Plenty of script-driven applications, especially paid content management systems, encode their files in order to ensure that they will not be reverse engineered or tampered with. The majority of them use an application known as ionCube PHP Encoder to do that, so, in case you purchase a paid script and you'd like to set it up in a website hosting account, a tool known as ionCube Loader has to be present on the server. Without having it, you can't install the script or in case you somehow find a way to do this, it will not operate effectively for the reason that most of the script code will be encrypted to a point where it can't be interpreted. That's why, you need to ensure that ionCube Loader is present when you get a fresh website hosting account and you'd like to use some paid web application. If you acquire a shared website hosting account and the instrument is not present, it can't be added as the whole server PHP environment shall have to be compiled again.