The 3D City Database and all bundled tools are free and open source software under the Apache License, Version 2.0. See the LICENSE.txt file shipped with the software for more details. For a copy of the Apache License, Version 2.0, please visit http://www.apache.org/licenses/.
You can use the 3D City Database in both personal and commercial products in accordance with the license without fees or usage restrictions.
Attention
You must observe the license and use terms of the spatial database systems you are running the 3D City Database on (PostgreSQL/PostGIS or Oracle).
The source code of the 3D City Database is hosted on GitHub at https://github.com/3dcitydb. Contributions are very welcome!