If you're a playtester then it's alright for you to keep it on your wii they just ask that you don't give it to people, post feedback/videos etc. They're considering dropping people who don't contribute which is why I'm mentioningIndeed I am, but it isn't a big enough deal to me. How can they tell when **** gets leaked? Can they tell the presence on SD cards?
And people aren't very subtle. When people have copies they talk about it
Though they have a few other ways of knowing...