2012/11/28 Denny Vrandečić denny.vrandecic@wikimedia.de:
So since ODBL and CCBYSA are not compatible, why would it be less of a source of possible conflicts and infringements of Wikipedia's content license to use ODBL instead of CC0?
I share Denny's worries.
If we adopt ODBL, all WMF projects *will have to* add a note about structured data taken from Wikidata (like "data are released in ODBL" or similar), or they should be bi-licensed (CC-BY-SA 3.0 Unported + ODBL what.ever).
If we keep licensing Wikidata with a CC0 (which is, in fact, a PD-like license), that allows Wikipedia to re-use data with CC-BY-SA 3.0 Unported without any problem. Then, when CC-BY-SA 4.0 will be released, we can migrate ALL projects to the new license.
I don't see any other possibilities - I do know something about licensing and stuff, but I may be wrong.