Sony security breach has 'frustrated' gamers
27 April 2011 Last updated at 17:33 BST
Sony is warning users of its PlayStation network that their personal information, including credit card details, may have been stolen.
Access to the network was suspended last Wednesday, but Sony has only now revealed details of what happened.
Users are being warned to look out for attempted telephone and e-mail scams.
Rik Ferguson is both a PlayStation user and a computer security expert and spoke to the BBC's Rory Cellan-Jones about what the breach means for gamers and the future of Sony.