Display text according to the access to a field
You can use drupal_set_message in hook_node_view to display the text as a message to the users.

function MODULE_NAME_node_view($node, $view_mode, $langcode) {
  if ($node-&gt;type == 'your_node_type') {
    if (!field_access('view', field_info_field('field_name'),'node', $node)) {
      drupal_set_message(t('Your text.'), 'warning');
    }
  }
}