Just as matter of interest, I read in a magazine, could well have been Webuser quite some time ago, that if a bandwidth theft took place, and obviously it does happen (perhaps not as blatant though as this occurrence), should the 'victim' take any sort of action leading to some sort of court appearance, the magistrate or judge would probably throw it out of court on the grounds that if the alleged victim can't, won't or doesn't know how to protect his/her system from 'snoopers', it's the 'victims' own doing.
A reference to "just like tuning into a radio stations frequency" may have been stated.

Moral of the story is, get your system protected.
If you don't know how, seek advice from here or a professional source.