diff --git a/cert/key.go b/cert/key.go
index 8a84c2a5..283c50f9 100644
--- a/cert/key.go
+++ b/cert/key.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package cert
 
 import (
diff --git a/cert/pem.go b/cert/pem.go
index a7666203..fa5e5172 100644
--- a/cert/pem.go
+++ b/cert/pem.go
@@ -1,18 +1,16 @@
-/*
-Copyright 2018 Jim Zhang (jim.zoumo@gmail.com). 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 2023 jim.zoumo@gmail.com
+//
+// 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.
 
 package cert
 
diff --git a/cert/pem_test.go b/cert/pem_test.go
index 675f7697..28799ebc 100644
--- a/cert/pem_test.go
+++ b/cert/pem_test.go
@@ -1,18 +1,16 @@
-/*
-Copyright 2018 Jim Zhang (jim.zoumo@gmail.com). 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 2023 jim.zoumo@gmail.com
+//
+// 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.
 
 package cert
 
diff --git a/cert/tls.go b/cert/tls.go
index 6103891a..a3f52b7d 100644
--- a/cert/tls.go
+++ b/cert/tls.go
@@ -1,18 +1,16 @@
-/*
-Copyright 2018 Jim Zhang (jim.zoumo@gmail.com). 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 2023 jim.zoumo@gmail.com
+//
+// 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.
 
 package cert
 
diff --git a/cert/types.go b/cert/types.go
index 505f83cc..a1a1422e 100644
--- a/cert/types.go
+++ b/cert/types.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package cert
 
 import (
diff --git a/cli/injection/inject.go b/cli/injection/inject.go
index 6544d97e..90ef4cca 100644
--- a/cli/injection/inject.go
+++ b/cli/injection/inject.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package injection
 
 import (
diff --git a/cli/injection/mixin.go b/cli/injection/mixin.go
index 91e5bfc8..7f6f4f50 100644
--- a/cli/injection/mixin.go
+++ b/cli/injection/mixin.go
@@ -1,4 +1,4 @@
-// Copyright 2022 jim.zoumo@gmail.com
+// Copyright 2023 jim.zoumo@gmail.com
 //
 // 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/cli/injection/types.go b/cli/injection/types.go
index f5fd887d..1d99d8f7 100644
--- a/cli/injection/types.go
+++ b/cli/injection/types.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package injection
 
 import (
diff --git a/cli/plugin/interfrace.go b/cli/plugin/interfrace.go
index c9204047..b385cac3 100644
--- a/cli/plugin/interfrace.go
+++ b/cli/plugin/interfrace.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package plugin
 
 import (
diff --git a/cli/plugin/plugin.go b/cli/plugin/plugin.go
index 588691c0..6cb057b4 100644
--- a/cli/plugin/plugin.go
+++ b/cli/plugin/plugin.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package plugin
 
 import (
diff --git a/exec/exec.go b/exec/exec.go
index 42c7edd9..7a6ee8e5 100644
--- a/exec/exec.go
+++ b/exec/exec.go
@@ -1,18 +1,17 @@
-/*
-Copyright 2020 Jim Zhang (jim.zoumo@gmail.com). 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
+// Copyright 2023 jim.zoumo@gmail.com
+//
+// 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.
 
-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.
-*/
 package exec
 
 import (
diff --git a/exec/exec_test.go b/exec/exec_test.go
index 216caa42..5438e817 100644
--- a/exec/exec_test.go
+++ b/exec/exec_test.go
@@ -1,18 +1,16 @@
-/*
-Copyright 2020 Jim Zhang (jim.zoumo@gmail.com). 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 2023 jim.zoumo@gmail.com
+//
+// 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.
 
 package exec
 
diff --git a/exec/multiwriter.go b/exec/multiwriter.go
index 6cddd51b..e1b5e258 100644
--- a/exec/multiwriter.go
+++ b/exec/multiwriter.go
@@ -1,18 +1,17 @@
-/*
-Copyright 2020 Jim Zhang (jim.zoumo@gmail.com). All rights reserved.
+// Copyright 2023 jim.zoumo@gmail.com
+//
+// 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.
 
