Here is a modified version of BackupHDDVD that will compute it's own hash, thanks to OverlordQ, and then retrieve a key from the online database at
http://www.hdkeys.com/
It also writes the key to keydb.cfg for later use.
http://www.hdkeys.com/files/BackupHDVD_HDKeys.com.rar
The syntax it uses to retrieve the keys is as follows:
http://www.hdkeys.com/getkey/hddvd/hash
It then reports:
Title|VolumeKey
Have fun!