hide comment for the CCK field according to user's permissions.

If we want that only show in the comments the changes y driven comments of cck according to user's permissio, I change comment_driven.module file :
In fucntion comment_driven_preprocess_comment(&$vars) near line 389 :

function comment_driven_preprocess_comment(&$vars) {
  $comment = $vars['comment'];
  $node_type = node_get_types('type', node_load($comment->nid))->type;
	$log = comment_driven_load_log($comment->cid);

	if (!$log) return;
      // Description : Revision of 11/03/2011 hide comment for the CCK field
     // according  to user's permissions.
    /****************/
   /* BEGIN CHANGE */
  /****************/
  
	$key_diff_render=0;
	foreach ($log->changes as $key_changes => $value){
		$field = explode(":",$key_changes);
		$type_field = $field[0];
		$name_field = $field[1];
		if(!user_access('view '.$name_field) && $type_field == 'cck')
			{
			unset($log->changes[$key_changes]);
			unset($log->diff_render[$key_diff_render]);
			}
		$key_diff_render++;
		}
    
    /****************/
   /* END CHANGE */
  /****************/
  $live_render = (!$log->frozen && comment_driven_is_live_render($node_type));