Under which licence is the SKOS vocabulary published?

Dear Semantic friends,

Under which data licence is the SKOS vocabulary published?

What I have tried:

   1. I have looked at the SKOS documentation page (
   https://www.w3.org/TR/skos-reference/), which links to a page about
   copyright (https://www.w3.org/policies/#Copyright), but that is a very
   generic page, that does not specific the data licence specific
   vocabularies. There are no other obvious links to licence information
   (unless I overlooked something).
   2. Many vocabularies include licence information in their metadata
   description (often with the 'dct:license' property), but in the case of
   SKOS, this property is not included.

Besides the specific licence for the SKOS vocabulary, which strategies --
other than these two methods -- do people in the community use to determine
the licence for the W3C vocabularies that they use?

---
Cheers,
Wouter.

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Wouter Beek

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