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Licenses

Table of Contents

     * [45]Evaluating Licenses
     * [46]Common Resources for our Software Licenses
     * [47]The GNU General Public License
     * [48]The GNU Lesser General Public License
     * [49]The GNU Affero General Public License
     * [50]The GNU Free Documentation License
     * [51]Exceptions to GNU Licenses
     * [52]License URLs
     * [53]Unofficial Translations
     * [54]Verbatim Copying and Distribution
     * [55]List of Free Software Licenses
     * [56]What Is Copyleft?
     * [57]Licenses for Other Types of Works
     ____________________________________________________________________________

   Published software should be [58]free software. To make it free software, you
   need to release it under a free software license. We normally use the [59]GNU
   General Public License (GNU GPL), specifying version 3 or any later version, but
   occasionally we use [60]other free software licenses. We use only licenses that
   are compatible with the GNU GPL for GNU software.

   Documentation for free software should be [61]free documentation, so that people
   can redistribute it and improve it along with the software it describes. To make
   it free documentation, you need to release it under a free documentation license.
   We normally use the [62]GNU Free Documentation License (GNU FDL), but
   occasionally we use [63]other free documentation licenses.

   If you've started a new project and you're not sure what license to use, [64]"How
   to choose a license for your own work" details our recommendations in an
   easy-to-follow guide. If you just want a quick list reference, we have a page
   that names our [65]recommended copyleft licenses.

   We also have a page that discusses [66]the BSD License Problem.

Evaluating Licenses

   If you come across a license not mentioned in our [67]license list, you can ask
   us to evaluate whether it is a free license. Please email a copy of the license
   (and the URL where you found it) to [68]licensing@fsf.org. Our licensing experts
   in the staff and the board of directors will review it. If the license has some
   unusual conditions, they may pose difficult philosophical problems, so we can't
   promise to decide quickly.

Common Resources for our Software Licenses

   We have a number of resources to help people understand and use our various
   licenses:
     * [69]Frequently Asked Questions about the GNU licenses
     * [70]How to use GNU licenses for your own software
     * [71]What to do if you see a violation of a GNU license
     * [72]License Compatibility and Relicensing
     * [73]List of Free Software Licenses
     * [74]Releasing Free Software if you work at a university
     * [75]Why the FSF gets copyright assignments from contributors
     * [76]GNU license logos to use with your project
     * [77]The FSF Licensing & Compliance Lab
     * [78] for general licensing help

The GNU General Public License

   The GNU General Public License is often called the GNU GPL for short; it is used
   by most GNU programs, and by more than half of all free software packages. The
   latest version is version 3.
     * The GNU General Public License is available in these formats: [79]HTML,
       [80]plain text, [81]ODF, Docbook [82]v4 or [83]v5, [84]Texinfo, [85]LaTeX,
       [86]Markdown, and [87]RTF. These documents are not formatted for standalone
       publishing, and are intended to be included in another document.
     * [88]A Quick Guide to GPLv3
     * [89]Older versions of the GNU GPL

The GNU Lesser General Public License

   The GNU Lesser General Public License is used by a few (not by any means all) GNU
   libraries. The latest version is version 3.
     * The GNU Lesser General Public License text is available in these formats:
       [90]HTML, [91]plain text, [92]Docbook, [93]Texinfo, [94]Markdown, [95]ODF,
       and [96]RTF. These documents are not formatted for standalone publishing, and
       are intended to be included in another document.
     * [97]Why you shouldn't use the Lesser GPL for your next library
     * [98]Older versions of the GNU LGPL

The GNU Affero General Public License

   The GNU Affero General Public License is based on the GNU GPL, but has an
   additional term to allow users who interact with the licensed software over a
   network to receive the source for that program. We recommend that people consider
   using the GNU AGPL for any software which will commonly be run over a network.
   The latest version is version 3.
     * The GNU Affero General Public License text is available in these formats:
       [99]HTML, [100]plain text, [101]Docbook, [102]Texinfo, [103]LaTeX,
       [104]Markdown, [105]ODF, and [106]RTF. These documents are not formatted for
       standalone publishing, and are intended to be included in another document.
     * [107]Why the Affero GPL

