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RealNetworks’ DVD-copying software will remain off the market after Walt Disney and other movie studios won a ruling that the product violates laws protecting copyrighted works.

US District Judge Marilyn Patel in San Francisco issued a ruling yesterday blocking all versions of RealDVD, the $30 software that allows consumers to save one backup copy of a movie to a computer hard drive.

The copy can be played on that computer and on as many as four others running RealDVD.

RealDVD “circumvents a technological measure that effectively controls access to or copying of the studios’ copyrighted content on DVDs,” Patel wrote in the order.

Hollywood’s leading trade group, the Motion Picture Association of America, applauded the ruling.