Zeo Developer Terms of Use

[Chris Travers]

As an addition, if there are GPL'd dependencies you want to use, you'd
probably get further talking to those projects in terms of what they
expect than you will on this list.  Many different projects interpret
these licenses in subtly different ways (see the differences in how
Linus and RMS treat the GPL v2), and where there are concerns, talking
to the copyright holders can be quite helpful.  It can also ensure
fewer problems later.

Even the FSF has been known to grant additional copyright licenses to
things they own the copyrights to....

Best Wishes,
Chris Travers