The GNU Free Documentation License

   The GNU Free Documentation License is a form of copyleft intended for use on a
   manual, textbook or other document to assure everyone the effective freedom to
   copy and redistribute it, with or without modifications, either commercially or
   non-commercially. The latest version is 1.3.
     * The GNU Free Documentation License text is available in these formats:
       [108]HTML, [109]plain text, Docbook [110]v4 or [111]v5, [112]Texinfo,
       [113]LaTeX, [114]Markdown, [115]ODF, and [116]RTF. These documents are not
       formatted for standalone publishing, and are intended to be included in
       another document.
     * [117]Why publishers should use the GNU FDL
     * [118]How to use the GNU FDL for your documentation
     * [119]Tips on using the GNU FDL
     * [120]How to use the optional features of the GNU FDL
     * [121]Older versions of the GNU FDL

Exceptions to GNU Licenses

   Some GNU programs have additional permissions or special exceptions to specific
   terms in one of the main licenses. Since some of those are commonly used or
   inspire a lot of questions on their own, we've started collecting them on our
   [122]exceptions page.

License URLs

   When linking to our licenses, it's usually best to link to the latest version;
   hence the standard URLs such as https://www.gnu.org/licenses/gpl.html have no
   version number. Occasionally, however, you may want to link to a specific version
   of a given license. In those situations, you can use the following links
   [[123]skip links]:

   GNU General Public License (GPL)
          [124]GPLv3, [125]GPLv2, [126]GPLv1

   GNU Lesser General Public License (LGPL)
          [127]LGPLv3, [128]LGPLv2.1

   GNU Affero General Public License (AGPL)
          [129]GNU AGPLv3 (The [130]Affero General Public License version 1 is not a
          GNU license, but it was designed to serve a purpose much like the GNU
          AGPL's.)

   GNU Free Documentation License (FDL)
          [131]FDLv1.3, [132]FDLv1.2, [133]FDLv1.1

   Stable links to each license's alternative formats are available on its
   respective page. Not every version of every license is available in every format.
   If you need one that is missing, please [134]email us.

   See also the [135]old licenses page.

Unofficial Translations

   Legally speaking, the original (English) version of the licenses is what
   specifies the actual distribution terms for GNU programs and others that use
   them. But to help people better understand the licenses, we give others
   permission to publish unofficial translations into other languages, provided that
   they follow our regulations for unofficial translations.

   The FSF does not approve license translations as officially valid. The reason is
   that checking them would be difficult and expensive (needing the help of
   bilingual lawyers in other countries). Even worse, if an error did slip through,
   the results could be disastrous for the whole free software community. As long as
   the translations are unofficial, they can't do any legal harm.

   To underscore the fact that these translations are not officially valid, we do
   not publish translations. To make that clear, we don't post them on gnu.org, or
   on other GNU and FSF web sites; we only link to them.
     * [136]List of unofficial translations
     * [137]How to create an unofficial translation

Verbatim Copying and Distribution

   The standard copyright terms for GNU web pages is now the [138]Creative Commons
   Attribution-NoDerivs 4.0 International License. It used to be (and for a few
   pages still is):

     Verbatim copying and distribution of this entire article are permitted
     worldwide, without royalty, in any medium, provided this notice is preserved.

   Please note the following commentary about this "verbatim license" by Eben
   Moglen:

     "Our intention in using the phrase `verbatim copying in any medium' is not to
     require retention of page headings and footers or other formatting features.
     Retention of weblinks in both hyperlinked and non-hyperlinked media (as notes
     or some other form of printed URL in non-HTML media) is required".

