My understanding is that Cinavia DRM is only applied to 'Line out' audio used in TS recordings of movies you download online not BDrips or DVDrips.
in layman's terms.... its for movies that are recorded with a camera at a movie theater for the video and they use the 'line out' (headphone jack) for the audio so they don't record the people inside the theater. the audio has Cinavia DRM embedded so that when you try and play it on the PS3 or some BluRay players it doesn't play.
DVD/BDrips do not have Cinavia DRM to my knowledge
Yes it does some mkv that our out, like the new resident evil afterlife, and the losers , and the karate kid to name a few have this when u rip it it wil stop playing the audio when playing the muxed file of the movie on the ps3.
It was inplented in a fw for ps3, to hold back Bluray piracy, but only few titles have it.