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+
+<h2>Licenses</h2>
+
+<p>
+Published software should be <a href="/philosophy/free-sw.html">free
+software</a>. To make it free software, you need to release it
+under a free software license. We normally use the <a
+href="#GPL">GNU General Public License</a> (GNU GPL),
+but occasionally we use <a href="/licenses/license-list.html#SoftwareLicenses">other
+free software licenses</a>. We use only licenses that are compatible
+with the GNU GPL for GNU software.
+</p>
+
+<p>
+Documentation for free software should be
+<a href="/philosophy/free-doc.html">free documentation</a>, 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
+<a href="#FDL">GNU Free Documentation License</a> (GNU
+FDL), but occasionally we use
+<a href="/licenses/license-list.html#DocumentationLicenses">other free
+documentation licenses</a>.
+</p>
+
+<p>If you've started a new project and you're not sure what license to
+use, <a href="/licenses/license-recommendations.html">“How to
+choose a license for your own work”</a> details our
+recommendations in an easy-to-follow guide. If you just want a quick
+list reference, we have a page that names
+our <a href="/licenses/recommended-copylefts.html">recommended
+copyleft licenses</a>.</p>
+
+<p>We also have a page that discusses <a href="/philosophy/bsd.html">the BSD License Problem</a>.</p>
+
+<h3>Evaluating Licenses</h3>
+
+<p>If you come across a license not mentioned in our
+<a href="/licenses/license-list.html">license list</a>, 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 <a href="mailto:licensing@fsf.org">licensing@fsf.org</a>. 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.</p>
+
+<h3>Common Resources for our Software Licenses</h3>
+
+<p>We have a number of resources to help people understand and use our
+various licenses:</p>
+
+<ul>
+
+ <li><a href="/licenses/gpl-faq.html">Frequently Asked
+ Questions about the GNU licenses</a></li>
+ <li><a href="/licenses/gpl-howto.html">How to use GNU licenses for your
+ own software</a></li>
+ <li><a href="/licenses/gpl-violation.html">What to do if you see a
+ violation of a GNU license</a></li>
+ <li><a href="/licenses/license-list.html">List of Free Software Licenses</a></li>
+ <li><a href="/philosophy/university.html">Releasing Free Software if
+ you work at a university</a></li>
+ <li><a href="/licenses/why-assign.html">Why the FSF gets copyright
+ assignments from contributors</a></li>
+ <li><a href="/graphics/license-logos.html">GNU license logos</a> to use
+ with your project</li>
+ <li><a href="http://www.fsf.org/licensing">The FSF Licensing & Compliance Lab</a></li>
+ <li><a
+href="/licenses/license-list.html#LicensingEmailAddress"><licensing@fsf.org></a> for general licensing help
+ </li>
+
+</ul>
+
+<h3 id="GPL">The GNU General Public License</h3>
+
+<p>
+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.
+</p>
+
+<ul>
+ <li>The GNU General Public License is available in these formats:
+ <a href="/licenses/gpl.html">HTML</a>,
+ <a href="/licenses/gpl.txt">plain text</a>,
+ <a href="/licenses/gpl.odt">ODF</a>,
+ <a href="/licenses/gpl.dbk">Docbook</a>,
+ <a href="/licenses/gpl.texi">Texinfo</a>, and
+ <a href="/licenses/gpl.tex">LaTeX</a>.
+These documents are not formatted for standalone publishing, and
+are intended to be included in another document.</li>
+ <li><a href="/licenses/quick-guide-gplv3.html">A Quick Guide to
+ GPLv3</a></li>
+ <li><a href="/licenses/old-licenses/old-licenses.html#GPL">Older
+ versions of the GNU GPL</a></li>
+</ul>
+
+<h3 id="LGPL">The GNU Lesser General Public License</h3>
+
+<p>
+The GNU Lesser General Public License is used by a few (not by any means
+all) GNU libraries. The latest version is version 3.
