diff --git a/main.go b/main.go
index 70954ee..449a079 100644
--- a/main.go
+++ b/main.go
@@ -1,9 +1,3 @@
-/* Copyright (c) 2018, joy.zhou <chowyu08@gmail.com>
-
-Permission to use, copy, modify, and/or distribute this software for any
-purpose with or without fee is hereby granted, provided that the above
-copyright notice and this permission notice appear in all copies.
-*/
 package main
 
 import (