January 14, 2014
With this new update to Google Image Search, users now can search for images by licensing rights under the " search tools " which is in the front page. Before this update and in order for users to sort their search results, they had to access it through "Advanced search "which was not convenient enough as many people don't even bother with it.
This tidbit was shared by a tweet by Matt Cutts , Google spam engineer, and I learned about it from the Next Web.
Here is a snapshot of the location of "usage rights" in Google Image