 RealNetworks argued that it fully complied with the CSS license agreement not only by preserving all of the associated protection but also by adding Advanced Encryption System (AES) encryption to the copied content so that only the person who made the copy can play back the copied content with RealNetworks' player.However, the court decided that preserving the CSS protection only once during the initial playback of the DVD is not enough and any subsequent absence of CSS technology during the playback of copied DVD content from the hard drive is a contract violation.On May 14, 2009, RealNetworks amended the lawsuit to include antitrust claims against DVD CCA and the major studios, alleging that the delayed product launch of RealDVD, temporary restraining order and preliminary injunction are the results of DVD CCA and the movie studios conspiring to deny the licensing of CSS to make hard drive copies of DVD content.