Conversation so far:
what was matt hardy's broken gimmick legal battle about?
while The Hardys were in TNA, they had full creative control over the Broken gimmick.
what happened legally?
legal battle officially concluded when Matt legally acquired ownership of all trademarks.

Question: who did he acquire them from?
Self-contained rewrite: Who did Matt Hardy acquire ownership of the Broken gimmick trademarks from?