If the opportunity for the input of personal or business data (email addresses,
name, 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
technically possible and reasonable - without specification of any personal
data or under specification of anonymized 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.