 RealNetworks contended that Sony ARccOS and Macrovision RipGuard are not effective copy control measure because they only prolong the copying process.The district court rejected this argument because ARccOS and RipGuard may make copying take so long that copying is essentially not viable.RealNetworks then argued that ARccOS and RipGuard are never encountered during normal playback, leaving a back door to copying wide open, thus, they are not effective copy control measures.