I predict Disney will lose.
Big textbook publishers have been trying to pull this crap for years and were finally trounced in the Supreme Court when it was ruled that once a textbook is sold to someone, you don't get to dictate whether and where it can be resold.
Disney is selling a code for a one time download. Once you purchase it, and you haven't used it yet, you should have the right to do whatever you want with it.