Comparison of free and open-source software licences

Short description: Wikimedia list article

This is a comparison of free and open-source software licences. The comparison only covers software licences with a linked article for details, approved by at least one expert group at the FSF, the OSI, the Debian project or the Fedora project. For a list of licences not specifically intended for software, see List of free content licences.

## Contents

* 1 FOSS licences
* 2 General comparison
* 3 Approvals
* 4 See also
* 5 References

## FOSS licences

FOSS stands for "Free and Open Source Software". There is no one universally agreed-upon definition of FOSS software and various groups maintain approved lists of licences. The Open Source Initiative (OSI) is one such organization keeping a list of open-source licences.[1] The Free Software Foundation (FSF) maintains a list of what it considers free.[2] FSF's free software and OSI's open-source licences together are called FOSS licences. There are licences accepted by the OSI which are not free as per the free software definition. The open source definition allows for further restrictions like price, type of contribution and origin of the contribution, e.g. the case of the NASA Open Source Agreement, which requires the code to be "original" work.[3][4] The OSI does not endorse FSF licence analysis (interpretation) as per their disclaimer.[5]

The FSF's Free Software definition focuses on the user's unrestricted rights to use a program, to study and modify it, to copy it, and redistribute it for any purpose, which are considered by the FSF the four essential freedoms.[6][7] The OSI's open-source criteria focuses on the availability of the source code and the advantages of an unrestricted and community driven development model.[8] Yet, many FOSS licences, like the Apache License, and all Free Software licences allow commercial use of FOSS components.[9]

## General comparison

For a simpler comparison across the most common licenses see free-software license comparison.

The following table compares various features of each license and is a general guide to the terms and conditions of each licence, based on seven subjects or categories. Recent tools like the European Commissions' Joinup Licensing Assistant,[10] makes possible the licenses selection and comparison based on more than 40 subjects or categories, with access to their SPDX identifier and full text. The table below lists the permissions and limitations regarding the following subjects:

* Linking \- linking of the licensed code with code licensed under a different licence (e.g. when the code is provided as a library)
* Distribution \- distribution of the code to third parties
* Modification \- modification of the code by a licensee
* Patent grant \- protection of licensees from patent claims made by code contributors regarding their contribution, and protection of contributors from patent claims made by licensees
* Private use \- whether modification to the code must be shared with the community or may be used privately (e.g. internal use by a corporation)
* Sublicensing \- whether modified code may be licensed under a different licence (for example a copyright) or must retain the same licence under which it was provided
* TM grant \- use of trademarks associated with the licensed code or its contributors by a licensee

Licence  | Author  | Latest version  | Publication date  | Linking  | Distribution  | Modification  | Patent grant  | Private use  | Sublicensing  | TM grant

