IANAL but if you are the solely copyright holder (e.g. not your institution ;-) ) you can just give ownership to your code to anyone, but usually it seems to require a document stating it in writing: e.g. look how contributors agreements are done etc. quick google led me to
http://producingoss.com/en/copyright-ass...  which seems to be a sensible description.

why do you care though?  do they want you to transfer the rights to them?  even if you own the copyright, they have control of the code (besides re-licensing it under an incompatible license)