 So there is a possibility to control the use of one's work by specifying the types of use, thereby limiting the rights of use.The binding regulation as stated in § 31 IV UrhG made the concession of rights of use for yet unknown types and the legal obligations resulting therefrom ineffective and it limited the rights of use down to only the types of use known at that time.It was intended that the author should be protected to the best possible extent against an unlimited exploitation of their rights due to types of use which could not be foreseen at the time of conclusion of the contract.