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|  |  |  |  |  |  |  |  |  |
Academic Free License[11] | Lawrence E. Rosen | 3.0 | 2002 | Permissive | Permissive | Permissive | Yes | Yes | Permissive | No
Affero General Public License | Affero Inc | 2.0 | 2007 | Copylefted[12] | Copyleft except for the GNU AGPL[12] | Copyleft[12] | ? | Yes[12] | ? | ?
Apache License | Apache Software Foundation | 2.0 | 2004 | Permissive[13] | Permissive[13] | Permissive[13] | Yes[13] | Yes[13] | Permissive[13] | No[13]
Apple Public Source License | Apple Computer | 2.0 | 2003August 6, 2003 | Permissive | ? | Limited | ? | ? | ? | ?
Artistic License | Larry Wall | 2.0 | 2000 | With restrictions | With restrictions | With restrictions | No | Permissive | With restrictions | No
Beerware | Poul-Henning Kamp | 42 | 1987 | Permissive | Permissive | Permissive | No | Permissive | Permissive | No
BSD License | Regents of the University of California | 3.0 | ? | Permissive[14] | Permissive[14] | Permissive[14] | Manually[14] | Yes[14] | Permissive[14] | Manually[14]
Boost Software License | ? | 1.0 | 2003August 17, 2003 | Permissive | ? | Permissive | ? | ? | ? | ?
Creative Commons Zero | Creative Commons | 1.0 | 2009 | Public Domain[15][16] | Public Domain | Public Domain | No | Public Domain | Public Domain | No
CC BY | Creative Commons | 4.0 | 2002 | Permissive[17] | Permissive | Permissive | No | Yes | Permissive | No
CC BY-SA | Creative Commons | 4.0 | 2002 | Copylefted[17] | Copylefted | Copylefted | No | Yes | Copylefted[18] | No
CeCILL | CEA / CNRS / INRIA | 2.1 | 2005June 21, 2013 | Permissive | Permissive | Permissive | No | Permissive | With restrictions | No
Common Development and Distribution License | Sun Microsystems | 1.0 | 2004-12December 1, 2004 | Permissive | ? | Limited | ? | ? | ? | ?
Common Public License | IBM | 1.0 | 2001May 2001 | Permissive | ? | Copylefted | ? | ? | ? | ?
Cryptix General License | Cryptix Foundation | N/A | 1995 | Permissive | Permissive | Permissive | Manually | Yes | ? | Manually
Eclipse Public License | Eclipse Foundation | 2.0 | August 24, 2017 | Permissive[19] | Copylefted[19][20] | Copylefted[19] | Yes[19] | Yes[19] | Copylefted[19] | No[19]
Educational Community License | Indiana University[21] | 1.0 | 2007 | Permissive | ? | Permissive | ? | ? | ? | ?
European Union Public Licence | European Commission | 1.2 | 2009May 2017 | Permissive, according to EU law (Recitals 10 & 15 Directive 2009/24/EC) | Copylefted, with an explicit compatibility list[22] | Copylefted, with an explicit compatibility list[22] | Yes[23] | Yes[23] | Copylefted, with an explicit compatibility list[22] | No[23]
FreeBSD | The FreeBSD project | N/A | 1999April 1999 | Permissive[24] | Permissive[24] | Permissive[24] | Manually[24] | Permissive[24] | Permissive[24] | Manually[24]
GNU Affero General Public License | Free Software Foundation | 3.0 | 2007 | GNU GPLv3 only[25] | Copylefted[26] | Copylefted[26] | Yes[27] | No network usage[27] | Copylefted[26] | Yes[27]
