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As explained in: http://www.gnu.org/prep/maintain/html_node/Copyright-Notices.html each individual file should have its own copyright notice. And it should explicitly list the years that the file was modified. The licence also helps. Based on hg, and the file COPYING, I came up with the following for the files I'm interested in: configure.ac:# Copyright (C) 2008, 2009, 2010, 2012, 2013 Red Hat, Inc. All rights reserved. src/filehmac.c: * Copyright (C) 2008, 2009, 2010, 2013 Red Hat Inc. All rights reserved. src/Makefile.am:# Copyright (C) 2008, 2009, 2010, 2013 Red Hat, Inc. All rights reserved.
I've added the missing notices to the upstream hg repository.