Hackers have sent a new email to Sony Pictures Entertainment, gloating over the studio's "wise" decision to cancel the release of "The Interview" and warning not to distribute the film "in any form."

The email was confirmed Friday by a person close to the studio who requested anonymity because the person wasn't authorized to speak publicly about the matter. It was sent to several employees of the Culver City, California, company that's been roiled by a hacking group calling itself Guardians of Peace.

"Very wise to cancel 'the interview' it will be very useful for you," read the message. "We ensure the purity of your data and as long as you make no more trouble."

The email also warned against any release of the Seth Rogen, James Franco comedy and insisted that "anything related to the movie, including trailers" be removed from the Internet.

"Now we want you never let the movie released, distributed or leaked in any form of, for instance, DVD or piracy," wrote the hackers.

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Sony Pictures has been removing all signs of "The Interview" from its websites and taken its trailers off YouTube.

The Obama administration on Friday formally accused the North Korean government of being responsible for the devastating hacking attack.

Thousands of Sony executive emails and other documents have been posted online, employees and their families were threatened, and unreleased films were stolen and made available for illegal download since the Nov. 24 hack.

The hackers then escalated this week to threatening 9/11-like attacks against movie theaters scheduled to show the Sony film "The Interview."

That fanned security fears nationwide and resulted in the four top U.S. theater chains pulling the film from their screens, ultimately driving Sony to cancel the film's release.

The Associated Press contributed to this report.