At present, the identity of the hacker or hackers behind the attack remains a mystery.
Sony said there is a high possibility the hacker stole personal information on millions of registered uses, but it has found no evidence that a database of credit card numbers was accessed. If true, that appears to rule out a financial motive behind the attack.
When asked by a reporter for his opinion on a motive behind the attack, Hirai said he could not speculate on the motive.
The IDG News Service