The original MP3.com (based in San Diego, CA) allowed artists on the site to create CDs from material they had uploaded to the site. These were then available for purchase via the site as D.A.M. (Digital Automatic Music) CD-Rs and included printed labels and art. If they chose to, artists could limit the time a D.A.M. CD-R was available. Once the site was shut down and sold in December 2003, all releases became unavailable.
All D.A.M. CD-Rs had catalogue numbers, usually on both the disc and the tray card. Look for two numbers separated by a dash; the first (and longer) number is the order id, and the second is the MP3.com catalogue number.