Copyright.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace Magento\Backend\Block\Page;

/**
 * Copyright footer block
 *
 * @api
 * @since 100.0.2
 */
class Copyright extends \Magento\Backend\Block\Template
{
    /**
     * Path to template file in theme
     *
     * @var string
     */
    protected $_template = 'Magento_Backend::page/copyright.phtml';
}