Hi!
How about adding an ODbL licensed service? Would it be
possible? I am
thinking about SPOI <http://sdi4apps.eu/spoi/> and their SPARQL endpoint
<http://data.plan4all.eu/sparql>..
ODBL seems to be in the same vein as CC-BY-SA, so if CC-BY is ok, that
should be OK too. Please add the descriptions to
https://www.wikidata.org/wiki/Wikidata:SPARQL_federation_input
--
Stas Malyshev
smalyshev(a)wikimedia.org