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class="noprint">From Wiktionary, the free dictionary</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><p>The <b>GNU Free Documentation License</b> (GFDL) is a <a href="https://en.wikipedia.org/wiki/copyleft" class="extiw" title="w:copyleft">copyleft</a> license for free documentation, designed by the <a href="https://en.wikipedia.org/wiki/Free_Software_Foundation" class="extiw" title="w:Free Software Foundation">Free Software Foundation</a> (FSF) for the <a href="https://en.wikipedia.org/wiki/GNU" class="extiw" title="w:GNU">GNU</a> project. The official text of version 1.1 of the license text can be found at: <a rel="nofollow" class="external free" href="http://www.gnu.org/copyleft/fdl.html">http://www.gnu.org/copyleft/fdl.html</a> </p><p>The license is designed for software documentation and other reference and instructional materials. It stipulates that any copy of the material, even if modified, carry the same license. Those copies may be sold but, if produced in quantity, have to be made available in a format which facilitates further editing. </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Secondary_Sections" data-mw-thread-id="h-Secondary_Sections"><span data-mw-comment-start="" id="h-Secondary_Sections"></span>Secondary Sections<span data-mw-comment-end="h-Secondary_Sections"></span></h2></div> <p>The license explicitly separates the "<a href="https://en.wikipedia.org/wiki/GNU_Free_Documentation_License/Document" class="extiw" title="w:GNU Free Documentation License/Document">Document</a>" from "<a href="https://en.wikipedia.org/wiki/GNU_Free_Documentation_License/Secondary_Sections" class="extiw" title="w:GNU Free Documentation License/Secondary Sections">Secondary Sections</a>", which may not be integrated with the Document, but exist as front-matter materials or appendices. Secondary sections can contain information regarding the author's or publisher's relationship to the subject matter, but not any subject matter itself. While the Document itself is wholly editable, and is essentially covered by a license equivalent to the <a href="https://en.wikipedia.org/wiki/GNU_General_Public_License" class="extiw" title="w:GNU General Public License">GNU General Public License</a>, some of the secondary sections have various restrictions designed primarily to deal with proper attribution to previous authors. </p><p>Specifically, the authors of prior versions have to be acknowledged and certain "invariant sections" specified by the original author and dealing with his or her relationship to the subject matter may not be changed. If the material is modified, its title has to be changed (unless the prior authors give permission to retain the title). The license also has provisions for the handling of <a href="https://en.wikipedia.org/wiki/GNU_Free_Documentation_License/Cover_Texts" class="extiw" title="w:GNU Free Documentation License/Cover Texts">front-cover and back-cover texts</a> of books, as well as for "History", "Acknowledgements", "Dedications" and "Endorsements" sections. </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Using_the_GFDL" data-mw-thread-id="h-Using_the_GFDL"><span data-mw-comment-start="" id="h-Using_the_GFDL"></span>Using the GFDL<span data-mw-comment-end="h-Using_the_GFDL"></span></h2></div> <p>For a document to be covered by the GFDL, one must include a specific copyright and license notice. </p> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Wiktionary_and_GFDL" data-mw-thread-id="h-Wiktionary_and_GFDL"><span data-mw-comment-start="" id="h-Wiktionary_and_GFDL"></span>Wiktionary and GFDL<span data-mw-comment-end="h-Wiktionary_and_GFDL"></span></h2></div> <p>All Wiktionary articles are licensed to the public under the GNU Free Documentation License. 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cdx-button--icon-only" id="ca-history-sticky-header" tabindex="-1" data-event-name="history-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-history mw-ui-icon-wikimedia-wikimedia-history"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only mw-watchlink" id="ca-watchstar-sticky-header" tabindex="-1" data-event-name="watch-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-star mw-ui-icon-wikimedia-wikimedia-star"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only" id="ca-edit-sticky-header" tabindex="-1" data-event-name="wikitext-edit-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-wikiText mw-ui-icon-wikimedia-wikimedia-wikiText"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only" id="ca-ve-edit-sticky-header" tabindex="-1" data-event-name="ve-edit-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-edit mw-ui-icon-wikimedia-wikimedia-edit"></span> <span></span> </a> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only" id="ca-viewsource-sticky-header" tabindex="-1" data-event-name="ve-edit-protected-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-editLock mw-ui-icon-wikimedia-wikimedia-editLock"></span> <span></span> </a> </div> <div class="vector-sticky-header-buttons"> <button class="cdx-button cdx-button--weight-quiet mw-interlanguage-selector" id="p-lang-btn-sticky-header" tabindex="-1" data-event-name="ui.dropdown-p-lang-btn-sticky-header"><span class="vector-icon mw-ui-icon-wikimedia-language mw-ui-icon-wikimedia-wikimedia-language"></span> <span>6 languages</span> </button> <a href="#" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive" id="ca-addsection-sticky-header" tabindex="-1" data-event-name="addsection-sticky-header"><span class="vector-icon mw-ui-icon-speechBubbleAdd-progressive mw-ui-icon-wikimedia-speechBubbleAdd-progressive"></span> <span>Add topic</span> </a> </div> <div class="vector-sticky-header-icon-end"> <div class="vector-user-links"> </div> </div> </div> </div> </div> <div class="vector-settings" id="p-dock-bottom"> <ul></ul> 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