I disagree. It depends how many bits you want to encode in what period of time. If you only need 1 bit per second, then it can still be inaudible and not suscep

I disagree. It depends how many bits you want to encode in what period of time. If you only need 1 bit per second, then it can still be inaudible and not susceptible to _current_ lossy psychoacoustic compression models. Universal was both dumb and greedy (and hopeful?) so they got caught making their music into crap. However, encoding a series of highly discernable tones into the audio is just dumb. Instead they should use phase modulation at low frequencies. Current compression models don't play with subtle changes of meter much, because they mostly use local encoding and there's not much room for improved compression with (non-audible) modulation. Of course, if Universal wanted to be able to accurately detect 5 second clips (rather than 2 minute songs) this would be a lot more difficult... and of course they want every thing, at the expense of listener experience.