Open Data is NOT only data that you can access without paying a fee or similar.

Google Maps distributes, for example, proprietary data which neither has an open license, nor can be used without dealing with complex permissions and terms of use. OpenStreetMap, on the other hand, is a genuine Open Data project. Open data and content can be freely used, modified, and shared by anyone for any purpose. Not every data is “Open” even though the data producers can claim full openness. An open work must satisfy the following requirements in its distribution: