The individual files in this distribution are copyright their
original contributors or assignees.
Including:

    Copyright (c) 1993-2021, Simon J Gerraty
    Copyright (c) 2020, Roland Illig <rillig@NetBSD.org>
    Copyright (c) 2009-2016, Juniper Networks, Inc.
    Copyright (c) 2009, John Birrell.
    Copyright (c) 1997-2021 The NetBSD Foundation, Inc.
    Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
    Copyright (c) 1989 by Berkeley Softworks
    Copyright (c) 1988, 1989, 1990, 1992, 1993
    	The Regents of the University of California.
    Copyright (c) 1988, 1989 by Adam de Boor

With the exception of the GNU configure script, which states:

    # Copyright (C) 1992-1996, 1998-2012 Free Software Foundation, Inc.
    #
    # This configure script is free software; the Free Software Foundation
    # gives unlimited permission to copy, distribute and modify it.

The license for this distribution is considered to be:

    SPDX-License-Identifier: BSD-3-Clause

example (from https://opensource.org/licenses/BSD-3-Clause):

    Copyright <YEAR> <COPYRIGHT HOLDER>
    
    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

    1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.

    2. Redistributions in binary form 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.

    3. Neither the name of the copyright holder nor the names of its
    contributors may be used to endorse or promote products derived
    from this software without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
    CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS
    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 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
    SUCH DAMAGE.