diff --git a/cipher.go b/cipher.go
index 12d38a5..afa338b 100644
--- a/cipher.go
+++ b/cipher.go
@@ -1,3 +1,7 @@
+// Copyright 2015 The Xorm Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package xorm
 
 type Cipher interface {
diff --git a/databook.go b/databook.go
index 5b7e0fa..e6a2a5e 100644
--- a/databook.go
+++ b/databook.go
@@ -1,3 +1,7 @@
+// Copyright 2015 The Xorm Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package xorm
 
 import (
diff --git a/dataset.go b/dataset.go
index 3903071..cc8cd63 100644
--- a/dataset.go
+++ b/dataset.go
@@ -1,3 +1,7 @@
+// Copyright 2015 The Xorm Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package xorm
 
 import (
diff --git a/des.go b/des.go
index df5bdef..7df6bb6 100644
--- a/des.go
+++ b/des.go
@@ -1,3 +1,7 @@
+// Copyright 2015 The Xorm Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package xorm
 
 import (