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.