The skinny on Apple’s DRM-free tracks

It’s been widely reported that the name and email address of the person who purchased the tracks is embedded in both DRM-protected and DRM-free iTunes Music Store tracks. The EFF has found evidence pointing to the fact that the files may contain a lot more identifying information as well. I’m not necessarily opposed to keeping identifying information about the purchaser in the tracks, but I am curious about what else Apple is stuffing into them.