我正在注册自定义帖子类型，如：

/* POST TYPE: SECRET CARDS */
function register_post_type_secret_cards()
    {
        $args = array(
            \'labels\' => array(
                \'name\' => \'Secret Cards\',
                \'singular_name\' => \'Secret Card\',
                \'add_new\' => \'Add New Item\',
                \'add_new_item\' => \'Add New Item\',
                \'edit_item\' => \'Edit Item\',
                \'new_item\' => \'Add New Item\',
                \'view_item\' => \'View Items\',
                \'search_items\' => \'Search Items\',
                \'not_found\' => \'No Item Found\',
                \'not_found_in_trash\' => \'No Items Found in Trash\'
            ),
            \'query_var\' => \'secret_cards\',
            \'rewrite\' => array(
                \'slug\' => \'secret-cards/\',
            ),
            \'public\' => true,
            \'menu_position\' => 4,
            \'supports\' => array(
                \'title\',
            )
        );

        register_post_type(\'secret_cards\', $args);

    }
add_action( \'init\', \'register_post_type_secret_cards\' );

这些卡可以从前端访问，如：

http://myweb.com/secret-cards/john-wayne

但我不想让人们从前端访问这些IK。它应该只能在admin中访问。

如何做到这一点？