as an attempt to use patents as a weapon against the free software community. Over the following 15 years, members of the free software community became concerned over problems in the GPLv2 license that could let someone exploit GPL-licensed software in ways contrary to the license's intent. The second version of the license, version 2, was released in 1991. Stallman's goal was to produce one license that could be used for any project, thus making it possible for many projects to share code. These licenses contained similar provisions to the modern GPL, but were specific to each program, rendering them incompatible, despite being the same license. The original GPL was based on a unification of similar licenses used for early versions of GNU Emacs (1985), the GNU Debugger, and the GNU C Compiler. The GPL was written by Richard Stallman in 1989, for use with programs released as part of the GNU project. The "or any later version" clause is sometimes known as a lifeboat clause since it allows combinations between different versions of GPL licensed software to maintain compatibility. Software projects licensed with the optional "or later" clause include the GNU Project, while the Linux kernel, for instance, is licensed under GPLv2 only. To keep the license up to date, the GPL license includes an optional "any later version" clause, allowing users to choose between the original terms or the terms in new versions as updated by the FSF. In 2007, the third version of the license (GPLv3) was released to address some perceived problems with the second version (GPLv2) which were discovered during the latter's long-time usage. Wheeler argues that the copyleft provided by the GPL was crucial to the success of Linux-based systems, giving the programmers who contributed to the kernel the assurance that their work would benefit the whole world and remain free, rather than being exploited by software companies that would not have to give anything back to the community. Prominent free software programs licensed under the GPL include the Linux kernel and the GNU Compiler Collection (GCC). Historically, the GPL license family has been one of the most popular software licenses in the free and open-source software domain. It is more restrictive than the Lesser General Public License and even further distinct from the more widely used permissive software licenses BSD, MIT, and Apache.
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These GPL series are all copyleft licenses, which means that any derivative work must be distributed under the same or equivalent license terms. The license grants the recipients of a computer program the rights of the Free Software Definition. The license was the first copyleft for general use and was originally written by the founder of the Free Software Foundation (FSF), Richard Stallman, for the GNU Project. The GNU General Public License ( GNU GPL or simply GPL) is a series of widely used free software licenses that guarantee end users the four freedoms to run, study, share, and modify the software. Software licensed under GPL compatible licenses only, depending on the version used. Linking from code with a different licence
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