The new UAV regulations are now active in Germany! For commerical and research flights things are more simple now for copters below 2kg. There is now a general allowance in place for the full federal region of Germany for UAVs below 2 kg (with the restricted regions as listed in the regulations). For copters with more weight a specific training certificate is needed and up from 5kg you need an allowance of the regional  aeronautical authority.

https://www.kopter-profi.de/index.php/faq/aktuelle-drohnen-gesetze-deutschland-drohnen-verordnung