Zope Public License (ZPL) Version 2.1
      

      Redistribution and use in source and binary forms, with or without modification, are permitted provided
         that the following conditions are met:
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          Redistributions in source code must retain the accompanying copyright notice, this list of
             conditions, and the following disclaimer.
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          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.
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          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.
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          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.
        
          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,
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         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.