Use site.Copyright in footer and not custom params.

README.md

@@ -261,9 +261,6 @@ params:
                             # generate the `BreadcrumbListing`.
   cookieConsent: true       # Show cookie consent form, default false.
   contact: "info@example.org"
-  copyright: "This site is licensed under a 
-              [Creative Commons Attribution-ShareAlike 4.0 International
-              License](https://creativecommons.org/licenses/by-sa/4.0/)."
   dateformat: ""            # Set the date format, default to "2 January, 2006"
   description: ""           # Set site description, used in meta tags and JSON-LD
   favicon: ""               # Relative path to favicon in json feed, no leading slash.

layouts/_default/baseof.html

@@ -46,7 +46,7 @@
 {{ partial "footer.html" . }}
 {{ else -}}
 {{ if $.Param "feedlinks" }}{{ partial "feedlinks.html" . }}{{ end -}}
-<p>{{ with $.Param "copyright" }}{{ . | markdownify }}{{ else }}<span>© {{ site.Title }}</span>{{ end }}</p>
+<p>{{ with site.Copyright }}{{ . | markdownify }}{{ else }}<span>© {{ site.Title }}</span>{{ end }}</p>
 {{ with $.Param "footer" }}<p>{{ . | markdownify }}</p>{{ end }}
 {{ if $.Param "poweredby" }}<p>Powered by <a href="https://gohugo.io/">Hugo</a> and the <a href="https://github.com/frjo/hugo-theme-zen">Zen theme</a>.</p>{{ end }}
 {{ end -}}