In law , severability (sometimes known as salvatorius , from Latin) refers to a provision in a contract or piece of legislation which states that if some of the terms are held to be illegal or otherwise unenforceable, the remainder should still apply. Sometimes, severability clauses will state that some provisions to the contract are so essential to the contract's purpose that if they are illegal or unenforceable, the contract as a whole will be voided. However, in many legal jurisdictions , a severability clause will not be applied if it changes the fundamental nature of the contract, and that instead the contract will be void; thus, often this is not explicitly stated in the severability clause.
96-563: 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, and modify the software. The GPL was the first copyleft license for general use. It was originally written by Richard Stallman , the founder of the Free Software Foundation (FSF), for the GNU Project . The license grants
192-700: A Balkanisation of the "Open Source Universe". Linus Torvalds, who decided not to adopt the GPLv3 for the Linux kernel, reiterated his criticism several years later. GPLv3 improved compatibility with several free software licenses such as the Apache License, version 2.0, and the GNU Affero General Public License, which GPLv2 could not be combined with. However, GPLv3 software could only be combined and share code with GPLv2 software if
288-618: A copyleft license and another license is often only a one-way compatibility. This "one-way compatibility" characteristic is, for instanced, criticized by the Apache Foundation , who provides the more permissive Apache license which doesn't have this characteristic. Non-copyleft licenses, such as the FOSS permissive licenses , have a less complicated license interaction and normally exhibit better license compatibility. For example, if one license says "modified versions must mention
384-651: A dual-license setup, along with the GNU General Public License . The vast majority of free software uses undisputed free-software licenses; however, there have been many debates over whether or not certain other licenses qualify for the definition. Examples of licenses that provoked debate were the 1.x series of the Apple Public Source License , which were accepted by the Open Source Initiative but not by
480-620: A patent infringement claim or other litigation to impair users' freedom under the license. By 1990, it was becoming apparent that a less restrictive license would be strategically useful for the C library and for software libraries that essentially did the job of existing proprietary ones; when version 2 of the GPL (GPLv2) was released in June 1991, therefore, a second license – the GNU Library General Public License –
576-451: A "user" and a "consumer product". It also explicitly removed the section on "Geographical Limitations", the probable removal of this section having been announced at the launch of the public consultation. The fourth discussion draft, which was the last, was released on 31 May 2007. It introduced Apache License version 2.0 compatibility (prior versions are incompatible), clarified the role of outside contractors, and made an exception to avoid
672-406: A US federal court ruled that an open-source license is an enforceable contract. In October 2021 SFC sued Vizio over breach of contract as an end user to request source code for Vizio's TVs, a federal judge has ruled in the interim that the GPL is an enforceable contract by end users as well as a license for copyright holders. The text of the GPL is itself copyrighted , and the copyright is held by
768-531: A different position on licensing. The main difference is the belief that the copyleft licenses, particularly the GNU General Public License (GPL), are undesirably complicated and/or restrictive. The GPL requires any derivative work to also be released according to the GPL while the BSD license does not. Essentially, the BSD license's only requirement is to acknowledge the original authors, and poses no restrictions on how
864-505: A license software could not truly be waived into public domain and can't be interpreted as very permissive FOSS license, a position which faced opposition by Daniel J. Bernstein and others. In 2012 the dispute was finally resolved when Rosen accepted the CC0 as open source license , while admitting that contrary to his previous claims copyright can be waived away, backed by Ninth circuit decisions. In 2007, after years of draft discussion,
960-443: A licensee has no right to redistribute it, not even in modified form (barring fair use ), except under the terms of the license. One is only required to adhere to the terms of the GPL if one wishes to exercise rights normally restricted by copyright law, such as redistribution. Conversely, if one distributes copies of the work without abiding by the terms of the GPL (for instance, by keeping the source code secret), they can be sued by
1056-460: A modified derivative of a GPL licensed content management system is not required to distribute its changes to the underlying software, because the modified web portal is not being redistributed but rather hosted, and also because the web portal output is also not a derivative work of the GPL licensed content management system. There has been debate on whether it is a violation of the GPLv1 to release
