How to secure Visual Foxpro code?

Want to secure program code? Wondering how to do so in Visual Foxpro? find suggestions from experts on this page.

I want to give security to my Visual Foxpro program(billing software). It has to be secured from others to avoid viewing my coding through password setup process.
Can you tell how to set password to my billing software(Visual Foxpro) to deny programming(view options)from others?
Can you also provide the coding to set password to my coding(inventory,sales, purchase modules).