-Copyright (C)1996-9 Ian Jackson <ian@davenant.greenend.org.uk>.
-Copyright (C)1998 David Damerell <damerell@chiark.greenend.org.uk>
+Copyright 1996-2013,2016 Ian Jackson <ijackson@chiark.greenend.org.uk>
+Copyright 1998 David Damerell <damerell@chiark.greenend.org.uk>
+Copyright 1999,2003
+ Chancellor Masters and Scholars of the University of Cambridge
+Copyright 2010 Tony Finch <fanf@dotat.at>
+Copyright 2013,2016 Mark Wooding <mdw@distorted.org.uk>