how to secure perl modules?

i have a collection of perl modules (running under the mod_perl umbrella)
and would like to distribute the application to several different sources
(clients with open internet web servers).  but i dont want to send it out
without at least making it somewhat difficult for some hacker to just simply
steal it and load it somewhere else without my consent.  what options do i
have (if any) to secure the code so that it can't be 'easily' stolen?
'easily' being the operative word here, as i realize it wont be 100% safe no
matter what i do.
the ideal would be to perhaps encrypt some of the code, maybe a few of the
base configuration modules, maybe even the startup.pl file, others?

any suggestions would be appreciated,
thanks