diff --git a/LICENSE b/LICENSE
index 6807d52..6730290 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,5 +1,4 @@
-Copyright (c) 2020, JoungKyun.Kim
-All rights reserved.
+Copyright 2021. JoungKyun.Kim all rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
diff --git a/filebin.c b/filebin.c
index 617712b..4336f77 100644
--- a/filebin.c
+++ b/filebin.c
@@ -3,8 +3,7 @@
  *
  * JoungKyun.Kim, <http://oops.org>
  *
- * Copyright (c) 2020, JoungKyun.Kim
- * All rights reserved.
+ * Copyright 2021. JoungKyun.Kim all rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
diff --git a/php_filebin.h b/php_filebin.h
index 42d943f..31dd47f 100644
--- a/php_filebin.h
+++ b/php_filebin.h
@@ -5,8 +5,7 @@
  *
  * JoungKyun.Kim, <http://0ops.org>
  * 
- * Copyright (c) 2020, JoungKyun.Kim
- * All rights reserved.
+ * Copyright 2021. JoungKyun.Kim all rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions