Copyright for unix.7:

This man page is Copyright (C) 1999 Andi Kleen <ak@muc.de>,
Copyright (C) 2008-2014, Michael Kerrisk <mtk.manpages@gmail.com>,
and Copyright (C) 2016, Heinrich Schuchardt <xypron.glpk@gmx.de>

License for unix.7:

Permission is granted to distribute possibly modified copies
of this page provided the header is included verbatim,
and in case of nontrivial modification author and date
of the modification is added to the header.