List of Free Software Licenses

     * [139]List of Free Software Licenses
       If you are contemplating writing a new license, please contact the FSF by
       writing to [140]. The proliferation of different free
       software licenses means increased work for users in understanding the
       licenses; we may be able to help you find an existing Free Software license
       that meets your needs.
       If that isn't possible, if you really need a new license, with our help you
       can ensure that the license really is a Free Software license and avoid
       various practical problems.

What Is Copyleft?

   [141]Copyleft is a general method for making a program free software and
   requiring all modified and extended versions of the program to be free software
   as well.

   The simplest way to make a program free is to put it in the [142]public domain,
   uncopyrighted. This allows people to share the program and their improvements, if
   they are so minded. But it also allows uncooperative people to convert the
   program into [143]proprietary software. They can make changes, many or few, and
   distribute the result as a proprietary product. People who receive the program in
   that modified form do not have the freedom that the original author gave them;
   the middleman has stripped it away.

   In the [144]GNU project, our aim is to give all users the freedom to redistribute
   and change GNU software. If middlemen could strip off the freedom, we might have
   many users, but those users would not have freedom. So instead of putting GNU
   software in the public domain, we "copyleft" it. Copyleft says that anyone who
   redistributes the software, with or without changes, must pass along the freedom
   to further copy and change it. Copyleft guarantees that every user has freedom.

   Copyleft also provides an [145]incentive for other programmers to add to free
   software. Important free programs such as the GNU C++ compiler exist only because
   of this.

   Copyleft also helps programmers who want to contribute [146]improvements to
   [147]free software get permission to do that. These programmers often work for
   companies or universities that would do almost anything to get more money. A
   programmer may want to contribute her changes to the community, but her employer
   may want to turn the changes into a proprietary software product.

   When we explain to the employer that it is illegal to distribute the improved
   version except as free software, the employer usually decides to release it as
   free software rather than throw it away.

   To copyleft a program, we first state that it is copyrighted; then we add
   distribution terms, which are a legal instrument that gives everyone the rights
   to use, modify, and redistribute the program's code or any program derived from
   it but only if the distribution terms are unchanged. Thus, the code and the
   freedoms become legally inseparable.

   Proprietary software developers use copyright to take away the users' freedom; we
   use copyright to guarantee their freedom. That's why we reverse the name,
   changing "copyright" into "copyleft".

   Copyleft is a general concept; there are many ways to fill in the details. In the
   GNU Project, the specific distribution terms that we use are contained in the GNU
   General Public License, the GNU Lesser General Public License and the GNU Free
   Documentation License.

   The appropriate license is included in many manuals and in each GNU source code
   distribution.

   The GNU GPL is designed so that you can easily apply it to your own program if
   you are the copyright holder. You don't have to modify the GNU GPL to do this,
   just add notices to your program which refer properly to the GNU GPL. Please note
   that you must use the entire text of the GPL, if you use it. It is an integral
   whole, and partial copies are not permitted. (Likewise for the LGPL, AGPL, and
   FDL.)

   Using the same distribution terms for many different programs makes it easy to
   copy code between various different programs. Since they all have the same
   distribution terms, there is no need to think about whether the terms are
   compatible. The Lesser GPL includes a provision that lets you alter the
   distribution terms to the ordinary GPL, so that you can copy code into another
   program covered by the GPL.

Licenses for Other Types of Works

   We believe that published software and documentation should be [148]free software
   and free documentation. We recommend making all sorts of educational and
   reference works free also, using free documentation licenses such as the [149]GNU
   Free Documentation License (GNU FDL).

   For essays of opinion and scientific papers, we recommend either the
   [150]Creative Commons Attribution-NoDerivs 3.0 United States License, or the
   simple "verbatim copying only" license stated above.

