SDS means "Statens Datasentral" (The Federal Data/info central) in Norway. It's where our names, birthdates, addresses,
social security numbers, car registrations,
criminal record, tax record, buisness record and a lot more is stored.
SDS is now regrouped to a state-owned company with a monopoly on storing vital data on Norway's citizens. The monopoly is in effect to protect the privacy of such data.
SDS sounds like a mental chainsaw massacre to any overly paranoid person. But the fact remains that the goverment can't function without this kind of information. Also, by storing all this information in a central database, it is easier to comply with the strict laws that SDS operates under.