Game ID is embedded in the ISO header and can be used to verify your copy. If you ever encounter a mismatched or corrupted file, re‑downloading or re‑ripping is the recommended fix.
If you are looking for specific troubleshooting for Dolphin Emulator, or need help setting up a softmodded Wii to load your own backup,
This method is 100 % legal (in most jurisdictions) and guarantees you have a clean, unmodified copy of the game.