 The types of use have changed and evolved in the course of technical development and they still continue to do so.The term “kind of use” refers to "all technically and economically concretised utilisation of an author's work, meaning that the parties to a contract have specified the use of the work as required for achieving the contractual purpose.The kinds of use listed in § 15 UrhG can be subdivided into several rights of use which again can be matched, each, with a corresponding type of use, so it is always possible to restrict a right of use in many different ways as long as the specification of the use of work makes clear the individuality of the type of use with respect to its economic and technical content.