 RealNetworks licensed the Content Scramble System (CSS), a technology commonly used on copyrighted DVDs to prevent unauthorized copying, from DVD CCA and released the product RealDVD that allows users to make hard drive copies of copyrighted DVDs.However, some major movie studios feel that RealDVD can threaten the emerging market in digital downloads and encourage people to make copies of rental DVDs instead of purchasing.RealNetworks, on the other hand, believes that copying of DVD is now legal after the favorable ruling of a 2007 California Superior Court case against Kaleidescape, a manufacturer of high-end media servers capable of copying copyrighted DVD content to the servers.