[LAU] Mastering the meaning of mastering and "original master recording" in the digital age

Folks, I've got music ripped to my hard drive (hybrid wavpack for the curious), and i'm a little obsessive about my tagging. I've got a 'mastering' tag wherein i put the name of the mastering engineer and whether or not the track is an "original master recording". These original master recordings are usually DCC, Mobile Fidelity Sound Labs or Audio Fidelity labels. So now i'm staring at the rest of my collection wondering what to put in there. These original master recording discs are older (20+ years) when mastering was analog. My questions are: Most recent CDs were mastered digitally, therefore is the original master equivalent (at least in quality) to the CD i own? At about what year did most CDs become digitally mastered, rendering original master recordings moot, if they are? I *swear* i remember buying CDs when they came out and they used to tell you how things were mastered. Didn't they used to indicate AAD, ADD, DDD for (recording, editing, mastering)? Why did they stop doing this? Is there any way to tell/reasonably guess if a CD has been digitally mastered without those codes? Thanks, -- Bearcat M. Şándor Feline Soul Systems Voice: 872.CAT.SOUL (872.228.7685) Fax: 406.235.7070 Jabber/xmpp/gtalk/email: bearcat(a)feline-soul.net MSN: bearcatsandor(a)hotmail.com Yahoo: bearcatsandor AIM: bearcatmsandor My public pgp key is included for verification of my identity