OSM Buildings also provides from alternative open data sources which are subject to their respective licenses. These sources are not part of and not connected to OpenStreetMap.
OSM Buildings uses Nominatim for search and geocoding.
OSM Buildings viewers's source code is open and free to use for everyone as long as copyright notice / attribution is attached.
We are using 3rd party map viewers for demonstration of our data.
These viewers are copyrighted by their respective creators.