有谁见过这种源码加密方式，进来帮帮忙

分两个文件webset.php duo_ws.php
其中webset.php

复制代码 <?PHP $codelock_enc="duo_ws.php"; $codelock_file="webset.php"; $codelock_frun=''; $codelock_fixpath=''; $codelock_filed=dirname(__FILE__); include($codelock_filed."/duo_ws.php"); return; ?> PD9waHAgDQpl$nJv$l9yZXBv$n)pbm$oMCk7DQppbmNsdW)lICIuLi9jb(1tL(Nvbm4u$GhwIjsNCmluY(x1ZGUgIi4uL(NvbW0vY(9uZmlnLnBo$CI7DQppbmNsdW)lICJjaGVjay5waHAiOw0KJGNoZWNrY(9kZT1maWxlX(dldF9jb(50ZW50$yggYmFzZTY0X()lY(9kZSgiYUhSMGNEb3ZMM(QzZHk1a()XOWtkVzh4TWpNdVkyOX)MM0JoZVM5dWFXTnJMbkJvY0Q5dWFXTnJQUT09IikuTVlVU0VSTklDSy4iIiApOw0KaWYoJGNoZWNrY(9kZT09IjAiIG9yIC)jaGVja(NvZGU9PSIxIikNCnsNCglpZiAoIHN0$nBv$....

duo_ws.php

复制代码  <?PHP $codelock_rfiled=dirname(__FILE__); if ($codelock_file == '') { echo "<font face='verdana' size='2'><br><b>Error!</b> You cannot run codelock directly...</font>"; die(); } else {} $codelock_lock="ICRjb2RlbG9ja19hY3RpdmVfa2V5PSJzZGZzZnNmZjEyMzJhYWFkZmcxMzIzMzIzMSI7IEBleHRyYWN0KCRfUkVRVUVTVCk7IGVycm9yX3JlcG9ydGluZyhFX0FMTCBeIEVfTk9USUNFKTsgaWYgKCRjb2RlbG9ja19hY3QgPj0gMSkgeyB9IGVsc2UgeyBAc2..."; eval(base64_decode($codelock_lock)); return; ?> JGNvZGVsb(NrX(V4$D0iTWpBeE1UQTVNamdxIjsgJGNvZGVsb(NrX(V4$GlyeV9tZXNzYWdlPSJW)(hwY3lCamIyUmxJ)(x6SUhCeWIzUmxZM1J......

代码太长了,一些地方省略,详细请看附件
$codelock_lock 用的是base64编码，里面的内容已经可以看到，但是<?php  ...  ?>外的那些加密的是什么东西，我现在还没找到好的解决办法。。。

找了个类似的样例，也是两个文件加密，解密出来放一个文件中，但是还是没弄明白，传上来大家一起研究研究吧