As part of its attempt to woo back gamers to the PlayStation Network, Sony had announced that it would be offering a year's free membership in the AllClear ID Identity Theft Protection service for all PSN and Qriocity customers.
Registration for this free service is now open, all you have to do is go to the registration website and enter the email address you used to create your PlayStation Network or Qriocity account.
Here's a description of the service provided by Sony:
AllClear ID PLUS is a premium identity protection service that uses advanced technology to deliver alerts to help keep you safe. The service also provides identity theft insurance coverage and hands-on help from expert fraud investigators. Sony has arranged, at no charge to eligible PlayStation Network and Qriocity account holders, for twelve months of this service to be provided by Debix to those who choose to enroll.
AllClear ID Plus Registration Page for PSN Customers