There are two ways that you can download submissions:
You can do this one by one by clicking on the file name
Or to download all at the same time, at the top under Grading action, choose Download all submissions.
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If you require any advice on Copyright law please contact your Librarian or refer to the Library Copyright for staff and students Moodle page
However, if you are looking for an image or other media for Moodle or your PowerPoints etc, there are a number of places that are under the Creative...