diff --git a/util/update_copyrights b/util/update_copyrights
index aa7d676376..89300539d4 100644
--- a/util/update_copyrights
+++ b/util/update_copyrights
@@ -317,6 +317,25 @@ foreach $file (keys %file_types) {
                 while (/^<!DOCTYPE/ || /^<!ENTITY/ || /^<\?xml-stylesheet/ || /^<\?xml /) {
 			# print "SGML: $_";
 			$before_copyright = "$before_copyright$_";
+			if (/\]>$/ ) {
+				$_ = <SOURCE>;
+				close(SOURCE) if (eof(SOURCE));
+				next;
+			}
+			if (/^<!DOCTYPE/) {
+				while (!eof(SOURCE)) {
+					$_ = <SOURCE>;
+					next if (eof(SOURCE));
+					$before_copyright =
+						 "$before_copyright$_";
+					if (/]>$/) {
+						$_ = <SOURCE>;
+						last;
+					}
+				}
+				close(SOURCE) if (eof(SOURCE));
+				next;
+			}
 			if (/>$/ ) {
 				$_ = <SOURCE>;
 				close(SOURCE) if (eof(SOURCE));