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 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 the copyright law recognizes both forms.
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 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 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 "permissible " 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, with subsequent revisions in 1986, 1987 and 1988 taking the name of "GNU Emacs General Public License". 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) 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 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 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 USA. 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 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 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, 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 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 are GPLv3 while 42.5% are 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, 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 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 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 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 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 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 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 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 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 – 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 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 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.
Version 3 of the GNU GPL includes specific language prohibiting additional restrictions being enforced by hardware restrictions and digital rights management (DRM), a practice FSF calls tivoization after Tivo used GPL’d software on devices that disallowed user modification of that software.
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 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 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 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 organisations.
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 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 the source code may be used.
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. For example, users might incorporate the BSD-licensed code into proprietary products. The approach has led to BSD code being used in common, widely used proprietary software. In response, proponents of the GPL point out that once code becomes proprietary, users lack 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."
Code licensed under a permissive free software licence, such as the BSD license, can be incorporated into copylefted (for instance, GPL'd) projects. Such code is thus "GPL-compatible". There is no need to secure the consent of the original authors. In contrast, code under the GPL cannot be relicensed under the BSD license without securing the consent of all copyright holders. Thus the two licenses are compatible, but (unless such consent has been obtained) the combination as a whole must be distributed under the terms of the GPL and not the permissive license.
Existing free-software BSD-licensed projects tend to avoid including software licensed under the GPL in the core operating system, or the base system, except as a last resort when alternatives are non-existent or vastly less capable, such as with GCC. For example, starting with FreeBSD 10.0, the GCC was replaced by the Clang/LLVM compiler, The OpenBSD project has acted to remove GPL-licensed tools in favor of BSD-licensed alternatives, some newly written and some adapted from older code.
The Debian project uses 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 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 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 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 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 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 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.
In June 2016 an analysis of 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
GNU General Public License (GPL) 2.0 58.69% GNU Lesser General Public License (LGPL) 2.1 11.39% Artistic License (Perl) 7.46% BSD License 6.50% Apache License 2.0 2.92% MIT License 2.58% GNU General Public Liense (GPL) 3.0 1.64% Mozilla Public License (MPL) 1.1 1.37% Common Public License 0.83% zlib/lippng License 0.64%
License -> OSI: […] GNU General Public License (GPL) (32641 projects), GNU Library or Lesser General Public License (LGPL) (4889 projects of 45727, 82.1%)
Prior to 1998, Free Software referred either to the Free Software Foundation (and the watchful, micromanaging eye of Stallman) or to one of thousands of different commercial, avocational, or university-research projects, processes, licenses, and ideologies that had a variety of names: sourceware, freeware, shareware, open software, public domain software, and so on. The term Open Source, by contrast, sought to encompass them all in one movement.
Bold move to harness creative power of thousands of internet developers; company makes Netscape Navigator and Communicator 4.0 immediately free for all users, seeding market for enterprise and netcenter businesses
... the organization that manages open source developers working on the next generation of Netscape's browser and communication software. This event marked a historical milestone for the Internet as Netscape became the first major commercial software company to open its source code, a trend that has since been followed by several other corporations. Since the code was first published on the Internet, thousands of individuals and organizations have downloaded it and made hundreds of contributions to the software. Mozilla.org is now celebrating this one-year anniversary with a party Thursday night in San Francisco.
The term Open Source, by contrast, sought to encompass them all in one movement. The event that precipitated this attempted semantic coup d’état was the release of the source code for Netscape’s Communicator Web browser. It’s tough to overestimate the importance of Netscape to the fortunes of Free Software. […] But Netscape is far more famous among geeks for giving away something else, in 1998: the source code to Netscape Communicator (née Navigator).
Most rights can be voluntarily abandoned ("waived") by the owner of the rights. Legislators can go to extra effort to create rights that can't be abandoned, but usually they don't do this. In particular, you can voluntarily abandon your United States copyrights: "It is well settled that rights gained under the Copyright Act may be abandoned. But abandonment of a right must be manifested by some overt act indicating an intention to abandon that right. See Hampton v. Paramount Pictures Corp., 279 F.2d 100, 104 (9th Cir. 1960)."
