decrypting 4k Blu Ray files

[filmfreak2021]

Hello

I have the digital files from the 4k Blu Ray disc of the greatest showman. I want to convert those digital files (an AACS folder, BDMV file and a CERTIFICATE folder to the MKV format, but MakeMKV tells me that it can't decrypt the files. How can I make it possible to rip the movie out of those files?

filmfreak2021

[Woodstock]

If MakeMKV created the backup, there will be a file that holds the necessary information for decryption named discatt.dat. If you do not have that, you will have to either generate it, using the original disk, or get a decryption key independently.

[filmfreak2021]

Thank you for replying!

Where can I get decryption keys independently? MakeMKV didn't create the backup and I also don't see a file named discant.dat.

I do have the original disk but my Blu Ray drive is not capable of ripping 4k Blu Ray. But I was able to copy the movie files and folders over to my hard drive.

[Woodstock]

Searching came up with this link: viewtopic.php?f=12&t=17087&p=60530&hilit=discatt#p60530

The assumption is that you have access to the same drive that copied the files, because of bus encryption that would be involved. Start a backup (without decryption), and you can abort it after the discatt.dat file is created.

Independent would be finding a copy of keydb.cfg that has the decryption key for your particular disk in it (there can be more than one per title, for different markets). This way is a pain to deal with, though. I tried it a couple of times.