Python, licenses and CVS

[Hans Nowak]

Thanks to everyone who replied to my questions about licenses
and CVS. Things are clearer now. 

I have a follow-up question though. The project I'm currently working on
is well suited for third-party 
contributions; it makes sense for others to add modules if 
they want to. If my code is released under, say, the GPL, what
happens when someone else wants to contribute to it? Does the
new code have to be GPL too? Or GPL-compatible? 

TIA,

--Hans