entries[i].license
A URL of the license under which this entry is distributed.
If this is a relative URI, it is resolved according to a set of rules.
Comes from
/atom10:feed/atom10:entry/atom10:link[@rel=”license”]/@href
/rdf:RDF/rdf:item/cc:license/@rdf:resource
/rss/channel/item/creativeCommons:license