The case you referenced in your email, Hampton v. Paramount Pictures, 279 F.2d 100 (9th Cir. Cal. 1960), stands for the proposition that, at least in the Ninth Circuit, a person can indeed abandon his copyrights (counter to what I wrote in my article) -- but it takes the equivalent of a manifest license to do so. :-) ... For the record, I have already voted +1 to approve the CC0 public domain dedication and fallback license as OSD compliant. I admit that I have argued for years against the "public domain" as an open source license, but in retrospect, considering the minimal risk to developers and users relying on such software and the evident popularity of that "license", I changed my mind. One can't stand in the way of a fire hose of free public domain software, even if it doesn't come with a better FOSS license that I trust more.
Currently the decision to move from GPL v2 to GPL v3 is being hotly debated by many open source projects. According to Palamida, a provider of IP compliance software, there have been roughly 2489 open source projects that have moved from GPLv2 to later versions.
No. Some of the requirements in GPLv3, such as the requirement to provide Installation Information, do not exist in GPLv2. As a result, the licenses are not compatible: if you tried to combine code released under both these licenses, you would violate section 6 of GPLv2. However, if code is released under GPL 'version 2 or later,' that is compatible with GPLv3 because GPLv3 is one of the options it permits.
In some ways, Linux was the project that really made the split clear between what the FSF is pushing which is very different from what open source and Linux has always been about, which is more of a technical superiority instead of a -- this religious belief in freedom," Torvalds told Zemlin. So, the GPL Version 3 reflects the FSF's goals and the GPL Version 2 pretty closely matches what I think a license should do and so right now, Version 2 is where the kernel is.
At the time, the decision seemed sensible in the face of a deadlock. But now, GPLv2 is used for 42.5% of free software, and GPLv3 for less than 6.5%, according to Black Duck Software.
Since BusyBox can be found in so many embedded systems, it finds itself at the core of the GPLv3 anti-DRM debate. […] The real outcomes, however, are this: BusyBox will be GPLv2 only starting with the next release. It is generally accepted that stripping out the "or any later version" is legally defensible, and that the merging of other GPLv2-only code will force that issue in any case.
Don't invent a straw man argument please. I consider licensing BusyBox under GPLv3 to be useless, unnecessary, overcomplicated, and confusing, and in addition to that it has actual downsides. 1) Useless: We're never dropping GPLv2.
Blender is also still 'GPLv2 or later'. For the time being we stick to that, moving to GPL 3 has no evident benefits I know of.
In 2001, VLC was released under the OSI-approved GNU General Public version 2, with the commonly-offered option to use 'any later version' thereof (though there was not any such later version at the time). Following the release by the Free Software Foundation (FSF) of the new version 3 of its GNU General Public License (GPL) on the 29th of June 2007, contributors to the VLC media player, and other software projects hosted at videolan.org, debated the possibility of updating the licensing terms for future version of the VLC media player and other hosted projects, to version 3 of the GPL. ... There is strong concern that these new additional requirements might not match the industrial and economic reality of our time, especially in the market of consumer electronics. It is our belief that changing our licensing terms to GPL version 3 would currently not be in the best interest of our community as a whole. Consequently, we plan to keep distributing future versions of VLC media player under the terms of the GPL version 2.
1. MIT license 24%, 2. GNU General Public License (GPL) 2.0 23%, 3. Apache License 16%, 4. GNU General Public License (GPL) 3.0 9%, 5. BSD License 2.0 (3-clause, New or Revised) License 6%, 6. GNU Lesser General Public License (LGPL) 2.1 5%, 7. Artistic License (Perl) 4%, 8. GNU Lesser General Public License (LGPL) 3.0 2%, 9. Microsoft Public License 2%, 10. Eclipse Public License (EPL) 2%
1 MIT 44.69%, 2 Other 15.68%, 3 GPLv2 12.96%, 4 Apache 11.19%, 5 GPLv3 8.88%, 6 BSD 3-clause 4.53%, 7 Unlicense 1.87%, 8 BSD 2-clause 1.70%, 9 LGPLv3 1.30%, 10 AGPLv3 1.05%
From the above chart it is clear that the GPL family is the highest used (I had miscalculated it as MIT before).The other major licenses are MIT, BSD, the LGPL family, Artistic (for Perl packages), LPPL (foe texlive packages), ASL.
a new method of trying to deprive the users of freedom. In broad terms we refer to this as tivoisation.
Copyleft is the main source of compatibility problems.
Apache 2 software can therefore be included in GPLv3 projects, because the GPLv3 license accepts our software into GPLv3 works. However, GPLv3 software cannot be included in Apache projects. The licenses are incompatible in one direction only, and it is a result of ASF's licensing philosophy and the GPLv3 authors' interpretation of copyright law.
