In his first public comments on the massive cyber-attack, which the U.S. government has blamed on North Korea, Hirai said current and former employees of the studio were "the victims of one of the most vicious and malicious cyber-attacks we have known in recent history."
The attack debilitated Sony Pictures' computer network in November and led to the online leaks of unreleased movies and embarrassing emails. The company was also criticised for cancelling the release of the comedy "The Interview" after threats from the hackers, before reversing that move following criticism from U.S. President Barack Obama.
"Freedom of speech and freedom of expression are lifelines of Sony and our entertainment business," Hirai said during a presentation at the Consumer Electronics Show (CES) in Las Vegas.
He did not take questions from reporters.
In addition to the cyber-attack, Sony has also been grappling with weak sales in its electronics business. It is heading for its fifth net loss in six years, and has lowered its outlook for the sixth time under Hirai's watch.
But one bright spot for Sony's electronics business has been its video games. Sony announced earlier that sales of its PlayStation 4 video game consoles exceeded 18.5 million units as of January 4, up from 13.5 million at the end of October, showing solid holiday demand.
Sony on Monday also announced new updates to its broad range of electronics products, including a new wearable device, the SmartWatch 3, with built-in GPS sensors.
© Thomson Reuters 2015
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