Cars enter and depart from Sony Pictures Entertainment studio lot in Culver City, Calif., Thursday, Dec. 18, 2014. Companies across the globe are on high alert to tighten up network security to avoid being the next company brought to its knees by hackers like those that executed the dramatic cyberattack against Sony Pictures Entertainment. The hack, which a U.S. official has said investigators believe is linked to North Korea, culminated in the cancellation of a Sony film, "The Interview," and ultimately could cost the movie studio hundreds of millions of dollars.  (AP Photo/Damian Dovarganes)

ATLANTA (AP) — Companies across the globe are on high alert to tighten up network security to avoid being the next company brought to its knees by hackers like those that executed the dramatic cyberattack against Sony Pictures Entertainment.

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