Permissive licensing simplifies things One reason the business world, and more and more developers […], favor permissive licenses is in the simplicity of reuse. The license usually only pertains to the source code that is licensed and makes no attempt to infer any conditions upon any other component, and because of this there is no need to define what constitutes a derived work. I have also never seen a license compatibility chart for permissive licenses; it seems that they are all compatible.
The licences for distributing free or open source software (FOSS) are divided in two families: permissive and copyleft. Permissive licences (BSD, MIT, X11, Apache, Zope) are generally compatible and interoperable with most other licences, tolerating to merge, combine or improve the covered code and to re-distribute it under many licences (including non-free or 'proprietary').
GPLv3 broke "the" GPL into incompatible forks that can't share code.
the restriction that source code must be distributed or made available for all works that are derivatives […] As a consequence, software bound by the GPL terms cannot be included in the kernel or "runtime" of OpenBSD
Content that you submit must not directly compete with products offered by MathWorks. Content submitted to File Exchange may only be used with MathWorks products.
It is not possible to borrow text from a GFDL'd manual and incorporate it in any free software program whatsoever. This is not a mere license incompatibility. It's not just that the GFDL is incompatible with this or that free software license: it's that it is fundamentally incompatible with any free software license whatsoever. So if you write a new program, and you have no commitments at all about what license you want to use, saving only that it be a free license, you cannot include GFDL'd text. The GNU FDL, as it stands today, does not meet the Debian Free Software Guidelines. There are significant problems with the license, as detailed above; and, as such, we cannot accept works licensed under the GNU FDL into our distribution.
FSF, a Free Software organization, isn't being entirely true to the Free Software ethos while it is promoting a license that allows invariant sections to be applied to anything but the license text and attribution. FSF is not Creative Commons:the documentation that FSF handles is an essential component of FSF's Free Software, and should be treated as such. In that light, the GFDL isn't consistent with the ethos that FSF has promoted for 19 years.
The Academic Free License (AFL) is a permissive free software license written in 2002 by Lawrence E. Rosen, a former general counsel of the Open Source Initiative (OSI).
The license grants similar rights to the BSD, MIT, UoI/NCSA and Apache licenses – licenses allowing the software to be made proprietary – but was written to correct perceived problems with those licenses:
The AFL makes clear what software is being licensed by including a statement following the software's copyright notice;
The AFL includes a complete copyright grant to the software;
The AFL contains a complete patent grant to the software;
The AFL makes clear that no trademark rights are granted to the licensor's trademarks;
The AFL warrants that the licensor either owns the copyright or is distributing the software under a license;
The AFL is itself copyrighted, with the right granted to copy and distribute without modification.The Free Software Foundation consider all AFL versions through 3.0 as incompatible with the GNU GPL. though Eric S. Raymond (a co-founder of the OSI) contends that AFL 3.0 is GPL compatible. In late 2002, an OSI working draft considered it a "best practice" license. In mid-2006, however, the OSI's License Proliferation Committee found it "redundant with more popular licenses", specifically version 2 of the Apache Software License.Adempiere
ADempiere is an Enterprise Resource Planning or ERP software package released under a free software license. The word adempiere in Italian means "to fulfill" or "to accomplish".The software is licensed under the GNU General Public License.Apache License
The Apache License is a permissive free software license written by the Apache Software Foundation (ASF). The Apache License, Version 2.0 requires preservation of the copyright notice and disclaimer. Like other free software licenses, the license allows the user of the software the freedom 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. This makes the Apache License a FRAND-RF license. The ASF and its projects release the software they produce under the Apache License. The license is also used by many non-ASF projects.Apple Public Source License
The Apple Public Source License (APSL) is the open-source and free software license under which Apple's Darwin operating system was released. A free and open-source software license was voluntarily adopted to further involve the community from which much of Darwin originated.