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#17327930752161152-600: A problem which had not previously existed. This new threat was one of the reasons for writing version 3 of the GNU GPL in 2006. In recent years, a term coined tivoization describes a process where hardware restrictions are used to prevent users from running modified versions of the software on that hardware, in which the TiVo device is an example. It is viewed by the FSF as a way to turn free software to effectively non-free, and
1248-429: A severability doctrine when they deem one or more clauses of a passed statute as unconstitutional. This doctrine is used to evaluate the rest of the legislative statute, if it lacks severability clauses, to determine if the unconstitutional clauses can be severed from the rest of statute without affecting the intent or execution of the statute, thus keeping as much of the passed statute as possible. The severability doctrine
1344-481: A term for the copying and duplication of software, was explicitly defined. The public consultation process was coordinated by the Free Software Foundation with assistance from Software Freedom Law Center, Free Software Foundation Europe , and other free software groups. Comments were collected from the public via the gplv3.fsf.org web portal, using purpose-written software called stet . During
1440-783: A user's rights if said user embarks on litigation proceedings against them due to patent litigation. Patent retaliation emerged in response to proliferation and abuse of software patents . The majority of free-software licenses require that modified software not claim to be unmodified. Some licenses also require that copyright holders be credited. One such example is version 2 of the GNU GPL, which requires that interactive programs that print warranty or license information, may not have these notices removed from modified versions intended for distribution. Licenses of software packages containing contradictory requirements render it impossible to combine source code from such packages in order to create new software packages. License compatibility between
1536-417: Is allowed to charge a fee for this service or do this free of charge. This latter point distinguishes the GPL from software licenses that prohibit commercial redistribution. The FSF argues that free software should not place restrictions on commercial use, and the GPL explicitly states that GPL works may be sold at any price. The GPL additionally states that a distributor may not impose "further restrictions on
1632-409: Is an issue regarding linking: namely, whether a proprietary program that uses a GPL library is in violation of the GPL. Free software license Higher categories: Software , freedom A free-software license is a notice that grants the recipient of a piece of software extensive rights to modify and redistribute that software. These actions are usually prohibited by copyright law, but
1728-447: Is applied to ensure that end users retain the freedoms defined above. However, software running as an application program under a GPL-licensed operating system such as Linux is not required to be licensed under GPL or to be distributed with source-code availability—the licensing depends only on the used libraries and software components and not on the underlying platform. For example, if a program consists only of original source code , or
1824-425: Is combined with source code from other software components , then the custom software components need not be licensed under GPL and need not make their source code available; even if the underlying operating system used is licensed under the GPL, applications running on it are not considered derivative works. Only if GPL licensed parts are used in a program (and the program is distributed), then all other source code of
1920-410: Is generally believed that such agendas should not be served through software licenses; among other things because of practical aspects such as resulting legal uncertainties and problems with enforceability of vague, broad and/or subjective criteria or because tool makers are generally not held responsible for other people's use of their tools. Nevertheless some projects include legally non-binding pleas to
2016-452: Is how the compiled code was available and there are "clear directions" on where to find the source code. The FSF does not hold the copyright for a work released under the GPL unless an author explicitly assigns copyrights to the FSF (which seldom happens except for programs that are part of the GNU project). Only the individual copyright holders have the authority to sue when a license violation
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#17327930752162112-499: Is prohibited by copyright law . The FSF argues that freedom-respecting free software should also not restrict commercial use and distribution (including redistribution): In purely private (or internal) use—with no sales and no distribution—the software code may be modified and parts reused without requiring the source code to be released. For sales or distribution, the entire source code needs to be made available to end users, including any code changes and additions—in that case, copyleft
2208-694: Is qualitatively different from software and is subject to different requirements. Debian accepted, in a later resolution, that the GNU FDL complied with the Debian Free Software Guidelines when the controversial " invariant section " is removed, but considers it "still not free of trouble". Notwithstanding, most GNU documentation includes "invariant sections". Similarly, the FLOSS Manuals foundation, an organization devoted to creating manuals for free software, decided to eschew
