All intellectual property rights may be the subject matter of license agreements.
After preparation and execution such an agreement may be registered in the respective Register. It is not necessary to register the entire agreement, but a license declaration disclosing the essential data is sufficient.
By registration in the respective Register the license becomes a right in rem (i.e. it adheres to the respective property right independent of its owner) and effective vis-à-vis third parties. However, the registration of a trademark license has only declaratory effect, i.e. just serves to inform the public.
Intellectual property rights may also be the subject of liens which may be registered upon request in the respective Register of the respective Office (Patent Office, Plant Variety Office).