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<h1>License and Copyright</h1>

<blockquote>
<i>Omnis enim res, quae dando non deficit, dum habetur 
et non datur, nondum habetur, quomodo habenda est.</i>
<p>"For if a thing is not diminished by being shared with others, it is not
rightly owned if it is only owned and not shared."
<br>(Saint Augustine,
<a href="http://www.ccel.org/a/augustine/doctrine/doctrine.html"><i>De
Doctrina Christiana</i></a>, <i>c.</i> 396 AD.)
</blockquote>

<p>MIT Photonic-Bands is copyright &copy; 1999-2014 Massachusetts
Institute of Technology.

<p>MIT Photonic-Bands is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

<p>This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

<p>You should have received a copy of the GNU General Public License
along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.  You can also find it on the GNU web site:

<p align=center><a href="http://www.gnu.org/copyleft/gpl.html"><code>http://www.gnu.org/copyleft/gpl.html</code></a>

<p>The file "<code>minpack2-linmin.c</code>" was derived from the <a
href="ftp://info.mcs.anl.gov/pub/MINPACK-2/">MINPACK-2</a> package.
It is copyright &copy; 1996 by <a
href="http://www-unix.mcs.anl.gov/~more/">Jorge J. Mor&eacute;</a>,
who has graciously granted us permission to distribute it along with
MPB under the GNU General Public License.

<p>As a clarification, we should note that Scheme control
(<code>ctl</code>) files, written by the user (i.e. not containing
code distributed with MIT Photonic-Bands) and loaded at runtime by the
MIT Photonic-Bands software, are <em>not</em> considered derived works
of MIT Photonic-Bands and do <em>not</em> fall thereby under the
restrictions of the GNU General Public License.

<p>In addition, all of the example Scheme code in this manual, as well
as the example ctl files in the <code>mpb-ctl/examples/</code>
directory, may be freely used, modified, and redistributed, without
any restrictions.  (The warranty disclaimer still applies, of course.)

<h2><a name="referencing">Referencing</a></h2>

<p>We kindly ask you to reference the MIT Photonic-Bands package and
its authors in any publication for which you used MPB.  (You are not
legally <em>required</em> to do so; it is up to your common sense to
decide whether you want to comply with this request or not.)  The
preferred citation is our paper on MPB and related topics:

<blockquote>
Steven G. Johnson and J. D. Joannopoulos, "<a href="http://www.opticsexpress.org/abstract.cfm?URI=OPEX-8-3-173">Block-iterative
frequency-domain methods for Maxwell's equations in a planewave
basis</a>," <i>Optics Express</i> <b>8</b>, no. 3, 173-190 (2001), <code>http://www.opticsexpress.org/abstract.cfm?URI=OPEX-8-3-173</code>
</blockquote>

<p>Or, in <a href="http://www.ecst.csuchico.edu/~jacobsd/bib/formats/bibtex.html">BibTeX</a> format:

<pre>
@Article{Johnson2001:mpb,
  author =       {Johnson, Steven~G. and Joannopoulos, J.~D.},
  title =        {Block-iterative frequency-domain methods for Maxwell's equations in a planewave basis},
  journal =      {Opt. Express},
  year =         2001,
  volume =       8,
  number =       3,
  pages =        {173--190},
  url =  {http://www.opticsexpress.org/abstract.cfm?URI=OPEX-8-3-173}
}
</pre>

<p>If you want a one-sentence description of the algorithm
for inclusion in a publication, we recommend:

<blockquote>
Fully-vectorial eigenmodes of Maxwell's equations with periodic
boundary conditions were computed by preconditioned conjugate-gradient
minimization of the block Rayleigh quotient in a planewave basis,
using a freely available software package [<i>ref</i>].
</blockquote>

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