Best way to secure source code

I use wappler to extend a web application that’s hosted on my clients server.

They have a Windows Server with IIS and MS SQL Server.
My Wappler created pages are currently hosted on this same machine.

What is the easiest way to prevent the wwwroot folder of my site being copied and used elsewhere with a slight modification to the database connection parameters in dmxConnect\modules\Connections

Would just copying the .asp pages in dmxConnect\api and hosting on my own server and remove them from the customer machine, modify the paths work?

I would like to have the absolute minimum files on my customers office server.

Many thanks in advance