File Copy Protection

New e-learning development start up needs help with selecting and implementing a copy protection regime for one of its products. The product is an .exe file (from e-learning development product called Articulate) plus a number of integrated .swf and .pdf files. All this is in a self extracting zip file currently.

I need a low cost solution to avoid the file being copied easily on purchase - via some form of key protection software. Open to other suggestions of protection. Simple password solution is too trivial.

Scope of work (1) Recommend/Select software, (2) Implement and test the protection of the first product for me (3) Teach me how to use the software.