   We don't take the position that artistic or entertainment works must be free, but
   if you want to make one free, we recommend the [151]Free Art License.
     ____________________________________________________________________________

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References

   1. http://www.gnu.org/licenses/licenses.html
   2. http://www.gnu.org/licenses/licenses.en.html
   3. http://www.gnu.org/licenses/licenses.ar.html
   4. http://www.gnu.org/licenses/licenses.ca.html
   5. http://www.gnu.org/licenses/licenses.de.html
   6. http://www.gnu.org/licenses/licenses.el.html
   7. http://www.gnu.org/licenses/licenses.es.html
   8. http://www.gnu.org/licenses/licenses.fr.html
   9. http://www.gnu.org/licenses/licenses.it.html
  10. http://www.gnu.org/licenses/licenses.ja.html
  11. http://www.gnu.org/licenses/licenses.nl.html
  12. http://www.gnu.org/licenses/licenses.pl.html
  13. http://www.gnu.org/licenses/licenses.pt-br.html
  14. http://www.gnu.org/licenses/licenses.ru.html
  15. http://www.gnu.org/licenses/licenses.sq.html
  16. http://www.gnu.org/licenses/licenses.sr.html
  17. http://www.gnu.org/licenses/licenses.tr.html
  18. http://www.gnu.org/licenses/licenses.zh-cn.html
  19. http://www.gnu.org/licenses/licenses.zh-tw.html
  20. http://www.gnu.org/licenses/licenses.html#content
  21. http://www.fsf.org/fss
  22. https://www.fsf.org/associate/support_freedom?referrer=4052
  23. http://www.gnu.org/
  24. http://www.gnu.org/licenses/licenses.html#mission-statement
  25. http://www.gnu.org/cgi-bin/estseek.cgi
  26. http://www.gnu.org/licenses/licenses.html#language-container
  27. http://www.gnu.org/licenses/licenses.html#navigation
  28. http://www.gnu.org/licenses/licenses.html#content
  29. http://www.gnu.org/gnu/gnu.html
  30. http://www.gnu.org/philosophy/philosophy.html
  31. http://www.gnu.org/licenses/licenses.html
  32. http://www.gnu.org/education/education.html
  33. http://www.gnu.org/software/software.html
  34. http://www.gnu.org/distros/distros.html
  35. http://www.gnu.org/doc/doc.html
  36. http://www.gnu.org/proprietary/proprietary.html
  37. http://www.gnu.org/help/help.html
  38. http://www.gnu.org/audio-video/audio-video.html
  39. http://www.gnu.org/graphics/graphics.html
  40. http://www.gnu.org/fun/humor.html
  41. http://www.gnu.org/people/people.html
  42. http://directory.fsf.org/
  43. https://h-node.org/
  44. http://www.gnu.org/server/sitemap.html
  45. http://www.gnu.org/licenses/licenses.html#Evaluation
  46. http://www.gnu.org/licenses/licenses.html#CommonResources
  47. http://www.gnu.org/licenses/licenses.html#GPL
  48. http://www.gnu.org/licenses/licenses.html#LGPL
  49. http://www.gnu.org/licenses/licenses.html#AGPL
  50. http://www.gnu.org/licenses/licenses.html#FDL
  51. http://www.gnu.org/licenses/licenses.html#Exceptions
  52. http://www.gnu.org/licenses/licenses.html#LicenseURLs
  53. http://www.gnu.org/licenses/licenses.html#UnofficialTransl
  54. http://www.gnu.org/licenses/licenses.html#VerbatimCopying
  55. http://www.gnu.org/licenses/licenses.html#FSLicenses
  56. http://www.gnu.org/licenses/licenses.html#WhatIsCopyleft
