From Techdirt

 

As was announced <http://www.techdirt.com/articles/20070402/081920.shtml>
last month, Apple finally has started selling some EMI tunes through iTunes
without DRM, but with an additional $0.30 in the price. Apparently there are
some glitches <http://www.pcworld.com/article/id,132392-pg,1/article.html> ,
but perhaps that's not too surprising. A more interesting point, however,
was submitted by John, who notes that while the DRM is gone, in its place is
metadata <http://www.tuaw.com/2007/05/30/tuaw-tip-dont-torrent-that-song/>
about who bought the song. In other words, should you take a non-DRM'd file
bought at iTunes and pass it on to someone else or put it on a file sharing
network, it would be possible for someone to track you down (though, there
would be no evidence that you purposely distributed the file). It's
basically a poor-man's DRM, like watermarking technology, that is designed
to scare you off from sharing the music. Not too surprising, really, but
continues to show how the industry is confused about the promotional value
of its own music.