I tried the first Super Mario Maker save that was posted and it worked fine. I'm not sure if out of region would work or if using say a loadiine save on a disc version would work either. No I don't think they are decrypted in any way they probably could be tampered with but would they work after, not sure?. Good thinking though, it would be good if it did work and we could say change a new save in to a completed save file for example for loadiine to cheat the game. Or say we could somehow inject a created Super Mario Maker level from an original dumped save file and load them with a loadiine save file and use them without the need of online sharing