> It's the guest additions ISO thingy that's not open source. No, it's the extension pack that is closed source and under a non-GPL license. The guest addition

> It's the guest additions ISO thingy that's not open source. No, it's the extension pack that is closed source and under a non-GPL license. The guest additions ISO is commonly confused with the extension pack, but they have completely different spheres of influence and functionality. Guest additions is GPLv2, just as the main app is. https://www.virtualbox.org/wiki/Licensing_FAQ https://www.virtualbox.org/wiki/Licensing_FAQ