looks like nintendo didnt care to fix their bug before pressing all those korean SSBB discs. This is an exploit that allows korean and european users to run unsigned code on their Wii consoles.
PS. ive seen people saying that this is running on some sort of emulator. it is not, and you are stupid. this is a real disc running on a real wii connected to a real TV. you are looking at a webcam pointed at a tv.