This image, originally posted to Flickr, was reviewed on 25 September 2015 by the administrator or reviewerTuvalkin, who confirmed that it was available on Flickr under the stated license on that date.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.