if you need to code something ,and , you want to prevent your code from being visible and prevent needless cluttering , I suggest that you write a dll (plugin) , if you have a pro licence or a plugin licence ,in such cases you may redistribute the build dll and simply keep your source code private ,if you don't have any of these licences you may redistribute your dll but you must provide the source code along with it.

hence the only part of viewable code wil be function declarations and definitions in a .c/.h file to be included in a user's project ,along with the dll wich the engine will automatically load up .