Five is distributed under the provisions of the Zope Public License (ZPL) v2.1. See doc/ZopePublicLicense.txt for the license text. Copyright (C) 2005 Five Contributors. See CREDITS.txt for a list of Five contributors. Five contains source code derived from: - Zope, copyright (C) 2001-2005 by Zope Corporation. - metaclass.py is derived from PEAK, copyright (C) 1996-2004 by Phillip J. Eby and Tyler C. Sarna. PEAK may be used under the same terms as Zope. - TrustedExecutables. Dieter Mauer kindly allow licensing this under the ZPL 2.1.