RE: [Zope-dev] License issues

The FSF page says this in regards to the ZPL: [snip]

We urge you not to use the license of Zope for software you write. However, there is no reason to avoid running programs that have been released under this license, such as Zope.

So what is the issue you are raising? Any software you write on or for Zope can be licensed in any manner you choose. Stallman et al may not "approve" of the ZPL mostly I think because it has more in common with the BSD license than the GPL, in that binary distribution of Zope is allowed without the source code.