What do you do when your roommate downloads songs and software onto his or her computer nonstop? What happens if the authorities catch whiff of this and want to prosecute? I could imagine your not wanting to police your roommate’s Internet activities. Then again, I’m sure you don’t want to face any penalties for your roommate’s behavior. Is there a way to document Internet traffic and monitor who downloads what, in case you ever have to prove your innocence? Lifehacker poses this question with some interesting answers.