As things stand right now insofar as I can recollect, copyright is inalienable in the EU. That is, in contrast to the US, you can't give it away. But that's fine in practice, because you can still grant an exclusive royalty-free license. Is article 15 changing that?
I believe you can still transfer copyright to somebody else in the EU. Only certain "moral rights" are inalienable.
I don't know of any copyright law in any country that provides a way to "destroy" copyright before its term has elapsed. In the US, it seems to be held to be possible by legal tradition.