2304-498: Is suspected. Software under the GPL may be run for all purposes, including commercial purposes and even as a tool for creating proprietary software , such as when using GPL-licensed compilers . Users or companies who distribute GPL-licensed works (e.g. software), may charge a fee for copies or give them free of charge. This distinguishes the GPL from shareware software licenses that allow copying for personal use but prohibit commercial distribution or proprietary licenses where copying
2400-485: Is why they have chosen to prohibit it in GPLv3 . Most newly written free-software licenses since the late 1990s include some form of patent retaliation clauses. These measures stipulate that one's rights under the license (such as to redistribution), may be terminated if one attempts to enforce patents relating to the licensed software, under certain circumstances. As an example, the Apple Public Source License may terminate
2496-694: The ASP loophole in the GPL . As there were concerns expressed about the administrative costs of checking code for this additional requirement, it was decided to keep the GPL and the AGPL license separated. Others, notably some high-profile Linux kernel developers such as Linus Torvalds , Greg Kroah-Hartman , and Andrew Morton , commented to the mass media and made public statements about their objections to parts of discussion drafts 1 and 2. The kernel developers referred to GPLv3 draft clauses regarding DRM / Tivoization , patents, and "additional restrictions", and warned of
2592-450: The AGPL (v1) , 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. Version 3 was developed as an attempt to address these concerns and was officially released on 29 June 2007. Version 1 of the GNU GPL, released on 25 February 1989, was written to protect against
2688-633: The Fedora Project 's packages showed as most used licenses the GPL family, followed by MIT, BSD, the LGP family, Artistic (for Perl packages), LPPL (for texlive packages), and ASL. The GNU GPLv2+ was the single most popular license Severability If a provision of this Agreement is or becomes illegal, invalid or unenforceable in any jurisdiction, that shall not affect: Severability clauses are also commonly found in legislation under constitutional law , where they state that if some provisions of
2784-800: The Open Source Definition rather than the Free Software Definition . It considers Free Software Permissive license group to be a reference implementation of a Free Software license. Thus its requirements for approving licenses are different. The Free Software Foundation , the group that maintains the Free Software Definition , maintains a non-exhaustive list of free-software licences. The Free Software Foundation prefers copyleft ( share-alike ) free-software licensing rather than permissive free-software licensing for most purposes. Its list distinguishes between free-software licenses that are compatible or incompatible with
2880-554: The WIPO Copyright Treaty , and that those who convey the work waive all legal power to prohibit circumvention of the technical protection measure "to the extent such circumvention is effected by exercising rights under this License with respect to the covered work". This means that users cannot be held liable for circumventing DRM implemented using GPLv3-licensed code under laws such as the U.S. Digital Millennium Copyright Act (DMCA). The distribution rights granted by
2976-470: The licensing of software . Free-software licenses before the late 1980s were generally informal notices written by the developers themselves. These early licenses were of the " permissive " kind. 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, which
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3072-401: The source code available to anyone when they share or sell the object code . In this case, the source code must also contain any changes the developers may have made. If GPL code is used but not shared or sold, the code is not required to be made available and any changes may remain private. This permits developers and organizations to use and modify GPL code for private purposes (that is, when
3168-467: The source code may be used. As a result, BSD code can be used in proprietary software that only acknowledges the authors. For instance, Microsoft Windows NT 3.1 and macOS have proprietary IP stacks which are derived from BSD-licensed software. In extreme cases, the sub- or re-licensing possibilities with BSD or other permissive licenses might prevent further use in the open-source ecosystem. For instance, MathWorks ' FileExchange repository offers
3264-536: The BSD license for user contributions but prevents with additional terms of use any usage beside their own proprietary MATLAB software, for instance with the FOSS GNU Octave software. Supporters of the BSD license argue that it is more free than the GPL because it grants the right to do anything with the source code, provided that the attribution is preserved. The approach has led to BSD code being used in widely used proprietary software. Proponents of
3360-668: The Department of Computer Science at the University of Victoria in Canada, presented a talk in 2013 about the methodological challenges in determining which are the most widely used free-software licenses, and showed how he could not replicate the result from Black Duck Software. A GitHub study in 2015 on their statistical data found that the MIT license was the most prominent FOSS license on that platform. In June 2016 an analysis of
