If the opportunity for the input of personal or business data (email addresses, name, and addresses) is given, the input of these data takes place voluntarily. The use and payment of all offered services are permitted – if and so far as technically possible and reasonable – without specification of any personal data or under specification of anonymous data or an alias. The use of published postal addresses, telephone or fax numbers and email addresses for marketing purposes is prohibited; offenders sending unwanted spam messages will be punished.