diff --git a/dtmsvr/trans_class.go b/dtmsvr/trans_class.go
index be60ac8..5023e06 100644
--- a/dtmsvr/trans_class.go
+++ b/dtmsvr/trans_class.go
@@ -1,9 +1,3 @@
-/*
- * Copyright (c) 2021 yedf. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
 package dtmsvr
 
 import (
diff --git a/dtmsvr/trans_process.go b/dtmsvr/trans_process.go
index 7a8fe46..e8ffd96 100644
--- a/dtmsvr/trans_process.go
+++ b/dtmsvr/trans_process.go
@@ -1,9 +1,3 @@
-/*
- * Copyright (c) 2021 yedf. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
 package dtmsvr
 
 import (
diff --git a/dtmsvr/trans_status.go b/dtmsvr/trans_status.go
index 3e8495e..67552db 100644
--- a/dtmsvr/trans_status.go
+++ b/dtmsvr/trans_status.go
@@ -1,9 +1,3 @@
-/*
- * Copyright (c) 2021 yedf. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
 package dtmsvr
 
 import (
diff --git a/dtmsvr/trans_type_msg.go b/dtmsvr/trans_type_msg.go
index da3c80e..49816e5 100644
--- a/dtmsvr/trans_type_msg.go
+++ b/dtmsvr/trans_type_msg.go
@@ -1,9 +1,3 @@
-/*
- * Copyright (c) 2021 yedf. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
 package dtmsvr
 
 import (
diff --git a/dtmsvr/trans_type_saga.go b/dtmsvr/trans_type_saga.go
index a285e63..2e3ddab 100644
--- a/dtmsvr/trans_type_saga.go
+++ b/dtmsvr/trans_type_saga.go
@@ -1,9 +1,3 @@
-/*
- * Copyright (c) 2021 yedf. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
 package dtmsvr
 
 import (
diff --git a/dtmsvr/trans_type_tcc.go b/dtmsvr/trans_type_tcc.go
index 5898d97..5146226 100644
--- a/dtmsvr/trans_type_tcc.go
+++ b/dtmsvr/trans_type_tcc.go
@@ -1,9 +1,3 @@
-/*
- * Copyright (c) 2021 yedf. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
 package dtmsvr
 
 import (
diff --git a/dtmsvr/trans_type_xa.go b/dtmsvr/trans_type_xa.go
index 173b9ed..d4ca3b3 100644
--- a/dtmsvr/trans_type_xa.go
+++ b/dtmsvr/trans_type_xa.go
@@ -1,9 +1,3 @@
-/*
- * Copyright (c) 2021 yedf. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
 package dtmsvr
 
 import (