Licensing of ChEMBL Data - RFC

I have been thinking long and hard about the actual process for the public distribution of the ChEMBL data, and nothing is decided yet; however, I think it is likely that there will be a license for the distribution. In line with some of the existing 'free' EMBL-EBI resources, this is likely to take the form of one of the Creative Commons licenses (see http://www.creativecommons.org for more details. So as a question, what experience do people have with these licenses, as applied to public domain databases?

Oh, The license we are most like to use is.....  Basically this allows redistribution and the production of derivative works, while applying conditions that attribution must be provided, and that any derivative works will be similarly shared.