very detailed tests of DOC.loc discs can be found in the german brennmeister.com audio forum. http://www.brennmeister.com/forum/viewtopic.php?mode=viewtopic&topic=6615&forum=12&start=0
I’ve written a comprehension which is based upon those postings:
DOC.loc V1 and V2 even cannot be extracted with current Plextor drives including UltraPlex32 and UltraPlex40 (2nd revision with firmware 1.1x). Only the older Plex-CDROMs are able to ignore the protection. Most Teac drives (old SCSIs, IDEs and current recorders) can read those discs, too.
It is very important to switch off the auto-insert-notification. Otherwise Windows will crash in most cases.
A few weeks ago a new version of DOC.loc (V3) has been found on DE/VISION Remixes which is not as strong as V1 and V2. It can be ripped with current Plextors.
Discs with DOC.loc protection:
DOC.loc V1 & V2:
Deine Lakaien - Kasmodia (Startsektor 750 = 10-Sek.-PreGap)
Delerium - Odyssey (the remix collection), Label Nettwerk, DocDATA BNL, ID: 5415418 500740
Eins, Zwo - Zwei
Goethes Erben - Nichts bleibt wie es war (Startsektor 750 = 10-Sek.-PreGap)
Helium - Vola (Startsektor 750 = 10-Sek.-PreGap), Chrom Records
Peter Ratzenbeck - Peter’s Fancy (Startsektor 900 = 12-Sek.-PreGap)
Warp Brothers - Blast the Speakers (Startsektor 900 = 12-Sek.-PreGap), DOSorDIE Recordings GmbH, Zomba Vertrieb