Brunching Shuttlecocks does a swell job of covering the next generation of Digital Rights Management:
Starting in a very short while, all new music published by RIAA members will feature TuneBlock, a method whereby special harmonics included in the songs will erase all memory of the melody, chords, and words from your mind shortly after you hear it, leaving nothing but a pleasant sensation of having enjoyed something.
(Thanks, Geoff!)