Early Friday morning, the hotel behemoth Marriott announced a massive hack that impacts as many as 500 million customers who made a reservation at a Starwood hotel. Marriott acquired the Starwood hospitality group in September 2016, which operates numerous hotel brands including Sheraton, Westin, Aloft, and W Hotels. But the intrusion that caused the enormous data breach predates Marriott's acquisition, beginning in 2014.

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