It seems impossible to take an encrypted backup and turn it into a decrypted backup. (i.e. makemkv goes directly to the title selection and makemkvcon backup requires a disc input). Any chance support for taking an encrypted backup and turning it into a decrypted backup can be added?
edit: take the encrypted backup turn it into an ISO and mount it in windows and then makemkv can create a decrypted backup (or at least it seems to be working).
However, this doesn't help me on linux.