Perhaps I am nit-picking but....
ROSS "is a digital legal expert" that managed not to attribute its landing page's photo legally.
The photo is from here: https://commons.wikimedia.org/wiki/File:Stuttgart_Bibliothek...
And according to the licence (http://creativecommons.org/licenses/by-sa/3.0/), attribution credit as well as link to the cc license should be provided.
I think the idea is very cool by the way -- just trying to help!