How to Play DVDs and Blu-rays on Linux
 

Commercial DVDs and Blu-ray discs are encrypted. The Digital Rights Management (DRM) is designed to prevent you from ripping them, copying them, and watching them on unsupported players. You can get around this protection to watch DVDs and Blu-rays on Linux, but it’ll take some tweaking.

http://www.howtogeek.com/240487/how-...rays-on-linux/