Legally, you need something like CyberLink’s PowerDVD or ArcSoft’s TotalMedia Theatre to play the Bluray disk. They are licensed to decode and play pre-recorded Bluray content.
All your hardware, used to show the movie, in your chain also has to be licensed (disc drive, video card, monitor...).
There are probably other ways to get around it, but they are not legal and cannot be discussed here. Try Google.