The IonCube Loader PHP module decodes and executes protected PHP extensions, and is required for many commercial Magento extensions to function. This PHP module is already enabled by default on all M.D.G. IT shared hosting and VPS services with WHM / cPanel installed.
If you require the IonCube Loader installed and configured on your non-cPanel VPS service, please open a support ticket from the Client Area with your installation request. For further information on the IonCube Loader PHP module, please see: http://www.ioncube.com/loaders.php