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The problem with these sorts of methods, is that its simple enough for a wz library developer to adjust their library to work in spite of your change. WZ files are simply data files, and because MapleStory has to load them, they cannot be encrypted or packed in any way. Thus, while it may be possible to exploit bugs with certain wz libraries, you cannot effectively lock your wz files from being edited.It is possible to prevent editing of WZ files. There are various methods in doing so. Some ways are more "solid" than others, shall I say? Some people use tricks (or workarounds) by "exploiting" the saving of WZ files. Thus, causing the reading of WZ files to be unreadable. A good example of this would be at Koolk's Map Editor. In the past, it was originally 'uneditable', until Koolk Breaker came in. Another method would be a custom WZ encryption. Unfortunately, this is not public knowledge, and only a few select individuals in this community could get it working.
You are absolutely right about the effectively locking part. But, a custom WZ encryption is actually possible.
Technically, you could edit the client to support a custom WZ encryption, but at that point you might as well be working on NoLifeStory.If you were to encrypt the WZ files, you'd have to make the Maplestory client able to decrypt it. Therefore you cannot encrypt the WZ files if you'd like to use them for your server.