Generic filters for git archive?

I'm trying to add copyright headers to my source files as they are exported via git archive. eg:

* $Copyright$

to

 * Copyright (c) 2003-2009 by Foo Bar
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

And properly handling things like '# $Copyright$', '// $Copyright$', etc. I have a sed script that does this, but no way to apply it to the output of git archive. I tried setting up a smudge filter that would only smudge output on archive exports, but it doesn't appear that the smudge filters get run on git archive.

I am currently running 1.6.3.3