The defendant used an invalid clause in its general terms and conditions, which stated: "The company reserves the right to provide customer data to other companies in a legitimate way for the purpose of the dispatch of information and reserves the right to use customer data for its own promotional purposes."
The plaintiff requested a cease-and-desist order for the use of this clause, based on § 4 No. 11 UWG (the German Unfair Competition Act) in connection with §§ 305 et seq. BGB (German Civil Code).
§4 No. 11 UWG can be invoked in case of a violation of a law regulating the market conduct. Therefore, the use of an invalid clause within general terms and condition could constitute a violation according to § 4 No. 11 UWG if general terms and conditions -- or §§ 305 et seq. BGB, which regulate general terms and conditions -- qualify as a legal norm which regulate market conduct.