The hack was discovered on Sept. 15 and is more extended, for the period Sept. 1, 2013, and Sept. 16, 2015. The information exposed to hackers includes names, addresses, social security numbers, date of birth, and various identification numbers, including a passport, driver’s license or military identification number, according Experian. At this time there is no evidence that the data has been used inappropriately. The investigation is still underway. People who fear possibly consequences should sign up for the services at ProtectMyID.com. for two years of free credit monitoring and identity resolution service.