Encrypt the software.
Copy it to your DVD together with identifying information on you as the author of the software.
Mail it to yourself as a registered article.
DO NOT OPEN. Keep it in a safe,dry place. The most important thing is the date stamp. It is admissible in court if a dispute arises.
Call the local WIPO office. Zimbabwe is a member. By the way, the Computer Society can be involved in issues pertaining to theft of software. A person can actually be arrested. I have seen one or two issues where some clever punks stole code and resold it as their own, only to be trapped later and faced threat of arrest.
But make sure you dont use GPL'd or publicly licensed code or libraries, because we will take your @$$ down