Usage rights tell the user what they can and cannot legally do with images that they wish to reuse.
A Brief Summary of Types of Usage Rights (from Google Support)
Find more information on this topic at:
For a quick guide and explanation of where to find media for classroom projects, visit the list made by Richard Byrne, of Free Technology for Teachers site and newsletter, available as a Google Doc or as a PDF (via Box).
Use Creative Commons to look for images that have licenses that fit your use, or to see if you can locate the license for a particular image that you have.
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