Leo is Open Software and is distributed under the terms of the Python License.
The gist of the license is that Leo is absolutely free, even for commercial use
(including resale). There is no GNU-like "copyleft" restriction. The Open Source
Initiative board has voted to certify the Python license as Open Source. This
license is compatible with the GPL.

Copyright (c) 1997-2008 by Edward K. Ream. All Rights Reserved.

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted, provided that
the above copyright notice appear in all copies and that both that copyright
notice and this permission notice appear in supporting documentation, and that
the names of Leo or Edward K. Ream not be used in advertising or publicity
pertaining to distribution of the software without specific, written prior
permission.

DISCLAIMER OF WARRANTIES

EDWARD K. REAM (REAM) SPECIFICALLY DISCLAIMS ALL WARRANTIES, EXPRESSED OR
IMPLIED, WITH RESPECT TO THIS COMPUTER SOFTWARE, INCLUDING BUT NOT LIMITED TO
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN
NO EVENT SHALL REAM BE LIABLE FOR ANY LOSS OF PROFIT OR ANY COMMERCIAL DAMAGE,
INCLUDING BUT NOT LIMITED TO SPECIAL, INCIDENTAL, CONSEQUENTIAL OR OTHER
DAMAGES.