www.makemkv.com

I already decrypted it and created the MKV. I will continue to check my protected ISO until MakeMKV supports it. But yes, it can take anywhere from a couple hours sometimes to multiple weeks others. It all depends on how busy Mike is. Patience is definitely required if you don't have multiple means...

Same, getting:

The volume key is unknown for this disc - video can't be decrypted
Failed to open disc