A class action lawsuit was filed against Sony a day after the company publicly admitted that personal information from PlayStation Network was compromised by a security breach. The lawsuit was filed by the Rothken Law Firm today in a California court and alleges Sony "failed to take reasonable care to protect, encrypt, and secure the private and sensitive data."

Yesterday, Sony said it believes an unauthorized person obtained PSN user information, including members' names, addresses, birthdays, and login passwords. The company said there was no evidence that credit card information was stolen, but did not rule out that possibility.

"We brought this lawsuit on behalf of consumers to learn the full extent of Sony PlayStation Network data security practices and the data loss and to seek a remedy for consumers. We are hopeful that Sony will take this opportunity to learn from the network vulnerabilities, provide a remedy to consumers who entrusted their sensitive data to Sony, and lead the way in data security best practices going forward," said Ira P. Rothken an attorney who filed the class action complaint.

"Sony's breach of its customers' trust is staggering. Sony promised its customers that their information would be kept private. One would think that a large multinational corporation like Sony has strong protective measures in place to prevent the unauthorized disclosure of personal information, including credit card information. Apparently, Sony doesn't," commented J.R. Parker, co-counsel in the case.

The lawsuit seeks monetary compensation for the data loss and "loss of use of the Sony PlayStation Network, credit monitoring, and other relief according to proof."

IGN has contacted Sony for comment.

A copy of the complaint in PDF form can be viewed here.