Open Source Photos, free high res images – New site look and feel
opensourcephotos.wordpress.com
opensourcephotos.wordpress.com
This issue came to my mind when I saw this photo http://opensourcephotos.wordpress.com/2014/11/10/sachsenhaus...
UPDATE: Found this link which seems to answer your question: http://www.publicdomainsherpa.com/trademark.html -- I have also added info about this in the footer of every page. Thanks again for your input!
Great site though as I say!