Germany's official IT-watchdog is criticising Sony for failing to provide sufficient information on the data security of its newly restored PlayStation network. Germany's Federal Office for Information Security said on Friday the information provided by Sony "has failed to quell doubts" on the network's security following last month's massive breach that affected over 100 million online accounts. It said the Japanese firm has left several questions unanswered and also failed to meet with the agency. Sony's PlayStation network is a system that links gamers worldwide in live play. Sony began partially restoring its PlayStation Network service in the US, Europe and elsewhere on Sunday after shutting down the service following the April 20 security breach.