OSI-approved license that assigns contributor copyright to me

[David Barrett]

Matthew Garrett wrote:
> To the best of my knowledge, no. I'm not sure whether it's something you 
> /can/ do in a software license without extra paperwork being involved.

Can you give a bit more detail on why you believe this to be the case? 
Why can't an open-source license transfer copyright ownership? 
Specifically, what kind of paperwork do you have in mind?

-david