The Head of Department (or an appointed person)
This is what the head of subject should do if the supervisor informs him/her that the master’s thesis includes confidential information:
The head of subject must note that he/she is bound by the obligation of professional secrecy regarding confidential master's theses.
The thesis evaluators
If the thesis includes confidential material, the evaluator should note that he/she is bound by the obligation of professional secrecy.
An external evaluator should sign an NDA, which he/she will get from the head of the subject.