I suspect.. and only suspect.. the game licensed the name and Eddie character from Iron Maiden. I doubt the band is actually the driving factor behind the game. i.e. Iron Maiden the band, doesn't own Naughty Frog. Naughty Frog pays Iron Maiden royalties for using their intellectual property. It's far more a symbiotic business relationship than a direct Band venture. I notice most of the music is a close approximation to the actual songs, but it's not exactly 100% accurate in many cases.