3456-555: The FOSS ecosystem. In this trend companies and new projects ( Mozilla , Apache foundation , and Sun , see also this list ) wrote their own FOSS licenses, or adapted existing licenses. This License proliferation was later recognized as problem for the Free and open-source ecosystem due to the increased complexity of license compatibility considerations. While the creation of new licenses slowed down later, license proliferation and its impact are considered an ongoing serious challenge for
3552-537: The FSF's copyleft GNU General Public License . There exists an ongoing debate within the free-software community regarding the fine line between what restrictions can be applied and still be called "free". Only " public-domain software " and software under a public-domain-like license is restriction-free. Examples of public-domain-like licenses are, for instance, the WTFPL and the CC0 license. Permissive licenses might carry small obligations like attribution of
3648-559: The Free Software Foundation or Debian and the RealNetworks Public Source License , which was accepted by Open Source Initiative and Free Software Foundation but not by Debian . Also, the FSF recommended GNU Free Documentation License , which is incompatible with the GPL, was considered "non-free" by the Debian project around 2006, Nathanael Nerode, and Bruce Perens . The FSF argues that documentation
3744-655: The Free Software Foundation says it is not free because it infringes the so-called "zero freedom" of the GPL, that is, the freedom to use the software for any purpose. While historically the most widely used FOSS license has been the GPLv2, in 2015, according to Black Duck Software the permissive MIT license dethroned the GPLv2 to the second place while the permissive Apache License follows at third place. A study from 2012, which used publicly available data, criticized Black Duck Software for not publishing their methodology used in collecting statistics. Daniel German, professor in
3840-579: The Free Software Foundation. The FSF permits people to create new licenses based on the GPL, as long as the derived licenses do not use the GPL preamble without permission. This is discouraged, however, since such a license might be incompatible with the GPL and causes a perceived license proliferation . Other licenses created by the GNU project include the GNU Lesser General Public License , GNU Free Documentation License , and GNU Affero General Public License . The text of
3936-575: The GFDL in favor of the GPL for its texts in 2007, citing the incompatibility between the two, difficulties in implementing the GFDL, and the fact that the GFDL "does not allow for easy duplication and modification", especially for digital documentation. SLUC is a software license published in Spain in December 2006 to allow all but military use. The writers of the license maintain it is free software, but
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4032-404: The GPL for modified versions of the work are not unconditional. When someone distributes a GPL licensed work plus their own modifications, the requirements for distributing the whole work cannot be any greater than the requirements that are in the GPL. This requirement is known as copyleft. It earns its legal power from the use of copyright on software programs. Because a GPL work is copyrighted,
4128-605: The GPL for the distributed computing software GPU in 2005, as well as several software projects trying to exclude use by big cloud providers. As there are several defining organizations and groups who publish definitions and guidelines about FOSS licenses, notably the FSF, the OSI, the Debian project, and the BSDs, there are sometimes conflicting opinions and interpretations. Many users and developers of BSD -based operating systems have
4224-526: The GPL is not itself under the GPL. The license's copyright disallows modification of the license. Copying and distributing the license is allowed since the GPL requires recipients to get "a copy of this License along with the Program". According to the GPL FAQ, anyone can make a new license using a modified version of the GPL as long as they use a different name for the license, do not mention "GNU", and remove
4320-534: The GPL license family has been one of the most popular software licenses in the free and open-source software (FOSS) domain. Prominent free software programs licensed under the GPL include the Linux kernel and the GNU Compiler Collection (GCC). David A. Wheeler argues that the copyleft provided by the GPL was crucial to the success of Linux -based systems, giving the programmers who contributed to
4416-588: 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. Software projects licensed with the optional "or later" clause include the GNU Project, while projects like the Linux kernel is licensed under GPLv2 only. 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. The original GPL
4512-430: The GPL licensed program, they may still use the software within their organization however they like, and works (including programs) constructed by the use of the program are not required to be covered by this license. Software developer Allison Randal argued that the GPLv3 as a license is unnecessarily confusing for lay readers, and could be simplified while retaining the same conditions and legal force. In April 2017,
