Copyright for charsets.7:

Copyright (c) 1996 Eric S. Raymond <esr@thyrsus.com>
and Copyright (c) Andries Brouwer <aeb@cwi.nl>

License for charsets.7:

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