Lock down the wifi and if you have wired connections check where the wires go to.
Then it's all authorized by you.
I haven't thought about this much, but after reading people's posts on bandwidth stealing it is making want to secure my bandwith so it doesn't get unauthorized usage. I don't own a webpage (but I do know how to block unauthorized badwidth usage with websurfing). I, basically, want to protect my home cable connection from unauthorized bandwidth usage. Does anyone know very good software that can help prevent/block unauthorized bandwidth usage.