The new search tool looks for websites with a Creative Commons license.
For example, photographers could choose to make their work available for free for noncommercial use only and with attribution. The nonprofit group also has licenses covering cases where parts of an artist's work are used by a third party in another project, which is then distributed to others. Creative Commons offers a total of 11 licenses.Yahoo claims to search millions of web pages with the Creative Commons license logo.
More information at InformationWeek