GNU General Public License | Free Software Foundation | 3.0 | 2007June 2007 | GPLv3 compatible only[28][29] | Copylefted[26] | Copylefted[26] | Yes[30] | Yes[30] | Copylefted[26] | Yes[30]
GNU Lesser General Public License | Free Software Foundation | 3.0 | 2007June 2007 | With restrictions[31] | Copylefted[26] | Copylefted[26] | Yes[32] | Yes | Copylefted[26] | Yes[32]
IBM Public License | IBM | 1.0 | 1999August 1999 | Copylefted | ? | Copylefted | ? | ? | ? | ?
ISC license | Internet Systems Consortium | N/A | 2003June 2003 | Permissive | Permissive | Permissive | Manually | Permissive | Permissive | Manually
LaTeX Project Public License | LaTeX project | 1.3c | ? | Permissive | ? | Permissive | ? | ? | ? | ?
Microsoft Public License | Microsoft | N/A | ? | Copylefted | Copylefted | Copylefted | No | Permissive | ? | No
MIT license / X11 license | MIT | N/A | 1988 | Permissive[33] | Permissive[33] | Permissive[33] | Manually[33] | Yes[33] | Permissive[33] | Manually[33]
Mozilla Public License | Mozilla Foundation | 2.0 | 2012January 3, 2012 | Permissive[34] | Copylefted[34] | Copylefted[34] | Yes[34] | Yes[34] | Copylefted[34] | No[34]
Netscape Public License | Netscape | 1.1 | ? | Limited | ? | Limited | ? | ? | ? | ?
Open Software License[11] | Lawrence Rosen | 3.0 | 2005 | Permissive | Copylefted | Copylefted | Yes | Yes | Copylefted | ?
OpenSSL license | OpenSSL Project | N/A | ? | Permissive | ? | Permissive | ? | ? | ? | ?
PHP License[35] | PHP Group | 3.01 | 2019 | With restrictions | With restrictions | With restrictions | Yes | Yes | With restrictions | Manually
Python Software Foundation License | Python Software Foundation | 3.9.1 | 2020-10-05 | Permissive | Permissive | Permissive | Yes | Permissive | Permissive | No
Q Public License | Trolltech | ? | ? | Limited | ? | Limited | ? | ? | ? | ?
Sleepycat License | Sleepycat Software | N/A | 1996 | Permissive | With restrictions | Permissive | No | Yes | No | No
Unlicense | unlicense.org | 1 | 2010December 2010 | Permissive/Public domain | Permissive/Public domain | Permissive/Public domain | ? | Permissive/Public domain | Permissive/Public domain | ?
W3C Software Notice and License | W3C | 20021231 | 2002December 31, 2002 | Permissive | ? | Permissive | ? | ? | ? | ?
Do What The Fuck You Want To Public License (WTFPL) | Banlu Kemiyatorn, Sam Hocevar | 2 | 2004December 2004 | Permissive/Public domain | Permissive/Public domain | Permissive/Public domain | No | Yes | Yes | No
XCore Open Source License
also separate "Hardware License Agreement" | XMOS | ? | 2011February 2011 | Permissive | Permissive | Permissive | Manually | Yes | Permissive | ?
XFree86 1.1 License | The XFree86 Project, Inc | ? | ? | Permissive | ? | Permissive | ? | ? | ? | ?
zlib/libpng license | Jean-Loup Gailly and Mark Adler | ? | ? | Permissive | ? | Permissive | ? | ? | ? | ?

