Google recently (August 2009) announced in their Official Webmaster Central blog that they added to Google Image Search support for RDFa mark-up indicating the type of license for an image embedded in an HTML page (it applies only to the images owned by the site using the mark-up). The mark-up wraps around the image to make clear which license type for reuse refers to which image. The example given in the blog article is
<img src="image.jpg" />
<a rel="license" href="http://creativecommons.org/example">Creative Commons Attribution example</a>
The new micro-format attributes for labelling the type of usage rights for reuse are the
about attribute of the
div element enclosing the image and the hyperlink describing the type of license, and the
rel="license" attribute of the hyperlink.
The Google blog article contains this YouTube video presentation: