There are ways of controlling permitted calling programs and you can go a long way protecting that against unsuspecting developers, but I think we need to understand here why this program should not be able to be debugged in a development system.
What is really the goal which Ram is trying to achieve here? Protect some secret algorithm from being displayed? Prevent the program from executing? Prevent the program from being changed? Protect the program completely against the ABAP editor tools?
It might even be best to take this code out of the ABAP environment and rather start it as an external program - like SAP does with C-functions or TCP/IP destinations.
Cheers,
Julius