materio-base-d7/materio_title_access.module

<?php

/**
 * Implements hook_permission().
 */
function materio_title_access_permission() {
	$perms = array();
	$entity_infos = entity_get_info();
	foreach ($entity_infos['node']['bundles'] as $bundle => $value) {
  	$perms['show '.$bundle.' title'] = array(
  		'title' => t('Show !bundle node title.', array('!bundle'=>$value['label'])),
  	);
  }
	return $perms;
}


/**
 * Implements hook_field_access().
 */
function materio_title_access_field_access($op, $field, $entity_type, $entity, $account) {
  if($field['field_name'] == 'title_field' && $entity_type == 'node' && isset($entity->type)){
  	return user_access('show '.$entity->type.' title');
  }
  return TRUE;
}

function materio_title_access_preprocess_html(&$vars){

  if (arg(0) == 'node' && $node = node_load(arg(1))) {

    if(!user_access('show '.$node->type.' title')){
      if($node->type == "materiau"){
        $title = field_get_items('node', $node, 'field_nature_titre');
        $vars['head_title_array']['title'] = $title[0]['safe_value'];
      }else{
        $vars['head_title_array']['title'] = 'restricted access';
      }

      $vars['head_title'] = implode(' | ', $vars['head_title_array']);
    }
  }
}