Section 1758 Bürgerliches Gesetzbuch (= German Civil Code):

Prohibition on disclosure and exploratory questioning

(1) Facts that are suited to reveal the adoption and its circumstances may not be revealed or discovered by exploratory questioning without the approval of the adoptive parent and of the child unless special reasons of the public interest make this necessary.

 

(2) Subsection (1) applies with the necessary modifications if the consent under section 1747 has been given. The family court may order that the effects of subsection (1) occur if an application for substitution of the consent of a parent has been made.