The PLplot package may be distributed under the following terms:

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free Software 
    Foundation, Inc. 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

The text of this license is given in the file COPYING.LIB in the
distribution directory.  Exceptions are noted below.

The intent behind distributing PLplot under the LGPL is to ensure that it
continues to evolve in a positive way, while remaining freely
distributable.  The package is considered a "library" even though there
are associated programs, such as plrender, pltek, plserver, and pltcl.
The ties between these programs and the library are so great that I
consider them as part of the library, so distribution under the terms of
the LGPL makes sense.  Software developers are allowed and encouraged to
use PLplot as an integral part of their product, even a commercial
product.  Under the conditions of the LGPL, however, the PLplot source
code must remain freely available, including any modifications you make to
it (if you distribute a program based on the modified library).  Please
read the full license for more info.


Additional Copyrights
---------------------

The octave front end which links to the PLplot library (but not vice versa),
and which is otherwise independent of PLplot is copyright under the GPL
license (see COPYING).

The startup code used in argument handling (utils/plrender.c and
src/plargs.c) is partially derived from "xterm.c" of the X11R5
distribution, and its copyright is reproduced here:

******************************************************************************
Copyright 1987, 1988 by Digital Equipment Corporation, Maynard, Massachusetts,
and the Massachusetts Institute of Technology, Cambridge, Massachusetts.

                        All Rights Reserved

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose and without fee is hereby granted, 
provided that the above copyright notice appear in all copies and that
both that copyright notice and this permission notice appear in 
supporting documentation, and that the names of Digital or MIT not be
used in advertising or publicity pertaining to distribution of the
software without specific, written prior permission.  

DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.
******************************************************************************

The documentation files are distributed under the following license terms:

               DocBook documentation for the PLplot Library

Copyright (C) 1994  Geoffrey Furnish and Maurice LeBrun
Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004  Alan W. Irwin
Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004  Rafael Laboissiere
Copyright (C) 2003  Joao Cardoso

License terms:

  ===========================================================================

    Redistribution and use in source (XML DocBook) and "compiled" forms
    (HTML, PDF, PostScript, DVI, TeXinfo and so forth) with or without
    modification, are permitted provided that the following conditions are
    met:

       1. Redistributions of source code (XML DocBook) must retain the
          above copyright notice, this list of conditions and the following
          disclaimer as the first lines of this file unmodified.

       2. Redistributions in compiled form (transformed to other DTDs,
          converted to HTML, PDF, PostScript, and other formats) must
          reproduce the above copyright notice, this list of conditions and
          the following disclaimer in the documentation and/or other
          materials provided with the distribution.

    Important: THIS DOCUMENTATION IS PROVIDED BY THE PLPLOT PROJECT "AS IS"
    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
    THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
    PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE PLPLOT PROJECT BE LIABLE
    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
    BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
    WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
    OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS DOCUMENTATION,
    EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

  ===========================================================================


Any file that is explicitly marked as "public domain" is free from any
restriction on distribution.  

Any file that has a explicit copyright notice may be distributed under
the terms of both the LGPL and whatever stated conditions accompany the
copyright.