The source code if x11iraf is mostly Open Source conform to the Open Source
Definition by the Open Source Initiative, https://opensource.org/osd

This file lists copyright holders and licenses for this source code.  Due to
the age of the software, it is almost impossible to assign specific licenses
to individual files. Most of the files were edited several times by different
copyright holders, and the changes may have a different license. All licenses
are permissible licenses.

Files that are not Open Source are specified with their copyright holders and
licenses in a separate file. LICENSES-nonfeee. These files may be removed from
the distribution with minimal functional loss.


Copyright holders
=================

1986-2014 Association of Universities for Research in Astronomy Inc.
1984-1988 Digital Equipment Corporation, Maynard, Massachusetts
1984-1991 Massachusetts Institute of Technology
1987-1989 The X Consortium
1987 Christopher A. Kent (DEC)
1989 Prentice Hall
1990 David Koblas
1989-1991 Jef Poskanzer
1995 Robert W. McMullen
2020 Ole Streicher <olebole@debian.org>


IRAF license
============

The IRAF software is publicly available, but is NOT in the public domain.
The difference is that copyrights granting rights for unrestricted use and
redistribution have been placed on all of the software to identify its authors.
You are allowed and encouraged to take this software and use it as you wish,
subject to the restrictions outlined below.

Permission to use, copy, modify, and distribute this software and its
documentation is hereby granted without fee, 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 references to
the Association of Universities for Research in Astronomy Inc. (AURA),
the National Optical Astronomy Observatories (NOAO), or the Image Reduction
and Analysis Facility (IRAF) not be used in advertising or publicity
pertaining to distribution of the software without specific, written prior
permission from NOAO.  NOAO makes no representations about the suitability
of this software for any purpose.  It is provided "as is" without express or
implied warranty.

NOAO DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL NOAO
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.


EXPAT/MIT license
=================

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name(s) of the above copyright
holders shall not be used in advertising or otherwise to promote the
sale, use or other dealings in this Software without prior written
authorization.


DEC license
===========

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 name of Digital Equipment
Corporation 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.


Old MIT license
===============

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, 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 name of M.I.T. not be used in advertising or
publicity pertaining to distribution of the software without specific,
written prior permission.  M.I.T. makes no representations about the
suitability of this software for any purpose.  It is provided "as is"
without express or implied warranty.


Other, BSD-alike license
========================

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.  This software is provided "as is" without express or
implied warranty.
