This is a best practices document, its aims is to help implementors handling this technique and it may evolve over time.
The related section of the specification is TDM Metadata in HTML Content.
In html, metadata are defined using the repeatable and empty element, child of <head>. The meta element supports three main attributes: name, content and scheme (the http-equiv attribute is out of scope in our case).
This solution is only relevant for html (or xhtml) documents and does not apply to any other type of Web resource.
The protection offered by this solution only applies to the html (or xhtml) content: it does not apply to the Web resources referenced from such html content, e.g. images (via and <img> tag) or audiovisual content (via an <audio> <video> or <object> tag).
Meta elements can easily be integrated in html document at the time they are produced. No configuration is needed on the Web server which will serve these documents.
This solution cannot associate particular rights to different fragments of html content (this may be added to a future version of the specification).
html meta tags are found in the context of robots meta directiveshttps://github.com/w3c/tdm-reservation-protocol/blob/main/docs/robots.md#robots-meta-directives.
html meta tags are also found in the context of the Article Sharing Framework. Look especially at the NISO ALI Best practices in section 4.