Protect server files (Client edit)

Assuming:
- I'm using V19 clean files
- I have a patcher

How I can prevent people from editing the client files and validate them?
e.g block invalid clients from accessing the server without the expected client files.

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Quote:

Originally Posted by Lindanus [Only registered and activated users can see links. Click Here To Register...]

Thanks! This is very useful and I've been through the list, but I can't find how to protect the client files from being edited.

There is NO guide for that !
You must learn c++, flyff code and learn how to crypt files.
Or you pay someone to code that for you ;)