[vidarh]

Their license used to be horrible for commercial use, but mostly because it was an extremely bad fit for a data collection, leading to lots of confusion over what was ok and not.

A better comparison for their current license would be the LGPL - as long as you keep your proprietary data separate from the OSM data, you don't need to release it but you still need to release any changes to the OSM data itself.

[yellowbkpk]

To be clear, the license has not changed yet. We're in the process of changing the license (and they recently announced [0]) that the next full-planet data dump will be under the new license, but it hasn't been switched yet.

[0] http://blog.osmfoundation.org/2012/09/06/your-first-odbl-pla...