Is any sort of &quot;Public Domain Mark&quot; required when using public domain content?
<p>Say I wanted to use a painting from the public domain for a book cover. Is it necessary to apply any sort of &quot;public domain mark&quot;?  If so, does it need to appear in a particular place (e.g., the cover itself vs. a copyright page)?</p>
<p>The reason I'm attempting to do so is because commons.wikimedia.org has stated that one 'must also include a United States public domain tag to indicate why this work is in the public domain in the United States.'</p>

<p>If a work is in the public domain, then there are no particular requirements on its use; in particular, it can be used on a book cover without a copyright notice, a public domain notice, or any other kind of notice or mark.</p>
<p><a href="https://commons.wikimedia.org/w/index.php?title=Template:PD-Art&amp;oldid=358286489" rel="nofollow noreferrer">Wikimedia Commons' public domain template</a> says, &quot;You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.&quot; This is a notice to users of Wikimedia Commons, informing them that if they upload a public domain image <em>to Wikimedia Commons</em>, they must include a public domain tag. That's a policy of Wikimedia Commons. It doesn't apply to people using the image outside of Wikimedia.</p>

public-domain