How to use two servers to host an application ?

[eluser]Unknown[/eluser]
We are developing an app which will be hosted on customer's local intranet server (along with their data) and it will access our internet server too. Now we do not want customer's IT people to have access to our code on their servers. We somehow need to protect the code we have developed. How do I go about doing this or this approach of having two servers is totally wrong. Some body please suggest a way.

Regards!

Ryn

Obviously we are using CI.