Yahoo's actual announcement on November 20 says they're using "a subset of Creative Commons images ('safe' photos with license type CC-BY and CC-BY-SA)." See:

Yahoo's actual announcement on November 20 says they're using "a subset of Creative Commons images ('safe' photos with license type CC-BY and CC-BY-SA)." See: https://www.flickr.com/help/forum/en-us/72157649323144986/page2/ https://www.flickr.com/help/forum/en-us/72157649323144986/pa...