Q: Titanic Digital Copy Issues

I've recently purchased the Titanic Blu-ray 3D DVD and wanted to download the digital copy. I followed the instructions to the letter. After the movie was downloaded, I attempted to play it. I got a message saying that this computer is not authorized to play Titanic and would I like to authorize it. I thought already this was an odd message already seeing as though this is the only computer I've downloaded the movie on. So I go ahead and authorize it. Then it says you cannot authorize more than 5 computers!! How the heck can that be?! This makes absolute no sense at all and I'm very angry that I am not able to enjoy my digital copy of the movie at all. How can this be rectified? I hope someone out there can help!

Thanks,

Lane