Is used to to define the uri to the license, under which a website is published. This can either be your own license, which you've uploaded on a server, or an official source, such as the CreativeCommons-website.
Please note: Only use
license:uri if the license you are willing to use is not already listed as a
<meta name="license:uri" content="https://creativecommons.org/licenses/by-nc-sa/4.0/">
License URIs for
content may be:
In the WHATWG WikiUp to date: v2.3.3