All Norwegian banknotes are equipped with security features that enable a genuine note to be identified. There are features that can be seen with the naked eye such as: holographic foil strip, watermark, security thread and strip with iridescent effect.
The number of counterfeit Norwegian notes is small compared to the number used daily for making payments, but if you receive a counterfeit note, you are the one who loses. You should report any attempts to pay with counterfeit notes to the police. You should also go to the police if you discover counterfeit notes in your own possession.