Executives, including Kazuo Hirai, the head of Sony's PlayStation unit, apologised for the security breach.
The theft has prompted legal action and investigations in the US and Europe.
"The organisation has worked around the clock to bring these services back on line and are doing so only after we had verified increased levels of security across our networks," said Mr Hirai in a statement.
He is seen as the frontrunner to take over as head of Sony Corp.
story source: www.bbc.co.uk/news/technology
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