The first version of the Apple Public Source License was approved by the Open Source Initiative (OSI). Version 2.0, released July 29, 2003, is also approved as a free software license by the Free Software Foundation (FSF) which finds it acceptable for developers to work on projects that are already covered by this license. However, the FSF recommends that developers should not release new projects under this license, because the partial copyleft is not compatible with the GNU General Public License and allows linking with files released entirely as proprietary software. The license does require that if any derivatives of the original source are released externally, their source should be made available; the Free Software Foundation compares this requirement to a similar one in its own GNU Affero General Public License.Many software releases from Apple have now been relicensed under the more liberal Apache License, such as the Bonjour Zeroconf stack.Eclipse Public License
The Eclipse Public License (EPL) is an open source software license used by the Eclipse Foundation for its software. It replaces the Common Public License (CPL) and removes certain terms relating to litigations related to patents.The Eclipse Public License is designed to be a business-friendly free software license, and features weaker copyleft provisions than licenses such as the GNU General Public License (GPL). The receiver of EPL-licensed programs can use, modify, copy and distribute the work and modified versions, in some cases being obligated to release their own changes.The EPL is approved by the Open Source Initiative (OSI) and is listed as a free software license by the Free Software Foundation (FSF).Discussion of a new version of the EPL began in May 2013. Version 2.0 was announced on 24 August 2017.Festival Speech Synthesis System
The Festival Speech Synthesis System is a general multi-lingual speech synthesis system originally developed by Alan W. Black at Centre for Speech Technology Research (CSTR) at the University of Edinburgh. Substantial contributions have also been provided by Carnegie Mellon University and other sites. It is distributed under a free software license similar to the BSD License.
It offers a full text to speech system with various APIs, as well as an environment for development and research of speech synthesis techniques. It is written in C++ with a Scheme-like command interpreter for general customization and extension.Festival is designed to support multiple languages, and comes with support for English (British and American pronunciation), Welsh, and Spanish. Voice packages exist for several other languages, such as Castilian Spanish, Czech, Finnish, Hindi, Italian, Marathi, Polish, Russian and Telugu.ISC license
The ISC license is a permissive free software license published by the Internet Software Consortium, nowadays called Internet Systems Consortium (ISC). It is functionally equivalent to the simplified BSD and MIT licenses, but without language deemed unnecessary following the Berne Convention.Originally used for ISC software such as BIND and dig, it has become the preferred license for contributions to OpenBSD and the default license for npm packages. The ISC license is also used for Linux wireless drivers contributed by Qualcomm Atheros.List of free electronics circuit simulators
Electronic circuit simulators distributed under a free software license are available from several sources and for several computing platforms.MIT License
The MIT License is a permissive free software license originating at the Massachusetts Institute of Technology (MIT). As a permissive license, it puts only very limited restriction on reuse and has, therefore, an excellent license compatibility. The MIT license permits reuse within proprietary software provided that all copies of the licensed software include a copy of the MIT License terms and the copyright notice. The MIT license is also compatible with many copyleft licenses, such as the GNU General Public License (GPL); MIT licensed software can be integrated into GPL software, but not the other way around.As of 2015, it was the most popular software license on GitHub, ahead of any GPL variant and other free and open-source software (FOSS) licenses. Notable projects that use one of the versions of the MIT License include Ruby on Rails, Node.js, jQuery, and the X Window System.Netscape Public License
The Netscape Public License (NPL) is a free software license, the license under which Netscape Communications Corporation originally released Mozilla.
Its most notable feature is that it gives the original developer of Mozilla (Netscape, now a subsidiary of AOL), the right to distribute modifications made by other contributors under whatever terms it desires, including proprietary terms, without granting similar rights to these other contributors in respect to contributions made by the original developer. This allowed the release of the Netscape 6 and later versions as proprietary software.
This asymmetry with respect to rights has led to criticism of the license by many members of the open source and free software movements: the Free Software Foundation acknowledged it as a free-software license but one to be avoided, and the Open Source Initiative either rejected it entirely or was not asked to review it. The FSF adds that it's not possible to combine software obtained under the license with software obtained under the GPL.The Mozilla Public License version 1.1 is similar (and has limited "file-level copyleft"), but lacks the asymmetry in rights. Time Warner, exercising its rights under the Netscape Public License, and at the request of the Mozilla Foundation, relicensed all code in Mozilla that was under the Netscape Public License (including code by other contributors) to an MPL 1.1/GPL 2.0/LGPL 2.1 tri-license, thus removing the GPL-incompatibility.OpenEXR
OpenEXR is a high dynamic range raster file format, released as an open standard along with a set of software tools created by Industrial Light & Magic (ILM), under a free software license similar to the BSD license.It is notable for supporting multiple channels of potentially different pixel sizes, including 64-, 32- and 16-bit floating point values, as well as various compression techniques which include lossless and lossy compression algorithms. It also has arbitrary channels and encodes multiple points of view such as left- and right-camera images.Permissive software license
A permissive software license, sometimes also called BSD-like or BSD-style license, is a free-software license with minimal requirements about how the software can be redistributed. Examples include the MIT License, BSD licenses, Apple Public Source License and the Apache license. As of 2016, the most popular free-software license is the permissive MIT license.Python License
The Python License is a deprecated computer software license created by the Corporation for National Research Initiatives (CNRI). It was used for versions 1.6 and 2.0 of the Python programming language, both released in the year 2000.
