In late 2012, the OpenStreetMap project changed it licence from CC to the current ODbL. Every user who had contributed to OSM had to be contacted and asked if t

In late 2012, the OpenStreetMap project changed it licence from CC to the current ODbL. Every user who had contributed to OSM had to be contacted and asked if they accepted the new one, and if not, their contributions had to be deleted and retracted. It was very annoying.