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Allowing Oracle to incorporate your contributions Even though VirtualBox' source code is licensed to you under the GPL, it's not enough to submit your patches under the GPL. The Licensing FAQ will tell you more about how Oracle handles VirtualBox licensing.
In any event, if you like to contribute anything that is subject to copyright (text, media, or code), Oracle must be legally certain they can redistribute the code you have contributed to their own customers who have purchased closed-source editions of VirtualBox. In order to be able to accept your contribution, we must therefore ask you to do one of two things:
Fill out the Contributor's Agreement (CA) and send it to Oracle. With the CA, you give Oracle permission to use your contribution under licenses other than the main VirtualBox license. This is a once-in-a-lifetime event: once we have your CA, we will never again ask you to undergo any bureaucratic procedures, and all future contributions are covered. If you don't want to sign such an agreement, you can alternatively submit your contribution under the MIT license. This is a liberal, wide-spread Open Source license that allows Oracle (and anyone else) to use your contribution in both open-source and closed-source projects. Basically, the main difference between the two options is this: With the CA, a written statement is necessary, but then only Oracle is allowed to relicense your code (unless you give other people the same permission). With the MIT license, you save the paperwork, but everyone else can use your code as well. It's your choice.