Hollywood calls it “rent, rip and return” and contends it’s one of the biggest technological threats to the movie industry’s annual $20 billion DVD market – software that allows you to copy a film without paying for it.

On Friday, industry lawyers urged a federal judge to bar RealNetworks Inc. from selling software that allows consumers to copy their DVDs to computer hard drives, arguing that the Seattle-based company’s product is an illegal pirating tool.

RealNetworks’ lawyers countered later in the morning that its RealDVD product is equipped with piracy protections that limits a DVD owner to making a single

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