How to Play Blu-Ray Discs on Your Computer (Lifehacker)
Sony's licensing on Blu-ray is obnoxious, and it means it's pretty difficult to play Blu-rays on your computer—in fact, Windows is the only operating system that can play them back natively. However, there are a few workarounds. Here are the best ways we've found for easily playing Blu-ray on a PC. Note that Windows users can use all three methods, while Mac or Linux users will need to go with the more complicated methods two or three.
Link: How to Play Blu-Ray Discs on Your Computer