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JTB、最大793万人分の情報流出か どんな不備があったのか

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TOKYO, JAPAN - JUNE 14: Japanese travel agency JTB Corp logo is seen on June 14, 2016 in Tokyo, Japan. Japanese travel agency JTB Corp announced on June 14, 2016 that there was an unauthorized access to their group company i.JTB's server, and a possible leak of more than 7.93 million customers' contact information, including name, address, passport number etc. used for booking online. (Photo by MASASHI KATO/Getty Images) | MASASHI KATO via Getty Images