Playing Blu-Ray discs in windows 10 is a bit og a pain. In order to get it to work you have to go through a few hoops with VLC.
Part A: Keys database
Create the folder “C:\ProgramData\aacs\”
Download keys.cfg from the link and place in the folder you created “C:\ProgramData\aacs\”
finding keysdb.cfg file isnt available at that site for some reason anymore.
Part B: AACS dynamic library
Depending on the version of VLC you have you just need to copy this dll file into the same directory.