how do I prevent theft of intellectual property?

Scenario: Laptop behind a whitelisted Sonicwall hardware firewall. Connections are to two outfits, one is a broker, the other is a data provider. I have a script that is written in C++ and compiled with the Open Watcom C++ Compiler. I'm wondering if there is a way to prevent uploads of my script? Maybe the compiled version could be uploaded while it was running and the thief could reverse engineer it? I can keep the text versions of the script off the computer, keep them on a flash drive and remove it after compilation and before connecting to the internet for example but the .dll has to be there in some way shape or form in order for the script to run... can files be blocked by their type? I don't think that all the software will run in a user account, some of it has to have some administrator privileges.. I've been told that's not the best case for security but there is little I can do about that... do they still have superuser accounts or some way to limit the access that Admin privileges provide?