The rules were formulated by the Norwegian Civil Air Authority (N-CAA), published in May 2016, and updated 16 September 2016. Here they are in English: Regulations concerning aircraft without a pilot on board etc - In addition, commercial pilots must take an examination, similar to the US-FAA's 14 CFR Part 107 knowledge test. The computer exam consists of multiple choice questions which have 4 choices, only one of which is correct. 75% of the candidate's answers must be correct to pass the exam. (I wonder if the FAA and N-CAA will negotiate a reciprocity agreement whereby each country will accept certifications of the other country so certified remote pilots may fly in each other's national air space?) Hobbyists must submit an application to the N-CAA for each "undertaking" but need not be certified pilots.