/usr/lib/swi-prolog/doc/Manual/license.html

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<H1><A NAME="sec:E"><SPAN class="sec-nr">E</SPAN> <SPAN class="sec-title">SWI-Prolog 
License Conditions and Tools</SPAN></A></H1>

<A NAME="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:

<P>
<UL class="latex">
<LI>Make SWI-Prolog itself and its libraries are `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 consists 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>
<CENTER>

<H2>Section Index</H2>

</CENTER>
<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="sec-E.4.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="sec-E.4.html#sec:E.4.1"><SPAN class="sec-nr">E.4.1</SPAN> <SPAN class="sec-title">Cryptographic 
routines</SPAN></A></DIV>
</DIV>
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swi-prolog-nox 5.10.4-3ubuntu1 / usr / lib / swi-prolog / doc / Manual / license.html
