Film studio Twentieth Century Fox has applied to a Los Angeles court to block the release of Watchmen, based on the comic books written by Alan Moore.
Fox, which says it bought film rights to the series in the 1980s, has been given the go-ahead to launch an injunction against rival Warner Bros.
"We respectfully disagree with Fox's position and do not believe they have any rights," a Warners spokesman said.
Fox said it "will be asking the court to enforce Fox's copyright interests".
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