I'm afraid that even though your project may well
be worth it you won't
attract (m)any developers on this list by stating something like "you'd
need to be happy about me taking over the copyright of any stuff you
send me".
with all due respect to Jan, I would point out that the Ardour project
requires this as well. this does not seem to have daunted anyone from
contributing. i do not claim copyright on pre-existing code that is
used in Ardour, which is why the startup message credits copyright for
portions of ardour to a few other people (steve harris in particular,
the person who wrote libxml++ and a guy who worked with me on the
undo/redo system in a generic way unrelated to ardour).
i do this because if i ever want to negotiate a non-GPL license
arrangement with ACompanyWhoWantsMeToRetireAnotherTime, then i need
control of all the copyrights. the fact that ardour is linked against
several GPL'ed libraries in non-trivial ways makes it hard to see how
any non-GPL'ed instance could ever exist, but hey, my wallet would be
happy :)
--p