Mathematically is not to hard to understand, i deal with similar **** on university everyday, although this is harder, kakaroto's explanation is better than any of my teachers explanation, whats hard is the actual implementation of it...
Now that its explained, i hope you all understand that it is impossible to get the NPDRM keys.
Edit1
Although i have been thinking, about a possible timing attack, but i don't think its possible.
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<eussNL> judge: ´so why did you torrent 5 million AVI of women moaning´
<eussNL> <TizzyT> i dont judge if it sounds good i listen