The Protection scanners don’t find a protection as there are no protected files like on Windows games/apps.
It’s just the functional principle of the Navigation CDs’ protection that’s similar to Safedisc, Tages, etc.
You can check an image of your disc with Alexander NoÃ©’s Weak Sector Utility:
If there are any weak sectors you can try settings suitable for Safedisc in CloneCD or Alcohol 120%.
If it’s one of the other two mentioned you are out of luck.
P.S.: with the utility you can also check a simple ISO (with n=2048), doesn’t have to be a CloneCD image.