Copyright(c) 1999-2002 Josh Cogliati.
Permission is granted to anyone to make or distribute verbatim copies of this document as received, in any medium, provided that the copyright notice and permission notice are preserved, and that the distributor grants the recipient permission for further redistribution as permitted by this notice.
Permission is granted to distribute modified versions of this document, or of portions of it, under the above conditions, provided also that they carry prominent notices stating who last altered them.
All example python source code in this tutorial is granted to the public domain. Therefore you may modify it and relicense it under any license you please.