Other licences that don't have information:

Licence  | Author  | Latest version  | Publication date

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|  |  |
Eiffel Forum License | NICE | 2 | 2002
Intel Open Source License | Intel Corporation | N/A | ?
RealNetworks Public Source License | RealNetworks | ? | ?
Reciprocal Public License | Scott Shattuck | 1.5 | 2007
Sun Industry Standards Source License | Sun Microsystems | ? | ?
Sun Public License | Sun Microsystems | ? | ?
Sybase Open Watcom Public License | Open Watcom | N/A | 2003-01-28
Zope Public License | Zope Foundation | 2.1 | ?
Elastic License 2.0 (ELv2) | Elastic.co | 2.0 | ?
Server Side Public License | MongoDB | 1.0 | 2018-10-16

## Approvals

This table lists for each licence what organizations from the FOSS community have approved it - be it as a "free software" or as an "open source" licence - , how those organizations categorize it, and the licence compatibility between them for a combined or mixed derivative work. Organizations usually approve specific versions of software licences. For instance, a FSF approval means that the Free Software Foundation (FSF) considers a licence to be free software licence. The FSF recommends at least "Compatible with GPL" and preferably copyleft. The OSI recommends a mix of permissive and copyleft licences, the Apache License 2.0, 2- & 3-clause BSD license, GPL, LGPL, MIT license, MPL 2.0, CDDL and EPL.

Licence and version  | FSF approval
[36] | GPL (v3) compatibility
[37][38][39][40][41] | OSI approval
[42] | Debian approval
[43][44] | Fedora approval
[45]

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Academic Free License | Yes | No | Yes | No | Yes
Affero General Public License 3.0 | Yes | Yes | Yes | Yes | Yes
Apache License 1.x | Yes | No | Yes | Yes | Yes
Apache License 2.0 | Yes | GPLv3 only[46] | Yes | Yes | Yes
Apple Public Source License 1.x | No[47] | No | Yes | No | No
Apple Public Source License 2.0 | Yes | No | Yes | No | Yes
Artistic License 1.0 | No[note 1] | No | Yes | Yes | No
Artistic License 2.0 | Yes | Yes | Yes | Yes | Yes
Beerware License | see "informal licence" section[48] | see "informal license" section[48] | No | No | Yes[49]
Original BSD license | Yes | No | No[50] | Yes | Yes
Revised BSD license | Yes | Yes | Yes | Yes | Yes
Simplified BSD license | Yes | Yes | Yes | Yes | Yes
Zero-Clause BSD License | ? | ? | Yes[51] | ? | ?
Boost Software License | Yes | Yes | Yes | Yes | Yes
CeCILL | Yes | Yes | Yes | Yes | Yes
Common Public License | Yes | No | Yes | Yes | Yes
Creative Commons Zero | Yes[52] | Yes[52] | No[53] | Partial[54][55] | Yes[56]
Creative Commons BY-SA 4.0 | Yes | GPLv3[57] | ? | Yes | ?
Cryptix General License | Yes | Yes | Yes | Yes | Yes
Eclipse Public License | Yes | No | Yes | Yes | Yes
Educational Community License | Yes | Yes[58] | Yes | No | Yes
Eiffel Forum License 2 | Yes | Yes | Yes | Yes | Yes
European Union Public Licence | Yes | Yes[22] | Yes | Yes | Yes
GNU Affero General Public License | Yes | Yes[25][59] | Yes | Yes | Yes
GNU General Public License v2 | Yes | No[note 2][60] | Yes | Yes | Yes
GNU General Public License v3 | Yes | Yes[note 3][60] | Yes | Yes | Yes
GNU Lesser General Public License | Yes | Yes | Yes | Yes | Yes
GNU Free Documentation License | Yes | No[61] | Yes[62] | No[63] | No
IBM Public License | Yes | No | Yes | Yes | Yes
Intel Open Source License | Yes | Yes | Yes | No | No
ISC license | Yes[64] | Yes | Yes | Yes | Yes
LaTeX Project Public License | Yes | No | Yes | Yes | Yes
Microsoft Public License | Yes | No | Yes | No | Yes
Microsoft Reciprocal License | Yes | No | Yes | No | Yes
MIT license / X11 license | Yes | Yes | Yes | Yes | Yes
Mozilla Public License 1.1 | Yes | No | Yes | Yes | Yes
Mozilla Public License 2.0 | Yes | Yes[note 4][65] | Yes | Yes | Yes
NASA Open Source Agreement | No | No | Yes | ? | No
Netscape Public License | Yes | No | No | No | Yes
Open Software License | Yes | No | Yes | No | Yes
OpenSSL license | Yes | No | No | Yes | Yes
PHP License | Yes | No | Yes | Yes | Yes
Python Software Foundation License 2.0.1; 2.1.1 and newer | Yes | Yes | Yes | Yes | Yes
Q Public License | Yes | No | Yes | No | Yes
Reciprocal Public License 1.5 | No | No | Yes | No | No
Sleepycat License | Yes | Yes | Yes | Yes | Yes
Sun Industry Standards Source License | Yes | No | Yes | No | Yes
Sun Public License | Yes | No | Yes | No | Yes
Sybase Open Watcom Public License | No | No | Yes | No | No
Unlicense | Yes[66] | Yes[52] | Yes[67] | ? | Yes[56]
W3C Software Notice and License | Yes | Yes | Yes | Yes | Yes
Do What The Fuck You Want To Public License (WTFPL) | Yes[note 5] | Yes | No[68] | Yes | Yes
XFree86 1.1 License | Yes | Yes[69] | No | No | No
zlib/libpng license | Yes | Yes | Yes | Yes | Yes
Zope Public License 1.0 | Yes | No | No | No | Yes
Zope Public License 2.0 | Yes | Yes | Yes | No | Yes

