ZPL.txt

Zope Public License (ZPL) Version 2.1

A copyright notice accompanies this license document that
identifies the copyright holders.

This license has been certified as open source. It has also
been designated as GPL compatible by the Free Software
Foundation (FSF).

Redistribution and use in source and binary forms, with or
without modification, are permitted provided that the
following conditions are met:

1. Redistributions in source code must retain the
   accompanying copyright notice, this list of conditions,
   and the following disclaimer.

2. Redistributions in binary form must reproduce the accompanying
   copyright notice, this list of conditions, and the
   following disclaimer in the documentation and/or other
   materials provided with the distribution.

3. Names of the copyright holders must not be used to
   endorse or promote products derived from this software
   without prior written permission from the copyright
   holders.

4. The right to distribute this software or to use it for
   any purpose does not give you the right to use
   Servicemarks (sm) or Trademarks (tm) of the copyright
   holders. Use of them is covered by separate agreement
   with the copyright holders.

5. If any files are modified, you must cause the modified
   files to carry prominent notices stating that you changed
   the files and the date of any change.

Disclaimer

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS''
  AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
  NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  NO EVENT SHALL THE COPYRIGHT HOLDERS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  DAMAGE.