The purpose of this very simple mod is to resolve errors like "invalid signature for profile public key. try restarting your game" and for this purpose this mod disables the credentials check used by default on common Minecraft servers (servers not run through server.jar from those started by the multiplayer screen or the /publish command in minecraft with gui)
It should be equivalent to setting online-mode = false if playing in server.jar only for common games run with GUI.
Because disabling credential verification can be dangerous and is not recommended for large servers, it is just a way for friends who play on multiple launchers and have errors like "invalid signature for profile public key. try restarting your game" to have fun
