DRM-free?

These Apple people are such sneaky people... makes me not want to buy anything from them!!
Although they are making their music in iTunes store DRM-free, they insert your email info into each song/video you purchase so that they can trace songs. Seriously Apple people???
Some thoughts:
- can't you just take out the email via a text-editor?
- wouldn't there be privacy concerns here for the consumer?
- seems Amazon puts inserts a watermark as well, but not related to the purchaser - only that it was purchased from Amazon.

Update:
Amazon doesn't watermark the songs itself. The labels that provide the songs do themselves so the good news is that the songs are not individually marked; i.e., the same song bought from two different accounts is bit-wise identical.