4608-443: The GPL point out that once code becomes proprietary, users are denied the freedoms that define free software. As a result, they consider the BSD license less free than the GPL, and that freedom is more than a lack of restriction. Since the BSD license restricts the right of developers to have changes recontributed to the community, neither it nor the GPL is "free" in the sense of "lacking any restrictions." The Debian project uses
4704-631: The GPLv2 is, by itself, not compatible with the GPLv3. Restrictions on use of a software ("use restrictions") are generally unacceptable according to the FSF, OSI , Debian , or the BSD-based distributions. Examples include prohibiting that the software be used for non-private applications, for military purposes, for comparison or benchmarking, for good use, for ethically questionable means, or in commercial organizations. While some restrictions on user freedom, e.g. concerning nuclear war, seem to enjoy moral support among most free software developers, it
4800-409: The GPLv2 license used had the optional "or later" clause and the software was upgraded to GPLv3. While the "GPLv2 or any later version" clause is considered by FSF as the most common form of licensing GPLv2 software, Toybox developer Rob Landley described it as a lifeboat clause . Software projects licensed with the optional "or later" clause include the GNU Project , while a prominent example without
4896-462: The GPLv3 as major update of the GPLv2 was released. The release was controversial due to the significant extended scope of the license, which made it incompatible with the GPLv2. Several major FOSS projects ( Linux kernel , MySQL , BusyBox , Blender , VLC media player ) decided against adopting the GPLv3. On the other hand, in 2009, two years after the release of the GPLv3, Google open-source programs office manager Chris DiBona reported that
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#17327930752164992-576: The Software Package Data Exchange (SPDX). The license includes instructions to specify "version 2 of the License, or (at your option) any later version" to allow the flexible optional use of either version 2 or 3, but some developers change this to specify "version 2" only. In late 2005, the Free Software Foundation (FSF) announced work on version 3 of the GPL (GPLv3). On 16 January 2006, the first "discussion draft" of GPLv3
5088-540: The author but allow practically all code use cases. Certain licenses, namely the copyleft licenses , include intentionally stronger restrictions (especially on the distribution/distributor) in order to force derived projects to guarantee specific rights which can't be taken away. The free-software share-alike licenses written by Richard Stallman in the mid-1980s pioneered a concept known as "copyleft". Ensuing copyleft provisions stated that when modified versions of free software are distributed, they must be distributed under
5184-426: The clause is the Linux kernel. The final version of the license text was published on 29 June 2007. The terms and conditions of the GPL must be made available to anybody receiving a copy of a work that has a GPL applied to it ("the licensee"). Any licensee who adheres to the terms and conditions is given permission to modify the work, as well as to copy and redistribute the work or any derivative version. The licensee
5280-497: The code or the project is not sold or otherwise shared) without being required to make their changes available to the public. Supporters of GPL claim that by mandating that derivative works remain under the GPL, it fosters the growth of free software and requires equal participation by all users. Opponents of GPL claim that "no license can guarantee future software availability" and that the disadvantages of GPL outweigh its advantages. Some also argue that restricting distribution makes
5376-515: The copyright law recognizes both forms. Free-software licenses provide risk mitigation against different legal threats or behaviors that are seen as potentially harmful by developers: In the early times of software, sharing of software and source code was common in certain communities, for instance academic institutions. Before the US Commission on New Technological Uses of Copyrighted Works (CONTU) decided in 1974 that "computer programs, to
5472-631: The criteria laid out in its Debian Free Software Guidelines (DFSG). The only notable cases where Debian and Free Software Foundation disagree are over the Artistic License and the GNU Free Documentation License (GFDL). Debian accepts the original Artistic License as being a free software license, but FSF disagrees. This has very little impact however since the Artistic License is almost always used in
5568-560: The developers in any advertising materials", and another license says "modified versions cannot contain additional attribution requirements", then, if someone combined a software package which uses one license with a software package which uses the other, it would be impossible to distribute the combination because these contradictory requirements cannot be fulfilled simultaneously. Thus, these two packages would be license-incompatible. When it comes to copyleft software licenses, they are not inherently compatible with other copyleft licenses, even
5664-500: The extent that they embody an author's original creation, are proper subject matter of copyright", software was not considered copyrightable. Therefore, software had no licenses attached and was shared as public-domain software . The CONTU decision plus court decisions such as Apple v. Franklin in 1983 for object code , clarified that the Copyright Act gave computer programs the copyright status of literary works and started
