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<td ><a href="index.html">Qt 5.9</a></td><td >Qt Licensing</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.9.4 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
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<li class="level1"><a href="#purchasing-and-sales-information">Purchasing and Sales Information</a></li>
<li class="level1"><a href="#licensed-code-in-qt">Licensed Code in Qt</a></li>
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<h1 class="title">Qt Licensing</h1>
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<p>Qt is available under different licensing options designed to accommodate the needs of our various users:</p>
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<li>Qt licensed under <i>commercial</i> licenses is appropriate for development of proprietary/commercial software where you do not want to share any source code with third parties or otherwise cannot comply with the terms of the GNU LGPL version 3.</li>
<li>Qt licensed under the <a href="lgpl.html">GNU Lesser General Public License (LGPL)</a> version 3 is appropriate for the development of Qt applications provided you can comply with the terms and conditions of the GNU LGPL version 3 (or GNU GPL version 3).</li>
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<p>Qt contains also <a href="licenses-used-in-qt.html">third-party code</a> that is licensed under specific open-source licenses from the original authors.</p>
<p><b>Note: </b>For open-source licensed Qt, some specific parts (modules) are not available under the GNU LGPL version 3, but under the <a href="gpl.html">GNU General Public License (GPL)</a> instead. See the list of <a href="qtmodules.html#gpl-licensed-addons">Qt modules</a> for details. For commercial licensees, all modules are available under a single, commercial Qt license.</p><p><i>Qt documentation</i> is licensed under the terms of the <a href="fdl.html">GNU Free Documentation License (FDL)</a> version 1.3, as published by the Free Software Foundation. Alternatively, you may use the documentation in accordance with the terms contained in a written agreement between you and The Qt Company.</p>
<p>See <a href="http://qt.io/licensing/">http://qt.io/licensing/</a> for an overview of Qt licensing.</p>
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<h2 id="purchasing-and-sales-information">Purchasing and Sales Information</h2>
<p>To purchase a Qt license, visit <a href="http://www.qt.io/download/">http://www.qt.io/download/</a>.</p>
<p>For further information and assistance about Qt licensing, contact our sales; see <a href="http://www.qt.io/locations/">http://www.qt.io/locations/</a> for contact details.</p>
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<h2 id="licensed-code-in-qt">Licensed Code in Qt</h2>
<p>The following page documents the open-source licenses used in different parts of Qt:</p>
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<li><a href="licenses-used-in-qt.html">Licenses Used in Qt</a></li>
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<acronym title="Copyright">©</acronym> 2017 The Qt Company Ltd.
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