The Python License is similar to the BSD License and, while it is a free software license, its wording in some versions meant that it was incompatible with the GNU General Public License (GPL) used by a great deal of free software including the Linux kernel. For this reason CNRI retired the license in 2001, and the license of current releases is owned by the Python Software Foundation License.Python Software Foundation License
The Python Software Foundation License (PSFL) is a BSD-style, permissive free software license which is compatible with the GNU General Public License (GPL). Its primary use is for distribution of the Python project software. Unlike the GPL the Python license is not a copyleft license, and allows modified versions to be distributed without source code. The PSFL is listed as approved on both FSF's approved licenses list, and OSI's approved licenses list.
In 2000, Python was briefly available under the Python License, which is incompatible with the GPL. The reason given for this incompatibility by Free Software Foundation was that "this Python license is governed by the laws of the 'State of Virginia', in the USA", which the GPL does not permit.Guido van Rossum, Python's creator, was awarded the 2001 Free Software Foundation Award for the Advancement of Free Software for changing the license to fix this incompatibility.Skia Graphics Engine
The Skia Graphics Engine is a compact open-source graphics library written in C++. Skia Inc. originally developed the library; Google acquired it in 2005, and then released the software as open source licensed under the New BSD free software license.
Now known as Skia, the library is used as of 2017 in Google Chrome, Chrome OS, Chromium OS, Mozilla Firefox, Mozilla Thunderbird, Android (although partially superseded by HWUI starting with Android 3.0), Firefox OS, Flutter and Sublime Text 3. The Skia library is also present on the BlackBerry PlayBook, though the extent of its usage is unclear.
Skia has several back-ends, including one for CPU-based software rasterization, one for PDF output, and one for GPU-accelerated OpenGL. Partially implemented back-ends (which may lack some features) are also available for OpenGL ES, OpenVG, SVG, and Adobe SWF (Flash). Skia is most similar in purpose to Cairo (meaning that it focuses on drawing) rather than to other more elaborate infrastructures like Qt that provide their own widgets etc.Mark Kilgard and Jeff Bolz explain (and criticize) the internals of Skia (as of 2012) in the following terms:
Skia has a conventional CPU-based path renderer but has recently integrated a new OpenGL ES2-accelerated back-end called Ganesh. Ganesh has experimented with two accelerated approaches. The first used the stencil buffer to render paths. Because of API overheads with this approach, this first approach was replaced with a second approach where the CPU-based rasterizer computes a coverage mask which is loaded as a texture upon every path draw to provide the GPU proper antialiased coverage. This hybrid scheme is often bottlenecked by the dynamic texture updates required for every rendered path.
Since then, Skia has added support for the proposed NV path rendering OpenGL vendor extension (of which Kilgard is the lead author).Sleepycat License
The Sleepycat License (sometimes referred to as Berkeley database license where berkeley database is a library intended to provide a high performance embedded database for key/value data which is written in 'C' or the Sleepycat Public License) is a copyleft free software license used by Oracle Corporation for the open-source editions of Berkeley DB, Berkeley DB Java Edition and Berkeley DB XML embedded database products older than version 6.0.20. (Starting with version 6.0.20, the open-source editions are instead licensed under the GNU AGPL v3.)W3C Software Notice and License
The W3C Software Notice and License is a permissive free software license used by software released by the World Wide Web Consortium, like Amaya. The license is a permissive license, compatible with the GNU General Public License.WTFPL
WTFPL is a GPL-compatible permissive license most commonly used as a free software license. As a public domain like license, the WTFPL is essentially the same as dedication to the public domain. It allows redistribution and modification of the work under any terms. The title is an abbreviation of "Do what the fuck you want to Public License".
The first version of the WTFPL, released in March 2000, was written by Banlu Kemiyatorn for his own software project. Sam Hocevar, Debian's former project leader, wrote version 2.Zlib License
The zlib license is a permissive free software license which defines the terms under which the zlib software library can be distributed. It is also used by many other free software packages. The libpng library uses a similar license sometimes referred interchangeably as the zlib/libpng license.
The zlib license has been approved by the Free Software Foundation (FSF) as a free software license, and by the Open Source Initiative (OSI) as an open source license. It is compatible with the GNU General Public License.
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