Demo CD is an odd choice of words. I wonder if its an audio cd? Would be odd, especially with the rating on there, but I've seen worse.
Wel it doesn't give me a reason to think it is a music cd but who knows? It is sealed and I won't pop it open to find out.
These aren't too uncommon. Though, seeing specific old discs still wrapped in plastic is always a little curiosity. I think there actually was one in the pile of US demo discs you sent me, Dot50Cal. If not, I should at least have a copy of it somewhere, as I know I've had a few pass by my hands + seen a few up for grabs on ebay in the past. It has a proper console ID code (as expected) (SLUS-90087?) and a lot of US demo discs had "DEMO CD" written in the same font on the front (w/similar placement or similiarly aligned, but from top instead of bottom) Also, it's worth noting that the demo lists at Game Rave and PlayStation Museum are far from complete and can't really be used as a complete checklist of any sort. (But good for referance, though)