U.S. District Judge Marilyn Patel issued her ruling Tuesday following a hearing that included testimony from Seattle-based RealNetworks.
Patel imposed a temporary restraining order last week at the request of lawyers representing major Hollywood studios and DVD CCA, a trade group.
RealDVD is being marketed as software that allows a user to burn his/her DVDs onto a computer hard-drive. The studios and DVD CCA are alleging it makes them more susceptible to piracy.