Using Zend Guard Loader
You can use Zend Guard Loader, a free application, to decode your website's Zend files if you use PHP 5.3 or later on your Linux hosting account. For more information, see View or change your PHP version.
Note: If you use any version of PHP prior to 5.3 (for example, 5.2), you must use Zend Optimizer to decode your Zend files. For more information, see Using Zend Optimizer.
To enable Zend Guard Loader, you must either modify or create a PHP initialization file (more info) that includes the following code at the beginning:
apc.enabled=0 disables APC, which you must do to you Zend Guard on our hosting accounts.