The schtonk program and associated documentation may be used and copied
as stated in GNU Affero General Public Licence that you should have
received with the rest of this stuff. If you did not, you can find
the licence here: http://www.gnu.org/licenses/agpl.txt.
Schtonk is copyright (C) Antti Järvinen 2007-2008.
Schtonk is available from here: http://muikku.katiska.org/schtonk/schtonk.html
There is an exeption: the diff routines are stolen from tcllib, with modifications. Tcllib, to authors understanding, has BSD license. The diff routines are separated into separate file, named diff.tcl, still having BSD license.