I have been having this error for a while now. Regardless of what disc I used. The logs would say Medium error, then invalid copyright and finally fail.
I was able to fix it on my system. Windows 8, v1.8.1
This is what I did
1) View -> Preferences
2) Select General Tab
3) Change "C:\Users\[Your Account Name]/.MakeMKV" to "C:\Users\[Your Account Name]\.MakeMKV" ... Note the direction of the final 'backslash'
Once I changed that and restarted MakeMKV everything worked.
I hope this helps others
Scsi error - MEDIUM ERROR ... Possible Fix
Re: Scsi error - MEDIUM ERROR ... Possible Fix
Not to doubt you, but.... if changing a / to a \ "fixed" a medium error, Windows 8 is severely broken. In all versions of DOS and Windows since DOS 3.1, the "/" and "\" have been treated as identical in file names, INTERNALLY. COMMAND.COM and CMD.EXE are a different story, but the operating system itself would work either way. It's for compatibility with UNIX programs that might be ported to Windows.
MakeMKV Frequently Asked Questions
FAQ about BETA and PERMANENT keys.
How to aid in finding the answer to your problem: Activating Debug Logging
FAQ about BETA and PERMANENT keys.
How to aid in finding the answer to your problem: Activating Debug Logging