In order to curtail HD content piracy, Corel has mandated an update to their WinDVD player to rectify the issue. This also means that you need to download an additional update for your device as well.
The move is in response to recent cracks in the AACC content protection system used to protect HD DVD and Blu-ray titles from non-permitted copying; attackers were apparently able to extract title and processing keys by analyzing memory utilization in WinDVD; with those keys, programmers were able to make copies of "protected" HD DVD and Blu-ray titles.