Anyone got a link or explanation of this 'watermarking' thing that has been mentioned as a possible replacement for FairPlay? What is it and how might it work?
http://en.wikipedia.org/wiki/Digital_watermarking
Essentially, with an audio file, there's some data encoded (in analogue form) in the frequencies that are beyond the human hearing range. When these files are then decoded, the data reveals who bought the track, where it was bought etc.
Basically, if you buy a song and it ends up being sent round the world to millions of people, you're going to be screwed.