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I thought the Knowledge Graph was based on Freebase[1]. [1] https://en.wikipedia.org/wiki/Freebase https://en.wikipedia.org/wiki/Freebase

• blattimwind 8y ago
  The text usually is from Wikipedia and the tabulated data seems to come from Wikidata.
  • kibwen 8y ago
    Wikipedia's text content is licensed under CC-BY-SA, which means that if Google isn't giving attribution somewhere then they would be in violation of the license.
    • dannyw 8y ago
      Google gives attribution when text content is used. For simple bibliographical information like who someone’s spouses is, it is not copyrightable, and no attribution is needed.
      • btown 8y ago
        Facts may not be copyrightable, but by academic standards they should still be sourced. Google doesn't derive shareholder value from training people to seek primary sources, though.