LICENSE.txt

Zope Public License 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.

5. If You make a patent infringement claim against any entity
   (including a cross- claim or counterclaim in a lawsuit) alleging that
   the software licensed hereunder constitutes direct or contributory
   patent infringement, then any patent and any right-to-use licenses
   granted to You under this License for that software shall terminate as
   of the date such claim is made.

If any files are modified by You then 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.