Index: modules/book/book.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/book/book.module,v
retrieving revision 1.553
diff -u -p -r1.553 book.module
--- modules/book/book.module	24 Sep 2010 00:37:42 -0000	1.553
+++ modules/book/book.module	15 Oct 2010 17:12:35 -0000
@@ -264,6 +264,9 @@ function book_block_view($delta = '') {
         // Since we know we will only display a link to the top node, there
         // is no reason to run an additional menu tree query for each book.
         $book['in_active_trail'] = FALSE;
+        // Check whether user can access the book link.
+        $book_node = node_load($book['nid']);
+        $book['access']  = node_access('view', $book_node);
         $pseudo_tree[0]['link'] = $book;
         $book_menus[$book_id] = menu_tree_output($pseudo_tree);
       }