You can't really just 'slap a new license on it' AFAIUI. What you can do is fork and license any new derivative work under a new license (which is one-way compa

You can't really just 'slap a new license on it' AFAIUI. What you can do is fork and license any new derivative work under a new license (which is one-way compatible with the old one). Effectively that means that the fork can only be used under the new license.