IANAL but I think the moment you put a license on it you claimed copyright. IIRC you don't have rights to license someone else's creation without consent
That's the thing. You don't 'claim' copyright. It is a right established by the Berne Convention. You would file a claim if your copyright were violated, but other than that, you control distribution of your original work as long as Sonny Bono says. :-)
Points for coining a new abbrev. YDNR is going into my "snarky, not explained" responses in emails. :-) "What does that mean?" "Oh, I often hit some keys for a macro on my home computer that don't expand on this machine."