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
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