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"Verlag" is just the German word for publishing house.

Which is, btw., entirely covered by the license as long as you allow redistribution and have proper attribution. Wikipedia is mostly covered by CC-BY-SA.

They belong to the Holtzbrinck Group [1]. They also operate a VC [2] and own or are invested in a lot of startups.

[1] https://www.holtzbrinck.com/

[2] http://www.hvventures.com/