1. ↑ The original version of the Artistic License is defined as non-free because it is overly vague, not because of the substance of the licence. The FSF encourages projects to use the Clarified Artistic License instead.
2. ↑ But can be made compatible by upgrading to GPLv3 via the optional "or later" clause added in most GPLv2 license texts.
3. ↑ But not with GPLv2 without "or later" clause.
4. ↑ MPL 2.0 is GPL compatible unless marked "Incompatible with Secondary Licenses".
5. ↑ Listed as WTFPL.

## See also

* Free software
* Free software license
* Open-source license
* Open-source software
* Source-available software

## References

1. ↑ Open source licenses - Licenses by Name on opensource.org
2. ↑ "Various Licenses and Comments about Them". https://www.gnu.org/licenses/license-list.html.
3. ↑ "Various Licenses and Comments about Them: NASA Open Source Agreement". https://www.gnu.org/licenses/license-list.en.html#NASA.
4. ↑ "Licenses by Name". https://opensource.org/licenses/alphabetical.
5. ↑ "Other Resources & Disclaimer". https://opensource.org/node/778. "While the OSI acknowledges these as potentially helpful resources for the community, it does not endorse any content, contributors or license interpretations from these websites.[...]The OSI does not promote or exclusively favor any of the above resources, but instead mentions them as a neutral, separate third-party."
6. ↑ "Relationship between the Free Software movement and Open Source movement", Free Software Foundation, Inc
7. ↑ "What is Free Software", Free Software Foundation, Inc
8. ↑ opensource.org/about "Open source is a development method for software that harnesses the power of distributed peer review and transparency of process. The promise of open source is better quality, higher reliability, more flexibility, lower cost, and an end to predatory vendor lock-in."
9. ↑ Popp, Dr. Karl Michael (2015). Best Practices for commercial use of open source software. Norderstedt, Germany: Books on Demand. ISBN 978-3738619096.
10. ↑ "Joinup Licensing Assistant". https://joinup.ec.europa.eu/solution/joinup-licensing-assistant/joinup-licensing-assistant-jla.
11. ↑ 11.0 11.1 "OSL 3.0 Explained". http://rosenlaw.com/OSL3.0-explained.htm.
12. ↑ 12.0 12.1 12.2 12.3 "affero.org: Affero General Public License version 2 (AGPLv2)". http://www.affero.org/agpl2.html.
13. ↑ 13.0 13.1 13.2 13.3 13.4 13.5 13.6 "the section 4 of the apache license version 2". https://www.apache.org/licenses/LICENSE-2.0.html#redistribution.
14. ↑ 14.0 14.1 14.2 14.3 14.4 14.5 14.6 "BSD license". http://opensource.org/licenses/BSD-3-Clause.
15. ↑ "Using CC0 for public domain software". Creative Commons. April 15, 2011. https://creativecommons.org/weblog/entry/27081.
16. ↑ "Various Licenses and Comments about Them". GNU Project. https://www.gnu.org/licenses/license-list.html.
17. ↑ 17.0 17.1 cc-by-4-0-and-cc-by-sa-4-0-added-to-our-list-of-free-licenses (2015)
18. ↑ "Compatible Licenses". Creative Commons. https://creativecommons.org/share-your-work/licensing-considerations/compatible-licenses/.
19. ↑ 19.0 19.1 19.2 19.3 19.4 19.5 19.6 "Eclipse Public License - v 2.0". https://www.eclipse.org/legal/epl-2.0/.
20. ↑ "How to Use Popular Open Source Licenses, Explained". https://www.capitalone.com/tech/open-source/open-source-licenses-explained-2021/.
21. ↑ Greenstein, Daniel; Wheeler, Brad (1 March 2007). Open Source Collaboration in Higher Education: Guidelines and Report of the Licensing and Policy Framework Summit for Software Sharing in Higher Education. https://scholarworks.iu.edu/dspace/handle/2022/3076.
22. ↑ 22.0 22.1 22.2 22.3 "EUPL compatible open source licences". https://joinup.ec.europa.eu/collection/eupl/eupl-compatible-open-source-licences.
23. ↑ 23.0 23.1 23.2 "EUPL text (1.1 & 1.2)". https://joinup.ec.europa.eu/collection/eupl/eupl-text-11-12.
24. ↑ 24.0 24.1 24.2 24.3 24.4 24.5 24.6 "FreeBSD license". https://www.freebsd.org/copyright/freebsd-license.html.
25. ↑ 25.0 25.1 [1]: section 13 of the GNU AGPLv3 license
26. ↑ 26.0 26.1 26.2 26.3 26.4 26.5 26.6 26.7 26.8 [2]: GNU licenses copyleft
27. ↑ 27.0 27.1 27.2 "the GNU Affero General Public License version 3". https://www.gnu.org/licenses/agpl-3.0.html.
28. ↑ [3]: If library is under GPLv3
29. ↑ [4]: Linking with the GNU GPLv3
30. ↑ 30.0 30.1 30.2 "the GNU General Public License version 3". https://www.gnu.org/licenses/gpl.html.
31. ↑ [5]: the section 4 of the GNU Lesser General Public License version 3
32. ↑ 32.0 32.1 "the GNU Lesser General Public License version 3". https://www.gnu.org/licenses/lgpl.html.
33. ↑ 33.0 33.1 33.2 33.3 33.4 33.5 33.6 "MIT License". http://opensource.org/licenses/MIT.
34. ↑ 34.0 34.1 34.2 34.3 34.4 34.5 34.6 "MPL version 2". https://www.mozilla.org/MPL/2.0.
35. ↑ "PHP Licence 3.01". https://www.php.net/license/3_01.txt.
36. ↑ Free Software Foundation. "Various Licenses and Comments about Them". Licenses. Free Software Foundation. https://www.gnu.org/licenses/license-list.html.
