Licensed Key on Test Server

Hello, is there a way to use a licensed version of ckfinder on the testing server without it saying this is a demo version? We are building a custom cms for a client and want them to be able to see all functionality of it before going live and it does not look good when it says this is a demo version. We have the key and all but it is for the domain name and this is being built on a test server which is not part of the domain name. Please let me know. Thank you for your time.

Rob