There's lots of avanced talk on here, I have no idea what your all talking about (I've done some C++ in college and thats about it....
)
But isn't this the point.
You got some sets of keys already, right?
So if a software player is upgraded, the new release of the player will use some advanced techniques to hide the keys, and it can be certain it will act the same for all discs (Use the same advanced technique always).
But you've already got the keys for some discs, so just search for the current keys you know when playing a disc thats already known in the new player, I'm sure Muslix64 etc, will be able to find out how the algorithm works by doing a search for the known key?
Therefore no matter what player is released with whatever advanced key hiding rubbish you will always be able to find out the algorithm\process being used with your known key.
And apply it to new titles, that won't play in the old player.
BD+ is said to be impossible to implement in the real world....
So its over, right?