Here are the three options listed on opendatacommons.org, the licenses FAQ also has a bunch of really good information.
There is an here is an interview of Steve Coast (OpenStreetMap's founder)
Steve Coast: Licensing is incredibly important for the community to
trust that the data won’t be closed off. So we need to make sure that
data from OpenStreetMap will always be free and open. It’s also
important that we are able to stop anyone from trying to close it off
or derive from it without giving back to the community. We have a
multi-year process to re-license based on advice from multiple sources
that Creative Commons is not applicable to data. We wish it were, and
it probably will be in the future but it wasn’t clear when we began.
Until that happens we have a process to move to the Open Database
License, which explicitly covers data and not just creative works like
photographs or text. The ODbL was in fact started as a result of
investigations around the needs of Science Commons and we just helped
it to its conclusion.
Here is a guide (incomplete) from opendatacommons.ors on how licensing applies to data from different fields and different countries.