[ZDP] BackTalk to Document The Zope Book (2.6 Edition)/Introducing Zope

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A comment to the paragraph below was recently added via http://zope.org/Documentation/Books/ZopeBook/2_6Edition/IntroducingZope.stx#2-43

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    The ZPL is different than another popular open source license, the
    "GNU Public License":http://www.gnu.org .  The licensing terms of
    the GPL require that if you intend to redistribute a GPL-licensed
    application, and you modify or extend the application in a
    meaningful way, that you contribute your modifications back to the
    licensor.  This is not required for ZPL-licensed applications,
    however.  You may modify and restribute Zope without contributing
    your modifications back to Zope Corporation as long as you follow
    the other terms of the license faithfully.

      % Anonymous User - Feb. 18, 2004 6:43 pm:
       Correction: the GPL does not require that you "contribute your modifications back to the licensor" - rather,
       it requires tht, if you distribute a work derived from a GPL-licensed work, you must distribute the derived
       source code along with it. For more information, see:
       http://www.gnu.org/licenses/gpl-faq.html#GPLRequireSourcePostedPublic