[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

      % mjablonski - Apr. 22, 2004 4:56 am:
       This would better be phrased "when you redistribute a GPL-licensed application, you must distribute it under
       the terms of the GPL, including licensing any modifications or extensions you make under the GPL. You must
       also provide the full source code, including source for your modifications."