fixes license and attribution issues

tools/update-authors.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-## 
+##
 ## This script will auto-generate the AUTHORS attribution file.
 ## If your name does not display correctly, then please
 ## update the .mailmap file in the root repo directory
@@ -25,7 +25,8 @@ END {
   print "# Authors ordered by first contribution.\n";
   print "# Generated by tools/update-authors.sh\n";
   print "\n", @authors;
+  print "\n*** = works in the public domain";
 
 }
 
-' > ../AUTHORS
+'