In order to contribute code to the project, you must sign and submit the Sun Microsystems Inc. Contributor Agreement (SCA). This agreement jointly assigns copyright over your work to yourself and to Sun Microsystems. Details are available on the "Contributing" page, and you can find a pdf of the SCA there. If you have questions on how it works, the FAQ: Licensing section should answer them. The page also has guidelines on the use of the licenses. If these don't help, send a note to the Community Manager.
