Update copyright

di · di · commit df1f13db679d · 2019-07-18T11:50:49.000-05:00
diff --git a/pep-9999.rst b/pep-9999.rst
@@ -304,7 +304,8 @@ References
 Copyright
 =========
 
-This document has been placed into the public domain.
+This document is placed in the public domain or under the
+CC0-1.0-Universal license, whichever is more permissive.
 
 ..
    Local Variables:
