Unless specified otherwise in the "exceptions section" below:

Copyright (C) 1997-2003 Sistina Software, Inc.  All rights reserved.
Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.

Exceptions:

agents/hds_cb/*:
 Copyright (C) 2012 Matthew Clark.
 Author: Matthew Clark <mattjclark0407 at hotmail.com>
 
agents/xenapi/*:
 Copyright (C) 2011 Matthew Clark.
 Author: Matthew Clark <mattjclark0407 at hotmail.com>
 
agents/apc_snmp/powernet369.mib:
 Copyright (c) 2005 American Power Conversion, Inc.
 PowerNet is a Trademark of American Power Conversion Corp.

agents/eaton_snmp/fence_eaton_snmp.py:
 Copyright (c) 2011 eaton.com
 Author: Arnaud Quette <ArnaudQuette at Eaton.com>

agents/ifmib/fence_ifmib.py:
 Copyright (C) 2008-2011 Ross Vandegrift.
 Written by Ross Vandegrift <ross at kallisti.us>

agents/intelmodular/fence_intelmodular.pl:
 Contributed by Matthew Kent <matt at bravenet.com>

agents/ipmilan/expect.{c,h}:
 Copyright (C) 2000 Alan Robertson <alanr at unix.sh>

agents/node_assassin/*
 Copyright (C) 2009-2011 Madison Kelly/Alteeve's Niche!
 Author: Digimer <digimer at alteeve.com>

man/fence_ifmib.8:
 Copyright (C) 2008-2011 Ross Vandegrift.
 Written by Ross Vandegrift <ross at kallisti.us>

Authors as known by current RCS as of the time of writing:

Abhijith Das <adas at redhat.com>
Adam Manthei <amanthei at redhat.com>
A. J. Lewis <alewis at redhat.com>
Alasdair G. Kergon <agk at redhat.com>
Andrew Price <andy at andrewprice.me.uk>
Benjamin Marzinski <bmarzins at redhat.com>
Bob Peterson <rpeterso at redhat.com>
Chris Feist <cfeist at redhat.com>
Christine Caulfield <ccaulfie at redhat.com>
Daniel Phillips <phillips at redhat.com>
David Teigland <teigland at redhat.com>
Fabio M. Di Nitto <fdinitto at redhat.com>
James Parsons <jparsons at redhat.com>
Joel Becker <joel.becker at oracle.com>
Jonathan Brassow <jbrassow at redhat.com>
jparsons <jparsons at redhat.com>
Ken Preslan <kpreslan at redhat.com>
Klaus Wenninger <kwenning at redhat.com>
Lon Hohberger <lhh at redhat.com>
Marc - A. Dahlhaus <mad at wol.de>
Marek 'marx' Grac <mgrac at redhat.com>
Mark Hlawatschek <hlawatschek at atix.de>
Michael Conrad Tadpol Tilstra <mtilstra at redhat.com>
Patrick Caulfield <pcaulfie at redhat.com>
Robert Peterson <rpeterso at redhat.com>
Ross Vandegrift <ross at kallisti.us>
Ryan McCabe <rmccabe at redhat.com>
Ryan O'Hara <rohara at redhat.com>
Stanko Kupcevic <kupcevic at redhat.com>
Steven Whitehouse <swhiteho at redhat.com>
Wendy Cheng <wcheng at redhat.com>