Online Checker

CCStamp is also a Creative Commons Stamp checker. Since CCStamp is based on EXIF metadata embedded in images, all EXIF viewers can also be convenient checking tools. There are a lot of example, e.g. Flickr's EXIF info viewer and EXIF viewer add-on for Firefox (https://addons.mozilla.org/en-US/firefox/addon/exif-viewer/).

For Flickr, you can upload a photo containing Creative Commons Stamp to your account. You can go to photo page, select "Action" and then "View Exif Info". Creative Commons License description is shown in that page.

Please take a look at this link: http://www.flickr.com/photos/64595136@N06/5881130494/meta/in/photostream/.