The document discusses Creative Commons licenses version 4.0 and their treatment of sui generis database rights. Key changes in version 4.0 include fully licensing sui generis database rights, new language addressing limitations, and defining the right to extract and reuse portions of licensed databases. However, some ambiguities remain around interpreting certain sections and how non-commercial use is defined. The document analyzes pros and cons of the new licenses but notes work is still needed to address open issues.