5760-503: The fact that any one or more section, subsection, sentence, clause, phrase, word, provision or application be declared illegal, invalid, unenforceable, and/or unconstitutional. Many laws have clauses specifying clearly the exact opposite, in which only all parts of the law taken together can be enforced: This act is to be construed as a whole, and all parts of it are to be read and construed together. If any part of this act shall be adjudged by any court of competent jurisdiction to be invalid,
5856-605: The free and open-source ecosystem. From the free-software licenses, the GNU GPL version 2 has been tested in to court, first in Germany in 2004 and later in the US. In the German case the judge did not explicitly discuss the validity of the GPL's clauses but accepted that the GPL had to be adhered to: "If the GPL were not agreed upon by the parties, defendant would notwithstanding lack the necessary rights to copy, distribute, and make
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#17327930752165952-415: The kernel 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. 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. To keep the license current,
6048-509: The law, or certain applications of those provisions, are found to be unconstitutional, the remaining provisions, or the remaining applications of those provisions, will, nonetheless, continue in force as law. A broad example would be one like this: If any one or more section, subsection, sentence, clause, phrase, word, provision or application of this Ordinance shall for any person or circumstance be held to be illegal, invalid, unenforceable, and/or unconstitutional, such decision shall not affect
6144-535: The legal distinction between a license and a contract is an important one: contracts are enforceable by contract law , whereas licenses are enforced under copyright law . However, this distinction is not useful in the many jurisdictions where there are no differences between contracts and licenses, such as civil law systems. Those who do not accept the GPL's terms and conditions do not have permission, under copyright law, to copy or distribute GPL-licensed software or derivative works. However, if they do not redistribute
6240-492: The license less free. Whereas proponents would argue that not preserving freedom during distribution would make it less free. For example, a non-copyleft license does not grant the author the freedom to see modified versions of his or her work if it gets publicly published, whereas a copyleft license does grant that freedom. During the 1990s, free-software licenses began including clauses, such as patent retaliation , in order to protect against software patent litigation cases –
6336-419: The license. Copyleft applies only when a person seeks to redistribute the program. Developers may make private modified versions with no obligation to divulge the modifications, as long as they do not distribute the modified software to anyone else. Copyleft applies only to the software, and not to its output (unless that output is itself a derivative work of the program). For example, a public web portal running
6432-430: The major change in GPLv2 was the "Liberty or Death" clause, as he calls it – Section 7. The section says that licensees may distribute a GPL-covered work only if they can satisfy all of the license's obligations, despite any other legal obligations they might have. In other words, the obligations of the license may not be severed due to conflicting obligations. This provision is intended to discourage any party from using
6528-412: The most important changes were in relation to software patents , free software license compatibility, the definition of "source code", and hardware restrictions on software modifications, such as tivoization . Other changes related to internationalization, how license violations are handled, and how additional permissions could be granted by the copyright holder. The concept of "software propagation", as
6624-589: The number of open-source projects licensed software that had moved to GPLv3 from GPLv2 was 50%, counting the projects hosted at Google Code . In 2011, four years after the release of the GPLv3, 6.5% of all open-source licensed projects were GPLv3 while 42.5% were still GPLv2 according to Black Duck Software data. Following in 2011 451 Group analyst Matthew Aslett argued in a blog post that copyleft licenses went into decline and permissive licenses increased, based on statistics from Black Duck Software. In 2015 according to Black Duck Software and GitHub statistics,
6720-453: The original author under copyright law. Copyright law has historically been used to prevent distribution of work by parties not authorized by the creator. Copyleft uses the same copyright laws to accomplish a very different goal. It grants rights to distribution to all parties insofar as they provide the same rights to subsequent ones, and they to the next, etc. In this way, the GPL and other copyleft licenses attempt to enforce libre access to
6816-508: The parties who would receive the covered work from you, a discriminatory patent license ... This aimed to make such future deals ineffective. The license was also meant to cause Microsoft to extend the patent licenses it granted to Novell customers for the use of GPLv3 software to all users of that GPLv3 software; this was possible only if Microsoft was legally a "conveyor" of the GPLv3 software. Early drafts of GPLv3 also let licensors add an AGPL -like requirement that would have plugged