+</p>
+
+<ul>
+ <li>The GNU Lesser General Public License text is available in
+ these formats:
+ <a href="/licenses/lgpl.html">HTML</a>,
+ <a href="/licenses/lgpl.txt">plain text</a>,
+ <a href="/licenses/lgpl.dbk">Docbook</a>, and
+ <a href="/licenses/lgpl.texi">Texinfo</a>.
+These documents are not formatted for standalone publishing, and
+are intended to be included in another document.</li>
+ <li><a href="/licenses/why-not-lgpl.html">Why you shouldn't use
+ the Lesser GPL for your next library</a></li>
+ <li><a href="/licenses/old-licenses/old-licenses.html#LGPL">Older
+ versions of the GNU LGPL</a></li>
+</ul>
+
+<h3 id="AGPL">The GNU Affero General Public License</h3>
+
+<p>
+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.
+</p>
+
+<ul>
+ <li>The GNU Affero General Public License text is available in
+ these formats:
+ <a href="/licenses/agpl.html">HTML</a>,
+ <a href="/licenses/agpl.txt">plain text</a>,
+ <a href="/licenses/agpl.dbk">Docbook</a>,
+ <a href="/licenses/agpl.texi">Texinfo</a>, and
+ <a href="/licenses/agpl.tex">LaTeX</a>.
+These documents are not formatted for standalone publishing, and
+are intended to be included in another document.</li>
+ <li><a href="/licenses/why-affero-gpl.html">Why the Affero GPL</a></li>
+</ul>
+
+<h3 id="FDL">The GNU Free Documentation License</h3>
+
+<p>
+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.
+</p>
+
+<ul>
+ <li>The GNU Free Documentation License text is available in these formats:
+ <a href="/licenses/fdl.html">HTML</a>,
+ <a href="/licenses/fdl.txt">plain text</a>,
+ <a href="/licenses/fdl.xml">Docbook</a>,
+ <a href="/licenses/fdl.texi">Texinfo</a>, and
+ <a href="/licenses/fdl.tex">LaTeX</a>.
+These documents are not formatted for standalone publishing, and
+are intended to be included in another document.</li>
+ <li><a href="/licenses/why-gfdl.html">Why publishers should use
+ the GNU FDL</a></li>
+ <li><a href="/licenses/fdl.html#addendum">How to use
+ the GNU FDL for your documentation</a></li>
+ <li><a href="/licenses/fdl-howto.html">Tips on using the GNU FDL</a></li>
+ <li><a href="/licenses/fdl-howto-opt.html">How to use the optional
+ features of the GNU FDL</a></li>
+ <li><a href="/licenses/old-licenses/old-licenses.html#FDL">
+ Older versions of the GNU FDL</a></li>
+</ul>
+
+<h3 id="Exceptions">Exceptions to GNU Licenses</h3>
+
+<p>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 <a href="/licenses/exceptions.html">exceptions page</a>.</p>
+
+<h3 id="LicenseURLs">License URLs</h3>
+
+<p>When linking to our licenses, it's usually best to link to the latest
+version; hence the standard URLs such as
+<tt>http://www.gnu.org/licenses/gpl.html</tt> 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
+[<a href="#urlskip">skip links</a>]:</p>
+
+<dl>
+<dt>GNU General Public License (GPL)</dt>
+<!-- Please keep these links absolute. I'm depending on that for the
+ XSLT to generate pages on fsf.org. Thanks. -brett -->
+<dd><a href="http://www.gnu.org/licenses/gpl-3.0.html">GPLv3</a>,
+<a href="http://www.gnu.org/licenses/gpl-2.0.html">GPLv2</a>,
+<a href="http://www.gnu.org/licenses/gpl-1.0.html">GPLv1</a></dd>
+
+<dt>GNU Lesser General Public License (LGPL)</dt>
+<dd><a href="http://www.gnu.org/licenses/lgpl-3.0.html">LGPLv3</a>,
+<a href="http://www.gnu.org/licenses/lgpl-2.1.html">LGPLv2.1</a></dd>
+
+<dt>GNU Affero General Public License (AGPL)</dt>
+<dd><a href="http://www.gnu.org/licenses/agpl-3.0.html">GNU
+ AGPLv3</a> (The <a
+ href="http://www.affero.org/oagpl.html">Affero General
+ Public License version 1</a> is not a GNU license, but it was
+ designed to serve a purpose much like the GNU AGPL's.)</dd>
+
+<dt>GNU Free Documentation License (FDL)</dt>
+<dd><a href="http://www.gnu.org/licenses/fdl-1.3.html">FDLv1.3</a>,
+<a href="http://www.gnu.org/licenses/fdl-1.2.html">FDLv1.2</a>,
+<a href="http://www.gnu.org/licenses/fdl-1.1.html">FDLv1.1</a></dd>
+</dl>
+
