www.makemkv.com

FYI
I realize this is a recent release. ( NOV 16, 2020 )
error w/ Dawn of the Dead: Limited Edition (4K UHD) [Blu-ray]

The volume key is unknown for this disc - video can't be decrypted
Failed to open disc

see attached error dumps
Thanks!!

UHD FAQ

Refer to section Hashed Keys > MakeMKV says that "the volume key is unknown for this disc"?

Basically, email EACH .tgz to svq@makemkv.com & the key(s) will automatically be downloaded when available, as described in the FAQ.

I was able to rip and decrypt this set without problems a couple days ago. Make sure that MakeMKV can access the internet to download the latest keys.

There can be multiple keys for the same title, but yes, do check internet access per FAQ.