Umm, that isn't neccessarily a good thing!
Basically, there are a couple of "illegal" ATIP codes that anyone can use if they feel like it. DST, MBIL and a number of smaller manufacturers have been known to use these ATIPs, but it's impossible to differentiate between manufacturers without more info about the disc. In come cases you can tell who made it by looking at the serial number(s), but even this isn't always accurate.
Punch Cards -> Paper Tape -> Tape Drive -> 8" Floppy Diskette -> 5 1/4" Floppy Diskette -> 3 1/2" "Flippy" Diskette -> CD-R -> DVD±R -> BD-R
The Progression of Computer Media