Starting on January 1, 2017, the digital geospatial reference data of the surveying and cadastral administration of North-Rhine Westphalia, Germany, became open data under the German data license »dl-de/by-2-0«. This was the success of many negotiations between the Land and the municipalities which are in charge for the cadaster. From the technical point of view it was a challenge to implement open data within a few weeks. The article covers the entire process. It will address the government strategy, legal aspects and technical experiences of the download of data. As expected the example of North-Rhine Westphalia has already stimulated further discussions in other German Laender.