Merge pull request #6568 from pulibrary/public-domain-mark

Adding Creative Commons Public Domain Mark rights statement

config/authorities/rights_statement.yml

@@ -236,3 +236,14 @@
 
       You can copy, modify, distribute and perform the work, even for commercial
       purposes, all without asking permission.
+  - :value: https://creativecommons.org/publicdomain/mark/1.0/
+    :label: Public Domain Mark
+    :notable: true
+    :scopeNote: |
+      No Copyright
+    :definition: >-
+      This work has been identified as being free of known restrictions under copyright law,
+      including all related and neighboring rights.
+
+      You can copy, modify, distribute and perform the work, even for commercial purposes, all
+      without asking permission.