  57. http://www.gnu.org/licenses/licenses.html#OtherWorks
  58. http://www.gnu.org/philosophy/free-sw.html
  59. http://www.gnu.org/licenses/licenses.html#GPL
  60. http://www.gnu.org/licenses/license-list.html#SoftwareLicenses
  61. http://www.gnu.org/philosophy/free-doc.html
  62. http://www.gnu.org/licenses/licenses.html#FDL
  63. http://www.gnu.org/licenses/license-list.html#DocumentationLicenses
  64. http://www.gnu.org/licenses/license-recommendations.html
  65. http://www.gnu.org/licenses/recommended-copylefts.html
  66. http://www.gnu.org/licenses/bsd.html
  67. http://www.gnu.org/licenses/license-list.html
  68. mailto:licensing@fsf.org
  69. http://www.gnu.org/licenses/gpl-faq.html
  70. http://www.gnu.org/licenses/gpl-howto.html
  71. http://www.gnu.org/licenses/gpl-violation.html
  72. http://www.gnu.org/licenses/license-compatibility.html
  73. http://www.gnu.org/licenses/license-list.html
  74. http://www.gnu.org/philosophy/university.html
  75. http://www.gnu.org/licenses/why-assign.html
  76. http://www.gnu.org/graphics/license-logos.html
  77. https://www.fsf.org/licensing
  78. http://www.gnu.org/licenses/license-list.html#LicensingEmailAddress
  79. http://www.gnu.org/licenses/gpl.html
  80. http://www.gnu.org/licenses/gpl.txt
  81. http://www.gnu.org/licenses/gpl.odt
  82. http://www.gnu.org/licenses/gpl.dbk
  83. http://www.gnu.org/licenses/gpl.xml
  84. http://www.gnu.org/licenses/gpl.texi
  85. http://www.gnu.org/licenses/gpl.tex
  86. http://www.gnu.org/licenses/gpl.md
  87. http://www.gnu.org/licenses/gpl.rtf
  88. http://www.gnu.org/licenses/quick-guide-gplv3.html
  89. http://www.gnu.org/licenses/old-licenses/old-licenses.html#GPL
  90. http://www.gnu.org/licenses/lgpl.html
  91. http://www.gnu.org/licenses/lgpl.txt
  92. http://www.gnu.org/licenses/lgpl.dbk
  93. http://www.gnu.org/licenses/lgpl.texi
  94. http://www.gnu.org/licenses/lgpl.md
  95. http://www.gnu.org/licenses/lgpl.odt
  96. http://www.gnu.org/licenses/lgpl.rtf
  97. http://www.gnu.org/licenses/why-not-lgpl.html
  98. http://www.gnu.org/licenses/old-licenses/old-licenses.html#LGPL
  99. http://www.gnu.org/licenses/agpl.html
 100. http://www.gnu.org/licenses/agpl.txt
 101. http://www.gnu.org/licenses/agpl.dbk
 102. http://www.gnu.org/licenses/agpl.texi
 103. http://www.gnu.org/licenses/agpl.tex
 104. http://www.gnu.org/licenses/agpl.md
 105. http://www.gnu.org/licenses/agpl.odt
 106. http://www.gnu.org/licenses/agpl.rtf
 107. http://www.gnu.org/licenses/why-affero-gpl.html
 108. http://www.gnu.org/licenses/fdl.html
 109. http://www.gnu.org/licenses/fdl.txt
 110. http://www.gnu.org/licenses/fdl.xml
 111. http://www.gnu.org/licenses/fdl-db5.xml
 112. http://www.gnu.org/licenses/fdl.texi
 113. http://www.gnu.org/licenses/fdl.tex
 114. http://www.gnu.org/licenses/fdl.md
 115. http://www.gnu.org/licenses/fdl.odt
 116. http://www.gnu.org/licenses/fdl.rtf
 117. http://www.gnu.org/licenses/why-gfdl.html
 118. http://www.gnu.org/licenses/fdl.html#addendum
 119. http://www.gnu.org/licenses/fdl-howto.html
 120. http://www.gnu.org/licenses/fdl-howto-opt.html
 121. http://www.gnu.org/licenses/old-licenses/old-licenses.html#FDL
