If you do research work as a doctoral candiate at Kiel University without an employment contract, e.g. in a laboratory or on one of the university farms, you have the possibility of concluding a Gestattungsvertrag (licensing agreement) with your supervisor in which the rights and duties of both parties can be specified.

You can find a model agreement here (German) and here (English). Please note that only the German version of such an agreement is legally binding. The model agreement can be modified to reflect the particular situation of the doctoral candidate. The institute in question, the faculty, represented by the dean's office, and the legal counsel of Kiel University, Ms. Daniela Geißler, must approve of the final agreement.