Re: But...
You don't - and that would be your argument in court if they tried to come after you, they have to prove that YOU the individual has committed the heinous crime of downloading the latest episode of Game of Thrones. However, if they had enough proof and were somehow granted a warrant to have your house searched and they found said infringing media on your sons computer - it would be them who would end up prosecuted.
The EFF have already said that by opening up a small percentage of your network to be a publicly accessible, unencrypted hot spot (think BT Fon, or if you have DD-WRT etc a "Guest Network") this will pretty much cover you in court as it couldn't be proven if you had actually done it.
Biting the hand that feeds IT
