According to the OpenData licence, all data can be safely assumed to be under a CC-by 3.0 license - the T&C Explicitly say so:
Creative Commons
These terms have been aligned to be interoperable with any Creative Commons Attribution 3.0 Licence. This means that you may mix the information with Creative Commons licensed content to create a derivative work that can be distributed under any Creative Commons Attribution 3.0 Licence.
If you want to use outside of that licence, then speak to a lawyer, or read over the licence yourself
