Create decrypted backup from an encrypted backup?

[Rojma]

Is there a way to create a decrypted backup if you have an encrypted backup that was created using the MakeMKV backup option?

Backstory

I have a disc that wouldn't rip properly and kept getting hash errors. To fix the issue, I used ddrescue and the process documented in the following thread:

viewtopic.php?f=10&t=16920

Using ddrescue I was able to create an ISO and recover 100% of the disc. I followed the thread instructions of creating the discatt.dat file by doing an inital rip of the disc, followed by copying the BDMV folder from the rescued ISO. This worked and I was finally able to rip the content with no hash errors.

However, I like to have decrypted backup copies of all of my discs. Right now, I have the encrypted backup with the discatt.dat file, but I would like a decrypted backup instead. Since the Backup option only appears in MakeMKV when you insert a disc, I can't figure out a way to point to the encrypted backup directory with the discatt.dat file and tell it to create a decrypted backup. Thoughts or ideas?

[Rojma]

FYI, I forgot to mention that with the Windows version, I mounted the rescued ISO in Windows, which makes it look like a disc so that MakeMKV would think its a disc, and then tried to create a backup using the MakeMKV Backup option. However, this didn't work, I assume because ultimately the disc is encrypted and not actually the real physical disc. Would injecting the discatt.dat file into the ISO possibly make it work?

[dcoke22]

There's this thread from a few days ago: Unencrypted Backup from Encrypted Backup

[Rojma]

Thanks. Was looking in the wrong place. I am pretty sure I tried what they suggested and it didn't work, but I'll try again.

[Rojma]

Oh wait, I tried the original rescued ISO. I didn't create a new ISO from the encrypted backup. This might go along the same lines of injecting the discatt.dat into the rescued ISO, but I'll try just creating a new ISO from the encrypted backup.

[Rojma]

I followed the instructions in the linked post and it worked! Thanks again for pointing me to the other thread.