So let’s say you bought a new mac and cloned your old hard drive to the new one, and now your netflix is all sorts of busted. Let’s fix that shall we? Netflix uses silverlight for DRM which creates a file that IDs your computer hardware for licensing. So we delete that file… It’s here: /Library/Application Support/Microsoft/PlayReady/mspr.hds
Go find it, throw it away and restart your browser. Wha-boom! You’re in business.