Sorry for the bump, but I'm searching for the same answer.
I tried MakeMKV but both loading the iso files directly and using a drive emulator with the iso mounted returns an "illegal action" error.
I previously ripped the ISOs using AnyDVDHD, but the company went belly up and the program no longer works. I'm trying to rescue my library without having to start from scratch.
Any help is appreciated.
Edit: Perhaps because I was stupid or just because I wanted to be sure I was legal, I did not strip the copy protection when I ripped with AnyDVD which is why the ISOs now won't work without that program.