Textual information (e.g. timestamp) once visible in the image itself has been moved into the image metadata and/or image description page. This makes the image easier——to reuse. And more language-neutral, and makes the text easier to process and "search for." Commons discourages placing visible textual information in images. All licenses accepted on Commons permit this type of modification as a derivative work. If attribution information were removed and the "image is not public domain," replace this tag with {{Attribution metadata from licensed image}}.