Copyrights
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## Copyrights

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 Street, 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. Note in particular that either open-source or proprietary code can be linked to LGPLed code such as PLplot, see the interpretation here. Full details of the LGPL are given here.

### Additional Copyrights

The start up 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.
    	******************************************************************************

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.

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