: A hacker group that previously hit Steam, Origin and Battle.net with distributed denial-of-service attacks , claims that it has access to usernames, passwords and credit card data for million of accounts on various video game systems.According to tweets from the group knows as "DERP," and as spotted by Cnet , thousands of usernames and passwords for the PlayStation Network and Windows Live accounts have been leaked -- and the group says it has many more.In fact, the group says it even has credit card details for hundreds and thousands of users, and around 7 million usernames and passwords, including 1.7 million Origin account details.It's advisable that, if you have an account with one of these platforms, you may want to change your password.: Kotaku has published an article which casts doubt on the hack, and which is worth a read. Gamasutra has contacted Sony for comment but as yet has not received a reply.: On Friday evening, a Sony spokesperson provided a statement to Gamasutra denying the hack took place. Here is the statement in full: "We have investigated the claims that our network was breached and have found no evidence that there was any intrusion into our network. Unfortunately, Internet fraud including phishing and password matching are realities that consumers and online networks face on a regular basis. We take these reports very seriously and will continue to monitor our network closely."