Copyright for proc.5:

Copyright (C) 1994, 1995 by Daniel Quinlan (quinlan@yggdrasil.com)
and Copyright (C) 2002-2008 Michael Kerrisk <mtk.manpages@gmail.com>
with networking additions from Alan Cox (A.Cox@swansea.ac.uk)
and scsi additions from Michael Neuffer (neuffer@mail.uni-mainz.de)
and sysctl additions from Andries Brouwer (aeb@cwi.nl)
and System V IPC (as well as various other) additions from
Michael Kerrisk <mtk.manpages@gmail.com>

License for proc.5:

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.

The GNU General Public License's references to "object code"
and "executables" are to be interpreted as the output of any
document formatting or typesetting system, including
intermediate and printed output.

This manual 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 General Public License for more details.

You should have received a copy of the GNU General Public
License along with this manual; if not, see
<http://www.gnu.org/licenses/>.