The above image is published here under the following terms:

License

This image is in the public domain, either because it was placed there by its creator, because it is below the threshold of originality, or because its copyright term has expired.

Creator

Creative Commons

Source

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Rationale

Although this image is in the public domain, it is trademarked. It's use here, to identify Creative Commons licenses, is in compliance with the Creative Commons Trademark Policy.