http://blog.us.playstation.com/2011/...city-services/

Q: Was my personal data encrypted?
A: All of the data was protected, and access was restricted both physically and through the perimeter and security of the network. The entire credit card table was encrypted and we have no evidence that credit card data was taken. The personal data table, which is a separate data set, was not encrypted, but was, of course, behind a very sophisticated security system that was breached in a malicious attack.

Q: Was my credit card data taken?
A: While all credit card information stored in our systems is encrypted and there is no evidence at this time that credit card data was taken, we cannot rule out the possibility. If you have provided your credit card data through PlayStation Network or Qriocity, out of an abundance of caution we are advising you that your credit card number (excluding security code) and expiration date may have been obtained. Keep in mind, however that your credit card security code (sometimes called a CVC or CSC number) has not been obtained because we never requested it from anyone who has joined the PlayStation Network or Qriocity, and is therefore not stored anywhere in our system.

Q: What steps should I take at this point to help protect my personal data?
A: For your security, we encourage you to be especially aware of email, telephone, and postal mail scams that ask for personal or sensitive information. Sony will not contact you in any way, including by email, asking for your credit card number, social security number or other personally identifiable information. If you are asked for this information, you can be confident Sony is not the entity asking. When the PlayStation Network and Qriocity services are fully restored, we strongly recommend that you log on and change your password. Additionally, if you use your PlayStation Network or Qriocity user name or password for other unrelated services or accounts, we strongly recommend that you change them, as well. To protect against possible identity theft or other financial loss, we encourage you to remain vigilant, to review your account statements and to monitor your credit reports.