swi-prolog-nox 6.6.4-2ubuntu1 / usr / lib / swi-prolog / doc / Manual / license.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

<html>
<head>
<title>SWI-Prolog 7.1.10 Reference Manual</title><link rel="home" href="index.html">
<link rel="contents" href="Contents.html">
<link rel="index" href="DocIndex.html">
<link rel="summary" href="summary.html">
<link rel="previous" href="glossary.html">
<link rel="next" href="clicense.html">

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<a class="nav" href="Contents.html"><img src="index.gif" alt="Contents"></a>
<a class="nav" href="DocIndex.html"><img src="yellow_pages.gif" alt="Index"></a>
<a class="nav" href="summary.html"><img src="info.gif" alt="Summary"></a>
<a class="nav" href="glossary.html"><img src="prev.gif" alt="Previous"></a>
<a class="nav" href="clicense.html"><img src="next.gif" alt="Next"></a>
</div>
<h1 id="sec:license"><a id="sec:E"><span class="sec-nr">E</span> <span class="sec-title">SWI-Prolog 
License Conditions and Tools</span></a></h1>

<a id="sec:license"></a>

<p>SWI-Prolog licensing aims at a large audience, combining ideas from 
the
<a class="url" href="http://www.fsf.org">Free Software Foundation</a> 
and the less principal <a class="url" href="http://www.opensource.org">Open 
Source Initiative</a>. The license aims at the following:

<p>
<ul class="latex">
<li>Make SWI-Prolog and its libraries `as free as possible'.

<p>
<li>Allow for easy integration of contributions. See <a class="sec" href="contrib.html">section 
E.2</a>.

<p>
<li>Free software can build on SWI-Prolog without limitations.

<p>
<li>Non-free (open or proprietary) software can be produced using 
SWI-Prolog, although contributed pure
<a class="url" href="http://www.gnu.org/copyleft/gpl.html">GPL-ed</a> 
components cannot be used.
</ul>

<p>To achieve this, different parts of the system have different 
licenses. SWI-Prolog programs consist of a mixture of `native' code 
(source compiled to machine instructions) and `virtual machine' code 
(Prolog source compiled to SWI-Prolog virtual machine instructions, 
covering both compiled SWI-Prolog libraries and your compiled 
application).

<p>For maximal coherence between free licenses, we start with the two 
prime licenses from the Free Software Foundation, the
<a class="url" href="http://www.gnu.org/copyleft/gpl.html">GNU General 
Public License</a> (GPL) and the
<a class="url" href="http://www.gnu.org/copyleft/lesser.html">Lesser GNU 
General Public License</a> (LGPL), after which we add a proven (used by 
the GNU C compiler runtime library as well as the GNU <em>ClassPath</em> 
project) exception to deal with the specific nature of compiled virtual 
machine code in a saved state.

<p>
<hr>
<div style="text-align:center">

<h2>Section Index</h2>

</div>
<hr>
<div class="toc">
<div class="toc-h2"><a class="sec" href="clicense.html"><span class="sec-nr">E.1</span> <span class="sec-title">The 
SWI-Prolog kernel and foreign libraries</span></a></div>
<div class="toc-h3"><a class="sec" href="clicense.html#sec:E.1.1"><span class="sec-nr">E.1.1</span> <span class="sec-title">The 
SWI-Prolog Prolog libraries</span></a></div>
<div class="toc-h2"><a class="sec" href="contrib.html"><span class="sec-nr">E.2</span> <span class="sec-title">Contributing 
to the SWI-Prolog project</span></a></div>
<div class="toc-h2"><a class="sec" href="softlicense.html"><span class="sec-nr">E.3</span> <span class="sec-title">Software 
support to keep track of license conditions</span></a></div>
<div class="toc-h2"><a class="sec" href="otherlicenses.html"><span class="sec-nr">E.4</span> <span class="sec-title">License 
conditions inherited from used code</span></a></div>
<div class="toc-h3"><a class="sec" href="otherlicenses.html#sec:E.4.1"><span class="sec-nr">E.4.1</span> <span class="sec-title">Cryptographic 
routines</span></a></div>
</div>
</body></html>

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