clipped from: www.marketingvox.com Google has added a Creative Commons filtering capability to its Image Search results, enabling users to query for images specifically labeled for "reuse," "commercial reuse," "reuse with modification" or "commercial reuse with modification."
Ideally, the feature shall enable a broader array of commercially-usable images to users that don't want to pay a stock photo company for imagery, and don't want to deal with the copyright headaches associated with "stealing" an unlicensed picture from Image Search.
The option isn't currently available on the user interface, but you can enable the pilter by adding a certain parameter to your search URL (in this case, just replace "mountains" with whatever you are actually searching for):