+<p><a name="urlskip"></a>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 <a href="mailto:licensing@gnu.org">email us</a>.</p>
+
+<p>See also the <a href="old-licenses/">old licenses page</a>.</p>
+
+
+<h3>Unofficial Translations</h3>
+
+<p>
+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
+permission to publish translations into other languages provided that
+they follow our regulations for unofficial translations:
+</p>
+
+<ul>
+ <li>
+ <a href="/licenses/translations.html">List of unofficial translations</a>
+ </li>
+ <li><a href="/licenses/translations.html#rules">How to create an unofficial
+ translation</a></li>
+</ul>
+
+<h3 id="VerbatimCopying">Verbatim Copying and Distribution</h3>
+
+<p>The standard copyright terms for GNU web pages is now the <a
+href="http://creativecommons.org/licenses/by-nd/3.0/us/">Creative
+Commons Attribution-NoDerivs 3.0 United States License</a>. It used to
+be (and for a few pages still is): <em><span class="highlight">Verbatim
+copying and distribution of this entire article are permitted worldwide,
+without royalty, in any medium, provided this notice is
+preserved</span>.</em> Please note the following commentary about this
+“verbatim license” by Eben Moglen:</p>
+
+<p>
+“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”.
+</p>
+
+<h3>List of Free Software Licenses</h3>
+
+<ul>
+ <li>
+ <a href="/licenses/license-list.html">List of Free Software Licenses</a>
+
+<p> If you are contemplating writing a new license, please contact the
+FSF by writing to <a
+href="mailto:licensing@fsf.org"><licensing@fsf.org></a>. 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.
+</p>
+
+<p>
+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.
+</p>
+
+ </li>
+ </ul>
+
+
+<h3 id="WhatIsCopyleft">What Is Copyleft?</h3>
+
+<p>
+<a href="/copyleft/copyleft.html"><em>Copyleft</em></a> 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.
+</p>
+
+<p>
+The simplest way to make a program free is to put it in the
+<a href="/philosophy/categories.html#PublicDomainSoftware">public
+domain</a>, 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
+<a href="/philosophy/categories.html#ProprietarySoftware">proprietary
+software</a>. 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.
+</p>
+
+<p>
+In the <a href="/gnu/thegnuproject.html">GNU project</a>, our aim is
+to give <em>all</em> 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.
+</p>
+
+<p>
+Copyleft also provides an
+<a href="/philosophy/pragmatic.html">incentive</a>
+for other programmers to add to free software.
+Important free programs such as the GNU C++ compiler exist
+only because of this.
+</p>
+
+<p>
+Copyleft also helps programmers who want to contribute
+<a href="/software/software.html#develop">improvements</a> to
+<a href="/philosophy/free-sw.html">free software</a> 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.
+</p>
+
+<p>
+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.
+</p>
+
+<p>
+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 <em>or any program derived from it</em> but only if the
+distribution terms are unchanged. Thus, the code and the freedoms
+become legally inseparable.
+</p>
+
+<p>
+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”.
+</p>
+
+<p>
+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.
+</p>
+
+<p>
+The appropriate license is included in many manuals and in each GNU
+source code distribution.
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+Using the same distribution terms for many different programs makes it
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+<p>Copyright © 2014, 2015 Free Software Foundation, Inc.</p>
+
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+<!-- end of server/bottom-notes.html -->
+
+
+<p class="unprintable">Updated:
+<!-- timestamp start -->
+$Date: 2015/06/12 21:55:19 $
+<!-- timestamp end -->
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