
ProSiebenSat.1 has posted a notice on the Planetside 2 Europe website to notify customers that an unauthorized party gained access to one of their systems. While it is unknown if data containing usernames and passwords (which are encrypted) was stolen, the publisher has taken steps to prevent unauthorized access by suspending accounts suspected of being affected by the breach.
All accounts that may have been subject to unauthorized access have received an e-mail in which we have requested the user to change their password. If you are not able to log into your game, this means that your account has been suspended for security reasons. You can reactivate your account by following the link below and creating a new password. http://www.planetside2.eu/en/forgot_password
You can read the entire post at the link below, as well as an addition email address to contact in case your account has been deactivated and you are unable to retrieve it.
(Source: Planetside 2)