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You can download, share, and reuse millions of the Smithsonian’s images—right now, without asking. With new platforms and tools, you have easier access to nearly 3 million 2D and 3D digital items from our collections—with many more to come. This includes images and data from across the Smithsonian’s 19 museums, nine research centers, libraries, archives, and the National Zoo.
The Creative Commons website has a search engine that searches the Web for Creative Commons works, and Google (under its Advanced Search facility) has an option to search for materials that use Creative Commons. Select usage rights and from drop down menu: free to share or modify, even commercially.
The latest version of the Creative Commons (CC) licence is 4.0 so make sure that any images you are using from other sources have this version applied.
Always check which CC version is being applied and avoid using earlier versions where possible.
If this is not possible, please check that you comply exactly with all the terms and conditions assocaiated with this version as litigation is possible and fines can be large.