 The general possibility of revoking one's former decision according to § 31a UrhG will prevent any comprehensive and legally binding licensing of known and yet unknown types of use (as usual in US-American law) within the framework of German copyright law in the future.§ 31a UrhG corresponds to the severe character of § 31 IV UrhG.It severely regulates the requirement of written form, the right of rescission and the conditions of expiry and omission of rescission as being indispensable in advance.