A bicycle licence is required here (Regina, SK, Canada) for every bike you own. It's per bike, though, not for the owner. $5 for a lifetime bicycle licence and it's technically illegal to ride a bike without one. Not that the police would ever stop you for not having one; enforcement is completely unheard of and most people don't even know you need a licence. I have licences on all of my bikes because it means that if/when it gets stolen, and found, they can actually return it to me.