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The producers of James Bond films say an early version of the screenplay for the new movie "SPECTRE" is among the material stolen in the massive cyberattack on Sony Pictures Entertainment.

Eon Productions said Sunday it is concerned that third parties who received the screenplay might seek to publish it.

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The company warned it is subject to copyright protection and that "all necessary steps" would be taken to protect the rights of Metro-Goldwyn-Mayer Studios and Danjaq LLC, which is responsible for material related to James Bond on screen.

There's been speculation that North Korea is behind the cyberattack in retaliation for the upcoming comedy "The Interview." The film depicts an assassination attempt on North Korean leader Kim Jong Un.

North Korea has condemned the film, but denied the hack.

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— The Associated Press