Speaking with BBC Click, Sony executive Kaz Hirai admitted that the company “may never know” the full extent of what was stolen in the PlayStation Network security breach. He said the company knows “information was accessed”, but Sony could not be sure “what part [was] actually taken.”

“The people that intruded our systems are very good in hiding their tracks as they left our systems, so we might not know for a very long time or we may never know,” he said.

Hirai reiterated that Sony did not know if any credit card data was taken. He called the issue of hackers much larger than just Sony and said that the company has learned much about security from the debacle.

“It’s certainly not just a Sony issue, but more of a corporate issue for everybody. As you probably know, even in this past week or so there have been other organizations and companies where a similar sort of intrusion has occurred,” he added.

“Whether we’re talking about a large corporation like Sony as well as smaller organizations, whoever deals with personal information as well as credit card information needs to be very vigilant about how that data is being secured.”