http://www.openstreetmap.org/copyright
© OpenStreetMap contributors
The data is available under the Open Database License, and the map tiles cartography is licensed as CC BY-SA. See OSM copyright web page. Alternatively, and as a requirement if you are distributing OSM in a data form, you can name and link directly to the license(s). In media where links are not possible (e.g. printed works), we suggest you direct your readers to openstreetmap.org (perhaps by expanding 'OpenStreetMap' to this full address), to opendatacommons.org, and if relevant, to creativecommons.org.