6912-457: The perceived problems of a Microsoft–Novell style agreement, saying in Section 11 paragraph 6 that: You may not convey a covered work if you are a party to an arrangement with a third party that is in the business of distributing software, under which you make payment to the third party based on the extent of your activity of conveying the work, and under which the third party grants, to any of
7008-572: The permissive MIT license dethroned the GPLv2 as most popular free-software license to the second place while the permissive Apache license follows already at third place. In June 2016 an analysis of Fedora Project 's packages revealed as most used licenses the GPL, MIT, BSD, and the LGPL . The group Open Source Initiative (OSI) defines and maintains a list of approved open-source licenses . OSI agrees with FSF on all widely used free-software licenses, but differ from FSF's list, as it approves against
7104-407: The preamble, though the preamble can be used in a modified license if permission to use it is obtained from the Free Software Foundation (FSF). According to the FSF, "The GPL does not require you to release your modified version or any part of it. You are free to make modifications and use them privately, without ever releasing them." However, if one releases a GPL-licensed entity to the public, there
7200-526: The program needs to be made available under the same license terms. The GNU Lesser General Public License (LGPL) was created to have a weaker copyleft than the GPL, in that it does not require custom-developed source code (distinct from the LGPL licensed parts) to be made available under the same license terms. The fifth section of version 3 states that no GPL-licensed code shall be considered an effective "technical protection measure" as defined by Article 11 of
7296-417: The public consultation process, 962 comments were submitted for the first draft. By the end of the comment period, a total of 2,636 comments had been submitted. The third draft was released on 28 March 2007. This draft included language intended to prevent patent-related agreements such as the controversial Microsoft-Novell patent agreement , and restricted the anti-tivoization clauses to a legal definition of
7392-604: The recipients of a computer program the rights of the Free Software Definition . The licenses in the GPL series are all copyleft licenses, which means that any derivative work must be distributed under the same or equivalent license terms. It is more restrictive than the Lesser General Public License and even further distinct from the more widely-used permissive software licenses such as BSD , MIT , and Apache . Historically,
7488-407: The remainder of this act shall be invalidated. Nothing herein shall be construed to affect the parties' right to appeal the matter. (example New Hampshire statute) A more extreme variant is a clause specifying all parties should undo all the gains they earned due to that law/contract if any provision is adjudged to be invalid. In court systems within constitutional law countries, judges may employ
7584-426: The rights granted by the GPL". This forbids activities such as distributing the software under a non-disclosure agreement or contract. The fourth section for version 2 of the license and the seventh section of version 3 require that programs distributed as pre-compiled binaries be accompanied by a copy of the source code, a written offer to distribute the source code via the same mechanism as the pre-compiled binary, or
7680-415: The rights-holder (usually the author) of a piece of software can remove these restrictions by accompanying the software with a software license which grants the recipient these rights. Software using such a license is free software (or free and open-source software ) as conferred by the copyright holder. Free-software licenses are applied to software in source code and also binary object-code form, as
7776-452: The same terms as the original software. Hence they are referred to as "share and share alike " or " quid pro quo ". This results in the new software being open source as well. Since copyleft ensures that later generations of the software grant the freedom to modify the code, this is "free software". Non-copyleft licenses do not ensure that later generations of the software will remain free. Developers who use GPL code in their product must make
7872-404: The software 'netfilter/iptables' publicly available." Because the defendant did not comply with the GPL, it had to cease use of the software. The US case ( MySQL vs Progress) was settled before a verdict was arrived at, but at an initial hearing, Judge Saris "saw no reason" that the GPL would not be enforceable. Around 2004 lawyer Lawrence Rosen argued in the essay Why the public domain isn't
7968-438: The source code in obfuscated form, such as in cases in which the author is less willing to make the source code available. The consensus was that while unethical, it was not considered a violation. The issue was clarified when the license was altered with v2 to require that the "preferred" version of the source code be made available. The GPL was designed as a license , rather than a contract. In some common law jurisdictions,
8064-417: 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. However, software distributed under GPLv1 could not be combined with software distributed under a more restrictive license, as this would conflict with the requirement that the whole be distributable under the terms of GPLv1. According to Richard Stallman,
