There is no general ruling for Lower Saxony.
You can find contact details and further information from the Lower Saxony State Aviation Authority here.
For a drone flight that requires a permit in the "open" category, as the regulations on geo-zones in accordance with Section 21 h of the German Air Traffic Regulations (LuftVO) cannot be complied with, you can apply for an
If an operating licence for the "special" category is required for the planned flight, in accordance with § 21b LuftVO, an
(Further information on the operating categories can be found
There is a Germany-wide general ruling on the granting of air traffic control authorisations. These are intended for drone flights in control zones of airports with German Air Traffic Control (DFS) and state that flights up to an altitude of 50 metres are possible without permission.