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Google made a significant change to the Image License search feature, and changed the name of the search feature to Image metadata. Previously it could only be used on licensable images; by specifying license information for the images on your website through structured data, the image can display with a 'Licensable' badge on image thumbnails in Google Images.
Now, image metadata can be added for any image, so the required property that was previously licenseis now 'either creator or creditText or copyrightNotice or license.'
A number of additional recommended properties have also been added to support this: