Sadly, hackers and thieves don't even need keys anymore - LibreDrive took care of that. It amazes me the lengths people go to in order to bypass the content owner's rights. If this hack isn't from an Apple stream, I'd put my money on LibreDrive being this thief's method.
That MakeMkv update is not officially out yet. It's much more likely it's really a Web-DL right now.