Funny thing about licensing; one of the other seminars I attended at Gen Con was the Candlekeep meet-up, which had panelists such as Ed Greenwood and James Lowder present. When things turned to Q&A, one of the questions put forward was (paraphrasing here), "Why did WotC do so little to support the D&D movie? They didn't put out an introductory boxed set like for Rick and Morty or Stranger Things, they didn't release a tie-in adventure; it was just some character sheets on D&D Beyond. What was up with that?"
After the obligatory reminder that no one on the panel actually worked for WotC (anymore), James Lowder volunteered the idea that WotC might have been contractually obligated to leave a lot of that stuff to Paramount (or other related companies, possibly in license with Paramount). As an example, he pointed to the tie-in prequel novels not being copyright to WotC, but Randomhouse. It was interesting to consider, if for no other reason than it struck me as being highly counterintuitive to what I'd expected.