 122. http://www.gnu.org/licenses/exceptions.html
 123. http://www.gnu.org/licenses/licenses.html#urlskip
 124. http://www.gnu.org/licenses/gpl-3.0.html
 125. http://www.gnu.org/licenses/gpl-2.0.html
 126. http://www.gnu.org/licenses/gpl-1.0.html
 127. http://www.gnu.org/licenses/lgpl-3.0.html
 128. http://www.gnu.org/licenses/lgpl-2.1.html
 129. http://www.gnu.org/licenses/agpl-3.0.html
 130. https://web.archive.org/web/20190826200024/http://www.affero.org/oagpl.html
 131. http://www.gnu.org/licenses/fdl-1.3.html
 132. http://www.gnu.org/licenses/fdl-1.2.html
 133. http://www.gnu.org/licenses/fdl-1.1.html
 134. mailto:licensing@gnu.org
 135. http://www.gnu.org/licenses/old-licenses/
 136. http://www.gnu.org/licenses/translations.html
 137. http://www.gnu.org/licenses/translations.html#rules
 138. https://creativecommons.org/licenses/by-nd/4.0/
 139. http://www.gnu.org/licenses/license-list.html
 140. mailto:licensing@fsf.org
 141. http://www.gnu.org/licenses/copyleft.html
 142. http://www.gnu.org/philosophy/categories.html#PublicDomainSoftware
 143. http://www.gnu.org/philosophy/categories.html#ProprietarySoftware
 144. http://www.gnu.org/gnu/thegnuproject.html
 145. http://www.gnu.org/philosophy/pragmatic.html
 146. http://www.gnu.org/software/software.html#develop
 147. http://www.gnu.org/philosophy/free-sw.html
 148. http://www.gnu.org/philosophy/free-doc.html
 149. http://www.gnu.org/licenses/licenses.html#FDL
 150. https://creativecommons.org/licenses/by-nd/3.0/us/
 151. http://directory.fsf.org/wiki/License:Free-Art-L-v1.3
 152. http://www.gnu.org/licenses/licenses.html#top
 153. http://www.gnu.org/licenses/licenses.html#top
 154. http://www.gnu.org/server/select-language.html?callback=/licenses/licenses.html
 155. http://www.gnu.org/licenses/licenses.en.html
 156. http://www.gnu.org/licenses/licenses.ar.html
 157. http://www.gnu.org/licenses/licenses.ca.html
 158. http://www.gnu.org/licenses/licenses.de.html
 159. http://www.gnu.org/licenses/licenses.el.html
 160. http://www.gnu.org/licenses/licenses.es.html
 161. http://www.gnu.org/licenses/licenses.fr.html
 162. http://www.gnu.org/licenses/licenses.it.html
 163. http://www.gnu.org/licenses/licenses.ja.html
 164. http://www.gnu.org/licenses/licenses.nl.html
 165. http://www.gnu.org/licenses/licenses.pl.html
 166. http://www.gnu.org/licenses/licenses.pt-br.html
 167. http://www.gnu.org/licenses/licenses.ru.html
 168. http://www.gnu.org/licenses/licenses.sq.html
 169. http://www.gnu.org/licenses/licenses.sr.html
 170. http://www.gnu.org/licenses/licenses.tr.html
 171. http://www.gnu.org/licenses/licenses.zh-cn.html
 172. http://www.gnu.org/licenses/licenses.zh-tw.html
 173. http://www.gnu.org/licenses/licenses.html#header
 174. http://www.fsf.org/
 175. http://www.fsf.org/associate/support_freedom?referrer=4052
 176. http://donate.fsf.org/
 177. http://shop.fsf.org/
 178. mailto:gnu@gnu.org
 179. http://www.gnu.org/contact/
 180. mailto:webmasters@gnu.org
 181. http://www.gnu.org/server/standards/README.translations.html
 182. http://creativecommons.org/licenses/by-nd/4.0/
 183. http://www.fsf.org/about/dmca-notice