Note that it's talking about the data, not the map/art. It's a bit more subtle than most open source licenses. The ODbL distinguishes between the data and oth

Note that it's talking about the data, not the map/art. It's a bit more subtle than most open source licenses. The ODbL distinguishes between the data and other things made with it. From that page: "What exactly do I need to share? ODbL draws a distinction between data, (geodata), and works produced from the data, (maps). You are probably distributing data if you are involved in searching, routing, geocoding. You are probably distributing maps if you print paper maps, have a website with map tiles, or are displaying a map as part of a larger work such as a television show, film, advertisement or book. [...] - If you correct or extend our data, you need to share your new data. - If you make a map from our data, you may publish the map itself under any license you like, including commercial. You DO however, have to share the underlying data [...]"