Thanks, that's interesting to know. I used DVDFab to make a full disk copy and it indeed shows that it removed the region restriction and that there are no copy protections. But I have two DVD players -- one probably 9 years old and the other only about 3-4 years old. The DVD will not load in either.
On a possibly related note, I tried importing the DVDFab-copied disk into Corel's Pinnacle Studio v22 but it says that it found copy protected files -- didn't say which ones -- so it looks like DVDFab may not be finding and removing all of the protections from all of the files..
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Info from DVDFab...
Info for drive [F:\] (DVDFab 11.0.1.4)
Vendor: HL-DT-ST, Product: BD-RE WH14NS40
Revision: 1.02, Vendor specific: N000100SIK97G6TF374
Drive region: 1 (RPC II), changes left: 4(user) / 4(vendor)
AACS v1, AGIDs: 2, revocation level: Unknown
Support: BUS_ENCRYPTION=YES BN_GENERATION=YES
Disc media: DVD (DVD-Video)
Disc region: 1, 2, 3, 4, 5, 6, 7, 8
Volume name: THE_SOUND_OF_MUSIC_DISC_1
Video standard: PAL
Layer 0 size: 1902336 sectors (3715 MBytes)
Layer 1 size: 1902336 sectors (3715 MBytes)
CSS (Content Scramble System) protection not found.
RC (Region Code) protection not found.
RCE (Region Code Enhancement) protection not found.
APS (Analog Protection System) protection not found.
UOPs (User Operation Prohibitions) protection not found.
Invalid PTTs, PGCIs, PGCs, TMAPs, CELLs, VOBUs protection not found.
Fake vts protection not found.
Bad sector protection not found.
Structure protection (ARccOS, RipGuard, etc.) not found.
PathPlayer is enabled!
Unplayable cell not found.
full disc copy/play is supported