Det Centrale Personregister (CPR) is a register run by the Danish Ministry for Economic Affairs and the Interior. The service is responsible for the allocation of Danish national identification numbers (CPR numbers), and allows authorities and companies to access data stored on all persons, roads, homes, and government agencies registered in Denmark. Access to CPR is heavily regulated and entities who wish to use it must be approved beforehand. CPR is a very useful source of information for government agencies, financial institutions, and other similar entities operating in Denmark.
Adapted from https://www.cpr.dk/om-cpr-kontoret/, accessed 2019-01-10