37. ↑ Free Software Foundation. "To be GPL-Compatible has to be compatible with Licenses GNU GPLv3 and GNU GPLv2 – Free Software Foundation". Software Licenses. Free Software Foundation. https://www.gnu.org/licenses/license-list.html#Introduction.
38. ↑ Free Software Foundation. "GPL-Compatible Free Software Licenses – Free Software Foundation". Software Licenses. Free Software Foundation. https://www.gnu.org/licenses/license-list.html#GPLCompatibleLicenses.
39. ↑ Free Software Foundation. "GPL-Incompatible Free Software Licenses – Free Software Foundation". Software Licenses. Free Software Foundation. https://www.gnu.org/licenses/license-list.html#GPLIncompatibleLicenses.
40. ↑ Free Software Foundation. "GPL-compatible Definition by FSF – Free Software Foundation". GPL-compatible Definition. Free Software Foundation. http://gplv3.fsf.org/wiki/index.php/FAQ_Update#What_does_it_mean_to_say_a_license_is_.22compatible_with_the_GPL.22.3F.
41. ↑ Free Software Foundation. "GPL-compatible Definition previous version by FSF – Free Software Foundation". GPL-compatible Definition. Free Software Foundation. https://www.gnu.org/licenses/gpl-faq.html#WhatDoesCompatMean.
42. ↑ Open Source Initiative. "The Approved Licenses". License Information. Open Source Initiative. http://www.opensource.org/licenses/.
43. ↑ Debian. "Debian – License information". Licenses. Debian. http://www.debian.org/legal/licenses/.
44. ↑ "The DFSG and Software Licenses". Debian wiki. http://wiki.debian.org/DFSGLicenses.
45. ↑ Fedora. "Licensing – FedoraProject". Licenses. Fedora Project. http://fedoraproject.org/wiki/Licensing.
46. ↑ Free Software Foundation. "Apache License, Version 2.0". Licenses. Free Software Foundation. https://www.gnu.org/philosophy/license-list.html#apache2.
47. ↑ "Apple Public Source License (APSL), version 1.x". https://www.gnu.org/licenses/license-list.html#apsl1.
48. ↑ 48.0 48.1 "Various Licenses and Comments about Them". Free Software Foundation. 2016-01-05. https://www.gnu.org/licenses/license-list.html#informal.
49. ↑ "Licensing/Beerware". Fedora Project. https://fedoraproject.org/wiki/Licensing/Beerware.
50. ↑ "The BSD License:Licensing". Open Source Initiative. http://www.opensource.org/licenses/bsd-license.php.
51. ↑ "[License-review Please rename "Free Public License-1.0.0" to 0BSD."]. Open Source Initiative. http://lists.opensource.org/pipermail/license-review_lists.opensource.org/2018-November/003830.html.
52. ↑ 52.0 52.1 52.2 "Various Licenses and Comments about Them - GNU Project - Free Software Foundation". https://www.gnu.org/licenses/license-list.en.html#CC0.
53. ↑ "Frequently Answered Questions". opensource.org. http://opensource.org/faq#cc-zero. ""CC0 was not explicitly rejected, but the License Review Committee was unable to reach consensus that it should be approved""
54. ↑ "Re: Creative Commons CC0". https://lists.debian.org/debian-legal/2009/03/msg00078.html.
55. ↑ "License information". http://www.debian.org/legal/licenses/.
56. ↑ 56.0 56.1 "Licensing:Main". https://fedoraproject.org/wiki/Licensing:Main?rd=Licensing#Good_Licenses.
57. ↑ "Creative Commons BY-SA 4.0 declared one-way compatible with GNU GPL version 3 — Free Software Foundation — working together for free software". https://www.fsf.org/blogs/licensing/creative-commons-by-sa-4-0-declared-one-way-compatible-with-gnu-gpl-version-3.
58. ↑ Free Software Foundation. "Educational Community License 2.0". Licenses. Free Software Foundation. https://www.gnu.org/philosophy/license-list.html#ECL2.0.
59. ↑ [6]: "We use only licenses that are compatible with the GNU GPL for GNU software."
60. ↑ 60.0 60.1 "Frequently Asked Questions about the GNU Licenses – Is GPLv3 compatible with GPLv2?". gnu.org. https://www.gnu.org/licenses/gpl-faq.html#v2v3Compatibility. "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."
61. ↑ [7]
62. ↑ [8]
63. ↑ "General Resolution: Why the GNU Free Documentation License is not suitable for Debian main". https://www.debian.org/vote/2006/vote_001.
64. ↑ Free Software Foundation. "A Quick Guide to GPLv3". Licenses. Free Software Foundation. http://www.fsf.org/licensing/licenses/quick-guide-gplv3.html#new-compatible-licenses.
65. ↑ Mozilla Foundation. "MPL 2.0 FAQ". Licenses. Mozilla Foundation. https://www.mozilla.org/MPL/2.0/FAQ.html.
66. ↑ "Various Licenses and Comments about Them - GNU Project - Free Software Foundation". https://www.gnu.org/licenses/license-list.en.html#Unlicense.
67. ↑ "[License-review Request for legacy approval: The Unlicense"]. http://lists.opensource.org/pipermail/license-review_lists.opensource.org/2020-June/004890.html.
68. ↑ "OSI Board Meeting Minutes, Wednesday, March 4, 2009". http://www.opensource.org/minutes20090304.
69. ↑ Free Software Foundation. "XFree86 1.1 License". Licenses. Free Software Foundation. https://www.gnu.org/philosophy/license-list.html#XFree861.1License.

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