diff --git a/examples/wenetspeech/asr1/local/extract_meta.py b/examples/wenetspeech/asr1/local/extract_meta.py
index 0e1b27278..2cad977be 100644
--- a/examples/wenetspeech/asr1/local/extract_meta.py
+++ b/examples/wenetspeech/asr1/local/extract_meta.py
@@ -1,18 +1,7 @@
-# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
 # Copyright 2021  Xiaomi Corporation (Author: Yongqing Wang)
 #                 Mobvoi Inc(Author: Di Wu, Binbin Zhang)
+# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
+#
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
@@ -24,6 +13,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
 import argparse
 import json
 import os
diff --git a/paddlespeech/kws/exps/mdtc/compute_det.py b/paddlespeech/kws/exps/mdtc/compute_det.py
index e43a953db..853056966 100644
--- a/paddlespeech/kws/exps/mdtc/compute_det.py
+++ b/paddlespeech/kws/exps/mdtc/compute_det.py
@@ -1,3 +1,5 @@
+# Copyright (c) 2021 Binbin Zhang(binbzha@qq.com)
+#               2022 Shaoqing Yu(954793264@qq.com)
 # Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/paddlespeech/kws/exps/mdtc/plot_det_curve.py b/paddlespeech/kws/exps/mdtc/plot_det_curve.py
index a3ea21eff..4960281ee 100644
--- a/paddlespeech/kws/exps/mdtc/plot_det_curve.py
+++ b/paddlespeech/kws/exps/mdtc/plot_det_curve.py
@@ -1,3 +1,5 @@
+# Copyright (c) 2021 Binbin Zhang(binbzha@qq.com)
+#                    Menglong Xu
 # Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/paddlespeech/kws/exps/mdtc/score.py b/paddlespeech/kws/exps/mdtc/score.py
index 1b5e1e296..556455ca1 100644
--- a/paddlespeech/kws/exps/mdtc/score.py
+++ b/paddlespeech/kws/exps/mdtc/score.py
@@ -1,4 +1,6 @@
-# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
+# Copyright (c) 2021 Binbin Zhang(binbzha@qq.com)
+#               2022 Shaoqing Yu(954793264@qq.com)
+#               2022 PaddlePaddle Authors. All Rights Reserved.
 #
 # 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/paddlespeech/kws/models/loss.py b/paddlespeech/kws/models/loss.py
index 64c9a32c9..bda77f2ba 100644
--- a/paddlespeech/kws/models/loss.py
+++ b/paddlespeech/kws/models/loss.py
@@ -1,3 +1,4 @@
+# Copyright (c) 2021 Binbin Zhang
 # Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/paddlespeech/kws/models/mdtc.py b/paddlespeech/kws/models/mdtc.py
index 5d2e5de64..c605a02b6 100644
--- a/paddlespeech/kws/models/mdtc.py
+++ b/paddlespeech/kws/models/mdtc.py
@@ -1,3 +1,4 @@
+# Copyright (c) 2021 Jingyong Hou (houjingyong@gmail.com)
 # Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/paddlespeech/s2t/io/dataset.py b/paddlespeech/s2t/io/dataset.py
index 0e94f047b..9987b5110 100644
--- a/paddlespeech/s2t/io/dataset.py
+++ b/paddlespeech/s2t/io/dataset.py
@@ -1,4 +1,5 @@
 # Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
+# Copyright 2021 Mobvoi Inc. All Rights Reserved.
 #
 # 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/paddlespeech/s2t/models/u2/u2.py b/paddlespeech/s2t/models/u2/u2.py
index d5471369f..b4b61666f 100644
--- a/paddlespeech/s2t/models/u2/u2.py
+++ b/paddlespeech/s2t/models/u2/u2.py
@@ -1,3 +1,4 @@
+# Copyright 2021 Mobvoi Inc. All Rights Reserved.
 # Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/paddlespeech/s2t/models/u2/updater.py b/paddlespeech/s2t/models/u2/updater.py
index c59090a84..898a50bf0 100644
--- a/paddlespeech/s2t/models/u2/updater.py
+++ b/paddlespeech/s2t/models/u2/updater.py
@@ -11,7 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-# Modified from wenet(https://github.com/wenet-e2e/wenet)
+
 from contextlib import nullcontext
 
 import paddle
diff --git a/paddlespeech/s2t/utils/ctc_utils.py b/paddlespeech/s2t/utils/ctc_utils.py
index 886b72033..42564d8e1 100644
--- a/paddlespeech/s2t/utils/ctc_utils.py
+++ b/paddlespeech/s2t/utils/ctc_utils.py
@@ -1,3 +1,4 @@
+# Copyright 2021 Mobvoi Inc. All Rights Reserved.
 # Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/paddlespeech/s2t/utils/text_grid.py b/paddlespeech/s2t/utils/text_grid.py
index cbd9856e4..e696f43d5 100644
--- a/paddlespeech/s2t/utils/text_grid.py
+++ b/paddlespeech/s2t/utils/text_grid.py
@@ -1,3 +1,4 @@
+# Copyright 2021 Mobvoi Inc. All Rights Reserved.
 # Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
diff --git a/speechx/examples/CMakeLists.txt b/speechx/examples/CMakeLists.txt
index 3c274a20a..bcb23eddb 100644
--- a/speechx/examples/CMakeLists.txt
+++ b/speechx/examples/CMakeLists.txt
@@ -1,4 +1,3 @@
 cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
 
 add_subdirectory(ds2_ol)
-add_subdirectory(dev)
\ No newline at end of file
diff --git a/utils/compute-wer.py b/utils/compute-wer.py
index 978a80c9f..98bb24a7e 100755
--- a/utils/compute-wer.py
+++ b/utils/compute-wer.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
-# CopyRight WeNet Apache-2.0 License
+# Copyright 2021 Mobvoi Inc. All Rights Reserved.
 import codecs
 import re
 import sys