On some pages you have the possibility to enter personal or business data (e. g. e-mail addresses, names, postal addresses, etc.). The disclosure of this data is voluntary. If technically feasible and where reasonable, all services offered can be used without disclosing personal information or by use of anonymised data or aliases. Exceptions are forms for ordering publications or other materials, registration forms for events or accreditation forms. Third parties are prohibited from sending unsolicited information to mailing addresses, phone or fax numbers or e-mail addresses published on the imprint page or similar pages. We reserve the right to take legal action against anyone violating this prohibition by sending so-called spam.