<http://schema.org/description>
"Google is making image search more convenient for those who are seeking pictures to use in their publications -- it is letting you sort images by licensing rights under 'Search Tools.'\r\nNow ..."^^<http://www.w3.org/2001/XMLSchema#string>
<http://thenextweb.com/google/2014/01/14/google-makes-easier-filter-image-search-results-usage-rights/>