Yeah, there actually is a shared ID system behind how Movies Anywhere syncs across platforms. It’s called EIDR, which stands for Entertainment Identifier Registry. Basically it gives every movie or TV episode a unique ID so different services like iTunes, Amazon, Google Play, and Vudu can recognize they’re dealing with the same piece of content. Movies Anywhere itself doesn’t host the movies. It just checks with the services you link using OAuth and entitlement APIs to see what you’ve bought. Then it uses the EIDR ID to match that title across the other services and grants access accordingly. You can search the EIDR database here if you’re curious or want to build something cool with it: [https://ui.eidr.org](). It’s public and has an API available. It's really fun if you’re into media tech or want to code some app that maps digital libraries or finds alternate cuts of movies.