Zope License | Python License | Zope Credits

## Zope Public License (ZPL) Version 1.0

### Copyright © 1997, 1998, 1999 Digital Creations, All rights reserved.

This license has been certified as Open Source(tm).

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 above copyright notice, this list of conditions, and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions, and the following disclaimer in the documentation and/or other materials provided with the distribution.
3. Digital Creations requests that attribution be given to Zope in any manner possible. Zope includes a "Powered by Zope" button that is installed by default. While it is not a license violation to remove this button, it is requested that the attribution remain. A significant investment has been put into Zope, and this effort will continue if the Zope community continues to grow. This is one way to assure that growth.
4. All advertising materials and documentation mentioning features derived from or use of this software must display the following acknowledgement:
     "This product includes software developed by Digital Creations for use in the Z Object Publishing Environment (http://www.zope.org/)."
   In the event that the product being advertised includes an intact Zope distribution (with copyright and license included) then this clause is waived.
5. Names associated with Zope or Digital Creations must not be used to endorse or promote products derived from this software without prior written permission from Digital Creations.
6. Modified redistributions of any form whatsoever must retain the following acknowledgment:
     "This product includes software developed by Digital Creations for use in the Z Object Publishing Environment (http://www.zope.org/)." Intact (re-)distributions of any official Zope release do not require an external acknowledgement.
7. Modifications are encouraged but must be packaged separately as patches to official Zope releases. Distributions that do not clearly separate the patches from the original work must be clearly labeled as unofficial distributions. Modifications which do not carry the name Zope may be packaged in any form, as long as they conform to all of the clauses above.

Disclaimer
  THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS ``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 DIGITAL CREATIONS OR ITS CONTRIBUTORS 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.

  ### This software is powered by Python!

  Copyright © 1991-1995 by Stichting Mathematisch Centrum, Amsterdam, The Netherlands.

  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 Stichting Mathematisch Centrum or CWI or Corporation for National Research Initiatives or CNRI not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission.

  While CWI is the initial source for this software, a modified version is made available by the Corporation for National Research Initiatives (CNRI) at the Internet address ftp://ftp.python.org.

  STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

  Zope uses the xmlrpclib module:

  Copyright © 1999 by Secret Labs AB
  Copyright © 1999 by Fredrik Lundh

  By obtaining, using, and/or copying this software and/or its associated documentation, you agree that you have read, understood, and will comply with the following terms and conditions:

  Permission to use, copy, modify, and distribute this software and its associated documentation for any purpose and without fee is hereby granted, provided that the above copyright notice appears in all copies, and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of Secret Labs AB or the author not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission.

  SECRET LABS AB AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL SECRET LABS AB OR THE AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

  Zope uses the C expat library by James Clark, for parsing XML text.

  Copyright (c) 1998, 1999 James Clark. Expat is subject to the Mozilla Public License Version 1.1.

  ### Zope Credits

  The Zope software receives contributions from far and wide. Here's the Zope Hall of Fame:

  - Jeff Bauer is Zope Dude Number One. Jeff took over PCGI and kept pushing it forward through the years.
  - Sam Rushing worked with us at Digital Creations to make Medusa the publishing platform for ZServer and the concurrency of Zope2.
  - A subset of windows guru Mark Hammond's win32 extensions are bundled with win32 binary distributions of Zope.
  - Martijn Pieters and Brian Hooper contributed the DTML 'in' tag reverse attribute.
  - Phillip Eby contributed the DTML `let` tag and many other useful ideas, including the inspiration for the DTML `call`, `with` and `return` tags.
  - The DateTime module was based on work from Ted Horst.
  - Jordan Baker contributed the 'try' tag, something I've wanted for a long, long time.
  - Martijn Pieters chipped in with a safe range function.
  - Michael Hauser came up with the name "Zope".
  - Eric Kidd added support for XML-RPC
  - Andrew M. Kuchling wrote the initial version of mod_pcgi, making him extremely cool in our book.
  - Jephte CLAIN made some patches to European TimeZope.
  - All the other Zopistas far and wide that stuck with us during the Bobo/Principia days and politely push us to make the best damn app server on this or any other planet.
  - Of course the list of credits would be quite incomplete without mentioning Guido van Rossum, benevolent dictator of Python and long-time friend of Digital Creations. Zope Power is Python Power.

  Paul Everitt, paul@digicool.com.