There actually is a microformat specification for this, rel="license" [1], which you can use like this: <!-- In the footer --> [...] <a rel="license" href=

There actually is a microformat specification for this, rel="license" [1], which you can use like this: <!-- In the footer --> [...] <a rel="license" href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a> [...] Alternatively, as the microformats page also points out, you could use `<meta>` or `<link>` tags [2] with a well-known ontology like Dublin Core [3]: <!-- In the head --> <link rel="DCTERMS.license" href="https://creativecommons.org/licenses/by-sa/4.0/" /> Which I'm fairly sure would be recognized and correctly extracted by scrapers like Zotero's. [1] http://microformats.org/wiki/rel-license http://microformats.org/wiki/rel-license [2] http://www.dublincore.org/specifications/dublin-core/dcq-html/ http://www.dublincore.org/specifications/dublin-core/dcq-htm... [2] http://purl.org/dc/terms/ http://purl.org/dc/terms/