Obsfuscate it, and bring it in
If I'll manage to decompile - it's MINE!!!
Just a joke, of course. I think the most valuable part of the project is the design, and you can't hide it with obfiscation. How about recent certified? They may have still some interest? Or even better - people, who are waiting for the essay exam to take. They are still in the right mood, and they can't use your code, since they have already submitted.