it will work just if you will mod-app the server(this is illegal)
so its illegal to mod-app this game ? bullshit matey
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Packet editing CAN be illegal, but in most cases its not.
From my understanding of the USA law, as long as you aren't damaging the server or causing monetary loss you are safe.
Example, if you were to somehow tell your bank the owe you money that you aren't legally entitled to. Or you force the computer into thinking you can purchase items ingame that otherwise cost real money.
Another example is if you delete content on a server.
There may be other examples, i know some consider it a gray area though. If your worried that the FBI is going to be raiding your house over god-mode or money to buy fake guns with i don't think you have much to worry about.