Amazon doesn't include the name of the buyer in the music file - either in the file's mp3 encoding itself or in the ID3 tag. Tagging the ID3 as you download the

Amazon doesn't include the name of the buyer in the music file - either in the file's mp3 encoding itself or in the ID3 tag. Tagging the ID3 as you download the file is technically possible, but changing the MP3 encoding on-the-fly as you buy/download the file isn't particularly feasible for several reasons. The most notable is that there would be a 'privacy' outcry from the dark corners of the web, the way they reacted when Apple seemed to do something like that with iTunes. If you have any suspicion about it, get a friend to buy a random MP3 from Amazon using her account and buy the same file yourself using your account. Compare the two MP3s using whatever tool you want; I did, and they seemed to be absolutely identical. FWIW, there is a field in the Amazon MP3 ID3 - under 'Comments' - which says Amazon.com Song ID: 20XXXXXXX (I Xed the last seven digits). That's a unique song identifier, not a user identifier.