8160-445: The two main methods by which software distributors restricted the freedoms that define free software. The first problem was that distributors might publish only binary files that are executable, but not readable or modifiable by humans. 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 second problem
8256-472: The user, prominently SQLite . Among the repeated attempts by developers to regulate user behavior through the license that sparked wider debate are Douglas Crockford 's (joking) “no evil” clause, which affected the release process of the Debian distribution in 2012 and got the JSMin-PHP project expelled from Google Code , the addition of a pacifist condition based on Asimov's First Law of Robotics to
8352-717: The validity of any other section, subsection, sentence, clause, phrase, word, provision or application of this Ordinance which is operable without the offending section, subsection, sentence, clause, phrase, word, provision or application shall remain effective notwithstanding such illegal, invalid, unenforceable, and/or unconstitutional section, subsection, sentence, clause, phrase, word, provision or application, and every section, subsection, sentence, clause, phrase, word, provision or application of this Ordinance are declared severable. The legislature hereby declares that it would have passed each part, and each provision, section, subsection, sentence, clause, phrase or word thereof, irrespective of
8448-514: The work and all derivatives. Many distributors of GPL licensed programs bundle the source code with the executables . An alternative method of satisfying the copyleft is to provide a written offer to provide the source code on a physical medium (such as a CD) upon request. In practice, many GPL licensed programs are distributed over the Internet, and the source code is made available over FTP or HTTP . For Internet distribution, this complies with
8544-510: The written offer to obtain the source code that the user got when they received the pre-compiled binary under the GPL. The second section of version 2 and the fifth section of version 3 also require giving "all recipients a copy of this License along with the Program". Version 3 of the license allows making the source code available in additional ways in fulfillment of the seventh section. These include downloading source code from an adjacent network server or by peer-to-peer transmission, provided that
8640-438: Was introduced at the same time and numbered with version 2 to show that both were complementary. The version numbers diverged in 1999 when version 2.1 of the LGPL was released, which renamed it the GNU Lesser General Public License to reflect its place in the philosophy. The GPLv2 was also modified to refer to the new name of the LGPL, but its version number remained the same, resulting in the original GPLv2 not being recognised by
8736-501: Was published, and the public consultation began. The public consultation was originally planned for nine to fifteen months, but ultimately lasted eighteen months, with four drafts being published. The official GPLv3 was released by the FSF on 29 June 2007. GPLv3 was written by Richard Stallman, with legal counsel from Eben Moglen and Richard Fontana from the Software Freedom Law Center . According to Stallman,
8832-518: Was published. Version 2 of the GPL, released in 1991, went on to become the most widely used free-software license. Starting in the mid-1990s and until the mid-2000s, the open-source movement pushed and focused the free-software idea forward in the wider public and business perception. In the Dot-com bubble time, Netscape Communications ' step to release its webbrowser under a FOSS license in 1998, inspired many other companies to adapt to
8928-468: Was revised into the "GNU Emacs General Public License" in late 1985, and clarified in March 1987 and February 1988. Likewise, the similar GCC General Public License was applied to the GNU Compiler Collection , which was initially published in 1987. The original BSD license is also one of the first free-software licenses, dating to 1988. In 1989, version 1 of the GNU General Public License (GPL)
9024-425: Was that distributors might add restrictions, either to the license or by combining the software with other software that had other restrictions on distribution. The union of two sets of restrictions would apply to the combined work, thus adding unacceptable constrictions. To prevent this, GPLv1 stated that modified versions, as a whole, had to be distributed under the terms of GPLv1. Therefore, software distributed under
9120-593: Was to produce one license that could be used for any project, thus making it possible for many projects to share code. The second version of the license, version 2, was released in 1991. 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. 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
9216-477: Was written by Richard Stallman in 1989, for use with programs released as part of the GNU project. It was based on a unification of similar licenses used for early versions of GNU Emacs (1985), the GNU Debugger , and the GNU C Compiler . These licenses contained similar provisions to the modern GPL, but were specific to each program, rendering them incompatible, despite being the same license. Stallman's goal
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