How to block access to WWW folder to steal the php code in a local application

I would like to know how to block access to user folder www undue do not copy the code from my system. He has run in local machine and application server.

If it is on a local machine, how someone can copy the code ?

this on a network with three machines without internet access. I need the code or block access to a competitor not to copy

I would like protect the folder WWW for someone copy the code, with pen drive, eg

use zend encoder or something equal.