Google Images has an option to filter images based on license.
Each image on my site has a details page, where I have the following link to denote the license:
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/deed.en_US" target="_blank">CC-BY</a>
It's a modified version of the sample code from Creative Commons - Choose a License.
However, I see images that Google has indexed since I added this code do not appear when I select a license filter.
For any of the license types, you can learn how to acquire a license for the image by clicking on the license details link provided. These updates are part of changes we have made on Google Images in recent years to make it more clear who the creator or copyright holder of the image is.
Type in a keyword to search for at the top and click the "Google Search" button. Select an image to use. Before reusing content that you've found, verify that its license is legitimate and check the exact terms of reuse stated in the license. For example, most licenses require that you give credit to the image creator when reusing an image.
Google filters images by license based on information provided by the sites that host those images, or the image provider. Always confirm an image's license information. You can follow the "License details" link and review it for accuracy with both the license's provider and the image's host site.
Now, Google will display a “Licensable” badge on image thumbnails in Google Images search results if that image has a usage license associated with it. This not only raises awareness of the value of an image (no, they are not all free), but it also provides a link directly to your website where a license can be purchased for its use.
You need to wrap it around a div with an about attribute. Here's an example that Google provides:
<div about="image.jpg">
<img src="image.jpg" alt="" />
<a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/">Creative Commons Attribution Share-Alike 3.0</a>
</div>
So in your case:
<div about="image.jpg">
<img src="image.jpg" alt="" />
<a rel="license" href="http://creativecommons.org/licenses/by/4.0/deed.en_US" target="_blank">CC-BY</a>
</div>
Sources: https://www.youtube.com/watch?v=quyhasVn2jw, http://googlesystem.blogspot.com/2009/08/simple-way-to-specify-image-licenses.html
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