The music industry came out on top in one of its first attempts to hold an internet service provider liable for its subscribers’ unauthorized peer-to-peer file sharing.

The decision, handed down by the Fourth Circuit Court of Appeals in a dispute between BMG Rights Management and Cox Communications, outlines the obligations an ISP must fulfill to receive safe harbor protection under the Digital Millennium Copyright Act for a subscriber’s infringement. It also explains when an ISP can be held contributorily liable for its subscribers’ actions.