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<title>1.6. LAMMPS open-source license — LAMMPS documentation</title>
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<div class="lammps_version">Version: <b>19 Nov 2024</b></div>
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<p class="caption" role="heading"><span class="caption-text">User Guide</span></p>
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<li class="toctree-l1 current"><a class="reference internal" href="Intro.html">1. Introduction</a><ul class="current">
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<li class="toctree-l2"><a class="reference internal" href="Intro_overview.html">1.1. Overview of LAMMPS</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Manual_version.html">1.2. What does a LAMMPS version mean</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Intro_features.html">1.3. LAMMPS features</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Intro_nonfeatures.html">1.4. LAMMPS non-features</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Intro_portability.html">1.5. LAMMPS portability and compatibility</a></li>
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<li class="toctree-l2 current"><a class="current reference internal" href="#">1.6. LAMMPS open-source license</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="#gpl-version-of-lammps">1.6.1. GPL version of LAMMPS</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#lgpl-version-of-lammps">1.6.2. LGPL version of LAMMPS</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Intro_authors.html">1.7. Authors of LAMMPS</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Intro_citing.html">1.8. Citing LAMMPS</a></li>
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<li class="toctree-l2"><a class="reference internal" href="Intro_website.html">1.9. Additional website links</a></li>
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</ul>
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<li class="toctree-l1"><a class="reference internal" href="Install.html">2. Install LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Build.html">3. Build LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Run_head.html">4. Run LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Commands.html">5. Commands</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Packages.html">6. Optional packages</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Speed.html">7. Accelerate performance</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Howto.html">8. Howto discussions</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Examples.html">9. Example scripts</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Tools.html">10. Auxiliary tools</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Errors.html">11. Errors</a></li>
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<p class="caption" role="heading"><span class="caption-text">Programmer Guide</span></p>
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<li class="toctree-l1"><a class="reference internal" href="Library.html">1. LAMMPS Library Interfaces</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Python_head.html">2. Use Python with LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Modify.html">3. Modifying & extending LAMMPS</a></li>
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<li class="toctree-l1"><a class="reference internal" href="Developer.html">4. Information for Developers</a></li>
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<p class="caption" role="heading"><span class="caption-text">Command Reference</span></p>
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<li class="toctree-l1"><a class="reference internal" href="commands_list.html">Commands</a></li>
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<li class="toctree-l1"><a class="reference internal" href="pairs.html">Pair Styles</a></li>
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<li class="toctree-l1"><a class="reference internal" href="angles.html">Angle Styles</a></li>
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<li class="toctree-l1"><a class="reference internal" href="dihedrals.html">Dihedral Styles</a></li>
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<p><span class="math notranslate nohighlight">\(\renewcommand{\AA}{\text{Å}}\)</span></p>
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<section id="lammps-open-source-license">
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<h1><span class="section-number">1.6. </span>LAMMPS open-source license<a class="headerlink" href="#lammps-open-source-license" title="Link to this heading"></a></h1>
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<section id="gpl-version-of-lammps">
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<h2><span class="section-number">1.6.1. </span>GPL version of LAMMPS<a class="headerlink" href="#gpl-version-of-lammps" title="Link to this heading"></a></h2>
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<p>LAMMPS is an open-source code, available free-of-charge, and distributed
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under the terms of the <a class="reference external" href="https://github.com/lammps/lammps/blob/develop/LICENSE">GNU Public License Version 2</a> (GPLv2),
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which means you can use or modify the code however you wish for your own
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purposes, but have to adhere to certain rules when redistributing it -
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specifically in binary form - or are distributing software derived
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from it or that includes parts of it.</p>
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<p>LAMMPS comes with no warranty of any kind.</p>
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<p>As each source file states in its header, it is a copyrighted code, and
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thus not in the public domain. For more information about open-source
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software and open-source distribution, see <a class="reference external" href="https://www.gnu.org">www.gnu.org</a>
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or <a class="reference external" href="https://www.opensource.org">www.opensource.org</a>. The legal text of the GPL as it
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applies to LAMMPS is in the LICENSE file included in the LAMMPS distribution.</p>
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<p>Here is a more specific summary of what the GPL means for LAMMPS users:</p>
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<p>(1) Anyone is free to use, copy, modify, or extend LAMMPS in any way they
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choose, including for commercial purposes.</p>
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<p>(2) If you <strong>distribute</strong> a modified version of LAMMPS, it must remain
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open-source, meaning you are required to distribute <strong>all</strong> of it under
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the terms of the GPLv2. You should <strong>clearly</strong> annotate such a modified
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code as a derivative version of LAMMPS. This is best done by changing
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the name (example: LIGGGHTS is such a modified and extended version of
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LAMMPS).</p>
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<p>(3) If you release any code that includes or uses LAMMPS source code,
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then it must also be open-sourced, meaning you distribute it under the
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terms of the GPLv2. You may write code that interfaces LAMMPS to a
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differently licensed library. In that case the code that provides the
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interface must be licensed GPLv2, but not necessarily that library
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unless you are distributing binaries that require the library to run.</p>
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<p>(4) If you give LAMMPS files to someone else, the GPLv2 LICENSE file and
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source file headers (including the copyright and GPLv2 notices) should
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remain part of the code.</p>
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</section>
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<section id="lgpl-version-of-lammps">
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<h2><span class="section-number">1.6.2. </span>LGPL version of LAMMPS<a class="headerlink" href="#lgpl-version-of-lammps" title="Link to this heading"></a></h2>
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<p>We occasionally make stable LAMMPS releases available under the <a class="reference external" href="https://www.gnu.org/licenses/old-licenses/lgpl-2.1.html">GNU
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Lesser Public License v2.1</a>. This is on request only and with
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non-LGPL compliant files removed. This allows uses linking non-GPL
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compatible software with the (otherwise unmodified) LAMMPS library
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or loading it dynamically at runtime. Any <strong>modifications</strong> to
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the LAMMPS code however, even with the LGPL licensed version, must still
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be made available under the same open source terms as LAMMPS itself.</p>
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