The FAQ <http://plone.org/foundation/copyrights/license-faq> is pretty good on these issues. To quote from it:
""" *Must add-on products for Plone be licensed under the GPL?* In most cases, yes. The GPL covers any "derivative works" of Plone, and defines these derivative works as those which: - copy or modify the code we provide to you (this includes Python code, HTML, images, etc.) - links to our GPL'd Python code (eg, by using Python's "import" statement) The vast majority of add-on products exhibit one or both of these behaviors, and, as such, must belicensed under the GPL. It is possible to create an add-on product that does not exhibit these behaviors (many generic Zope products that are not specific to Plone, and some Plone themes, do not). Such products need not belicensed under the GPL. """ An example of an add-on that might avoid the GPL requirement: a theme shipped as a Diazo theme. It doesn't need to import GPL code. On Fri, Jan 25, 2013 at 5:01 AM, Jean-Michel FRANCOIS <[email protected]>wrote: > Hi, > > I have a question regarding licensing of Plone addons. > > Context: The CMS Plone 4 is GPL v2 and is build upon Zope. > Zope is under ZPL license which is BSD-like > but it also adds clauses prohibiting trademark use and requiring > documentation of all changes. > Some core libraries of Plone are distributed under BSD license. > > I know I can't use GPLv3 for Plone addons (ie. Cyn.in can't be updated to > use Plone4) > > Now the questions: > > - Is there any default licensing for Plone addons? > - If I want to create a product a là Cyn.in do I need to publish this > project as GPLv2? > - What is the GPL version when I just write "GPL"? (This is the case > for many Plone addons.) > - Can a Plone addon be licensed under the BSD license? > > Regards / Cordialement, > JeanMichel FRANCOIS > Find me on Twitter <http://twitter.com/toutpt> / Retrouvez moi sur > Twitter<http://twitter.com/toutpt_nantes> > > > _______________________________________________ > Product-Developers mailing list > [email protected] > https://lists.plone.org/mailman/listinfo/plone-product-developers > >
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