Maybe this is because AnyDVD removed "key.txt" support.
keysdb.cfg It still compatible to AnyDVD 8.2.1.7.
Why remove support of it. If makemkv has the hashed key for ones UHD-disc, but AnyDVD should not (maybe) occasionally,
the affected user just needs to use hashed-key to keysdb.cfg-converter from makemkv.
Well I'd find it handy to preserve keys.txt in AnyDVD.
I didn't say anything at all that the new OPD support for UHD was bad.
Can't it exist well in coexistence?
What is the disadvantage of preserving "keys.txt" (even if older format type) ?
Well makemkv can convert hashed key to keysdb.cfg, can it not?
To me it looked like makemkv was doing format-processing (not involving a keysdb.cfg list from known older discs)
And is the other hash/VUK part or whatever needed for decrypting still missing in keysdb.cfg from makemkv??
It's all confusing, as AnyDVD implemented this file format feature, and people could use it to fed AnyDVD with it for decryption.
And afaik it seems to me that there was no other decryption information part involved from AnyDVD at that time (maybe).