keyctl.2: Change license

Eugene Syromyatnikov and I are now the copyright holders,
and Eugene agreed with my suggestion to change the license.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man2/keyctl.2

@@ -3,11 +3,26 @@
 .\" A very few fragments remain from an earlier version of this page
 .\" written by David Howells (dhowells@redhat.com)
 .\"
-.\" %%%LICENSE_START(GPLv2+_SW_ONEPARA)
-.\" This program is free software; 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.
+.\" %%%LICENSE_START(VERBATIM)
+.\" Permission is granted to make and distribute verbatim copies of this
+.\" manual provided the copyright notice and this permission notice are
+.\" preserved on all copies.
+.\"
+.\" Permission is granted to copy and distribute modified versions of this
+.\" manual under the conditions for verbatim copying, provided that the
+.\" entire resulting derived work is distributed under the terms of a
+.\" permission notice identical to this one.
+.\"
+.\" Since the Linux kernel and libraries are constantly changing, this
+.\" manual page may be incorrect or out-of-date.  The author(s) assume no
+.\" responsibility for errors or omissions, or for damages resulting from
+.\" the use of the information contained herein.  The author(s) may not
+.\" have taken the same level of care in the production of this manual,
+.\" which is licensed free of charge, as they might when working
+.\" professionally.
+.\"
+.\" Formatted or processed versions of this manual, if unaccompanied by
+.\" the source, must acknowledge the copyright and authors of this work.
 .\" %%%LICENSE_END
 .\"
 .TH KEYCTL 2 2015-05-07 Linux "Linux Key Management Calls"