The US Supreme Court ruled unanimously that Cox Communications is not liable for copyright infringement committed by its internet customers.Justice Clarence Thomas wrote that providing a public service does not constitute active assistance in piracy even if some users break the law.Sony Music and other labels had sought damages for the sharing of 10,000 works, leading to a prior $1 billion jury award that is now reversed.The decision protects internet providers from being forced to disconnect households and institutions based on unverified piracy accusations.