Index: wp-includes/post-template.php
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- wp-includes/post-template.php	(revision 28690)
+++ wp-includes/post-template.php	(revision )
@@ -427,6 +427,10 @@
 			$classes[] = 'format-standard';
 	}
 
+	// Post is protected
+	if ( !empty($post->post_password) )
+		$classes[] = 'protected';
+
 	// Post requires password
 	if ( post_password_required( $post->ID ) ) {
 		$classes[] = 'post-password-required';