Thank you for the quick reply.

I am looking forward to contribute offical data.

Representing a governmental source, which is one of many contributors in OSM, it will be fine if the attributes will display the name of the source for further information or direkt contact. Even contributors page will be enough. It will be checked if adjusting the liscence is possible

This topic will move to the german forum (https://forum.openstreetmap.org/viewtopic.php?id=76172)

For ony further questions I am more than happy to get in touch.