Defining license for a NetBSD program

Hello to all,

I'd like to define a license for ftp/tnftp from NetBSD and not sure if
BSDnCLAUSE applies here.

Any help is welcome.

COPYRIGHT (from README):
---------
tnftp is covered by a BSD-style copyright notice.
Please refer to the file `COPYING' for more information.

COPYING:

Copyright (c) 2001-2023 The NetBSD Foundation, Inc.
All rights reserved.

This code is derived from software contributed to The NetBSD Foundation
by Simon Burge, Luke Mewburn, and Christos Zoulas.

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.

THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.


This product also contains software developed by other people, and you
are advised to read the various source files to read the full details
of the other licenses. Those licenses also require the following
acknowledgements:

        This product includes software developed by the NetBSD Foundation,
        Inc.  and its contributors. Those contributors include:
                - Simon Burge
                - Jaromir Dolecek
                - Klaus Klein
                - Luke Mewburn
                - Jason R. Thorpe of the Numerical Aerospace Simulation
                  Facility, NASA Ames Research Center.
                - Christos Zoulas

        This product includes software developed by the University of
        California, Berkeley and its contributors. Those contributors
include:
                - Christos Zoulas of Cornell University.
                - Guido van Rossum.

        This product includes software developed by Christos Zoulas.

-- 
Nuno Teixeira
FreeBSD Committer (ports)