I purchased the movie “The Secret of Kells” from the Apple TV store in March. Rather than manually searching for movies in my library, I usually search for them or use Siri. Instead of a play button, it’s now giving me the option to purchase it. When I manually navigate to it in my library, I can play it. My assumption was that whenever Apple updated a movie (adding HD, for example), it wouldn’t have to be re-purchased. Any idea what might be going on here?