请高手帮我将下列PHP代码解一下密并告知方法！非常感谢！

mmmmmm5

<?php
/*********************/
/*                   */
/*  Version : 5.1.0  */
/*  Author  : RM     */
/*  Comment : 071223 */
/*                   */
/*********************/

$_license_info_ = "YToxMzp7czo4OiJ1c2VybmFtZSI7czo0OiK/4L/gIjtzOjI6Im5vIjtzOjE0OiIyMDA5MDQyNTEwMDM0NyI7czoyOiJzbiI7czoxOToiRlJFRS1URlhRLUI3Vk4tRDYzTCI7czoxMjoibGljZW5zZV90eXBlIjtzOjc6Ik5FVFdPUksiO3M6MTI6ImxpY2Vuc2VfbmFtZSI7czo2OiK+1tPyzfgiO3M6NjoibnVtYmVyIjtzOjE6IjIiO3M6MTM6ImFjYm9va19udW1iZXIiO3M6MToiMSI7czoxMjoibGljZW5zZV9kYXRlIjtzOjEwOiIxMjQwNjY4MzE0IjtzOjc6ImNvbXBhbnkiO3M6MzQ6Isu8wvXK27rzt/7O8c6s0N653MDtz7XNs6OovqvTorDmo6kiO3M6NzoiYWRkcmVzcyI7czowOiIiO3M6MTE6ImRlZmluZV9tZXRhIjtzOjQ6InRydWUiO3M6NjoiZXh0ZW5kIjtzOjA6IiI7czo3OiJwbHVnaW5zIjtzOjA6IiI7fQ==";
$_license_md5_ = "2JF1kGmlrni4ort9so2FeoespteF0JmNupppdn6hs7OuqnvYgqahqLF7rmizi3SqfeCyloCrany8d5yBhaLY2djalLVt1Wllr3rcr7OhhKp+0LqXgeB6ZrJ+rWmnrb2xlJ2k26mRbYCbmpuqloVpaGOzpdeunY2E2WeHoKao27rR2HbOpJihpLCg3K8=";
?>

主要是需要解的是第二行$_license_md5_=内容，并请告知是用何方法解开，非常感谢！