[Zope] Final application distribution policies

[Ausum]

How do you do when you finish an application that will run on your
clients' server, and you don't want them to modify the source code, due
your need to reduce future failure risks, not imputable to you or your
code?

I know that with respect to Zope's license, binary distribuitons are
allowed, so how would you protect/close a finished application? 

What would your primary concerns be and what security policies would you
use?


Thanks in advance,



Ausum