General explanation of folders in BDMV files

[CapricornX10X]

Hello everyone ,
Would I be happy to explain what these folders are and what their role is? And are they necessary?
Blu-ray files have folders:
bdmv which of course I understand
But this :
CERTIFICATE
UHD!
ANYi

[rik1138]

How are you ripping the Blu-ray discs to your computer?

[CapricornX10X]

How are you ripping the Blu-ray discs to your computer?

In most cases I use tsmuxer. I'm just removing subtitles and audio that aren't necessary for me. And add a subtitle in my language.
I don't download quality and nothing like that. Really leaves it like the original disk except what I mentioned. So I ask what these folders are? And whether they are necessary

i play the blu-ray disc with powerdvd 20

[gonca]

ANY is an anyDVD folder and I believe it can be safely deleted, same for UHD
CERTIFICATE leave alone

[neil wilkes]

CERTIFICATE is only meaningful if the disc in question is authored using BD-J. Otherwise it is meaningless.
If you see it, the odds are you need it.