This document discusses the evolution of ISP liability and cooperation on copyright issues. It outlines the development of safe harbors for ISPs in the DMCA and EU that protect them from liability if they meet certain conditions. New forms of infringement like P2P have challenged this framework. The document proposes a graduated response approach where ISPs send warnings to subscribers engaged in repeat infringement and can eventually suspend accounts as a deterrent. It discusses country-level laws incorporating this and debates around related issues. The conclusion is that proportionate solutions are needed that steer users to legal options without widespread litigation.