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Millions of historical images posted to FlickR
you can’t always use every photo you find online. so Office will automatically apply a filter to only show Bing results under the Creative Commons license http://thenextweb.com/insider/2014/12/01/microsoft-away-clip-art-replaces-bing-images/
"Bing Image Search uses a copyright filter based on the Creative Commons licensing system. The results that are returned are images that have been tagged with Creative Commons licenses. A link to the source of the image is provided, which you should use to review the source of the image and the applicable license to determine whether your use will comply with the license. (The settings can be switched to show all web results to view more images.)." http://blogs.office.com/2014/12/01/clip-art-now-powered-bing-images/
"...However, you are responsible for respecting others’ rights, including copyright. Learn more here"