See my above comments wrt F/OSS search engines.OSM is currently licensed under CC-BY-SA, but they're changing it to their own:
http://www.osmfoundation.org/wiki/License/We_Are_Changing_The_License It appears to be a free-license: http://www.opendatacommons.org/licenses/odbl/summary/ http://www.opendatacommons.org/licenses/odbl/1.0/ I also believe their software is free software, though I'm not sure.
