diff --git a/table/tables/memory_tables.go b/table/tables/memory_tables.go
index 9b540f1378..8a419baac9 100644
--- a/table/tables/memory_tables.go
+++ b/table/tables/memory_tables.go
@@ -1,8 +1,4 @@
-// Copyright 2013 The ql Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSES/QL-LICENSE file.
-
-// Copyright 2015 PingCAP, Inc.
+// Copyright 2016 PingCAP, Inc.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
diff --git a/util/auth.go b/util/auth.go
index 8531929656..7b6cf6baf5 100644
--- a/util/auth.go
+++ b/util/auth.go
@@ -1,7 +1,3 @@
-// Copyright 2013 The ql Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSES/QL-LICENSE file.
-
 // Copyright 2015 PingCAP, Inc.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/util/types/field_type.go b/util/types/field_type.go
index dfedb389cc..38da5f6280 100644
--- a/util/types/field_type.go
+++ b/util/types/field_type.go
@@ -1,7 +1,3 @@
-// Copyright 2014 The ql Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSES/QL-LICENSE file.
-
 // Copyright 2015 PingCAP, Inc.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");