-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.
-*/
 package exec
 
 import (
diff --git a/exec/probe.go b/exec/probe.go
index a85832f5..79979449 100644
--- a/exec/probe.go
+++ b/exec/probe.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package exec
 
 import (
diff --git a/exec/probe_handler.go b/exec/probe_handler.go
index 2b4e2915..6a8341ca 100644
--- a/exec/probe_handler.go
+++ b/exec/probe_handler.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package exec
 
 import (
diff --git a/execd/execd.go b/execd/execd.go
index c5b29558..551cc2fa 100644
--- a/execd/execd.go
+++ b/execd/execd.go
@@ -1,18 +1,16 @@
-/*
-Copyright 2018 Jim Zhang (jim.zoumo@gmail.com). 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 2023 jim.zoumo@gmail.com
+//
+// 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.
 
 package execd
 
diff --git a/execd/execd_test.go b/execd/execd_test.go
index d1016c18..eb82a1b8 100644
--- a/execd/execd_test.go
+++ b/execd/execd_test.go
@@ -1,18 +1,16 @@
-/*
-Copyright 2018 Jim Zhang (jim.zoumo@gmail.com). 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 2023 jim.zoumo@gmail.com
+//
+// 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.
 
 package execd
 
diff --git a/fileinfo/info.go b/fileinfo/info.go
index a7629e1b..7cfaf85b 100644
--- a/fileinfo/info.go
+++ b/fileinfo/info.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package fileinfo
 
 import (
diff --git a/fileinfo/util.go b/fileinfo/util.go
index 9e87a589..4db686fb 100644
--- a/fileinfo/util.go
+++ b/fileinfo/util.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package fileinfo
 
 import "os"
diff --git a/heap/heap.go b/heap/heap.go
index 61a78bfd..08fab89a 100644
--- a/heap/heap.go
+++ b/heap/heap.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package heap
 
 import (
diff --git a/heap/heap_test.go b/heap/heap_test.go
index 1f9510ab..cb013335 100644
--- a/heap/heap_test.go
+++ b/heap/heap_test.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package heap
 
 import (
diff --git a/lock/maxinflight/max_inflight.go b/lock/maxinflight/max_inflight.go
index ecf4b44f..1e6516b5 100644
--- a/lock/maxinflight/max_inflight.go
+++ b/lock/maxinflight/max_inflight.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package maxinflight
 
 import (
diff --git a/lock/maxinflight/max_inflight_bench_test.go b/lock/maxinflight/max_inflight_bench_test.go
index 8746012e..de2af1d6 100644
--- a/lock/maxinflight/max_inflight_bench_test.go
+++ b/lock/maxinflight/max_inflight_bench_test.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package maxinflight
 
 import (
diff --git a/lock/maxinflight/max_inflight_test.go b/lock/maxinflight/max_inflight_test.go
index 601c15a9..ed19957b 100644
--- a/lock/maxinflight/max_inflight_test.go
+++ b/lock/maxinflight/max_inflight_test.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package maxinflight
 
 import (
diff --git a/netutil/aggregated_listener.go b/netutil/aggregated_listener.go
index 7193e415..d46a914b 100644
--- a/netutil/aggregated_listener.go
+++ b/netutil/aggregated_listener.go
@@ -1,18 +1,16 @@
-/*
-Copyright 2020 Jim Zhang (jim.zoumo@gmail.com). 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 2023 jim.zoumo@gmail.com
+//
+// 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.
 
 package netutil
 
diff --git a/netutil/aggregated_listener_test.go b/netutil/aggregated_listener_test.go
index 051f22d8..2e9591f0 100644
--- a/netutil/aggregated_listener_test.go
+++ b/netutil/aggregated_listener_test.go
@@ -1,18 +1,16 @@
-/*
-Copyright 2020 Jim Zhang (jim.zoumo@gmail.com). 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 2023 jim.zoumo@gmail.com
+//
+// 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.
 
 package netutil
 
diff --git a/netutil/balanced_dailer.go b/netutil/balanced_dailer.go
index 262b1405..231edcae 100644
--- a/netutil/balanced_dailer.go
+++ b/netutil/balanced_dailer.go
@@ -11,6 +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.
+
 package netutil
 
 import (
diff --git a/netutil/net.go b/netutil/net.go
index 12fffa76..de400c2c 100644
--- a/netutil/net.go
+++ b/netutil/net.go
@@ -1,18 +1,16 @@
-/*
-Copyright 2018 Jim Zhang (jim.zoumo@gmail.com). 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 2023 jim.zoumo@gmail.com
+//
+// 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.
 
 package netutil
 
diff --git a/netutil/net_test.go b/netutil/net_test.go
index 2476ae21..64bfcb58 100644
--- a/netutil/net_test.go
+++ b/netutil/net_test.go
@@ -1,18 +1,16 @@
-/*
-Copyright 2018 Jim Zhang (jim.zoumo@gmail.com). 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 2023 jim.zoumo@gmail.com
+//
+// 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.
 
 package netutil
 
diff --git a/pointer/builtin.go b/pointer/builtin.go
index 148e4c12..68fbc116 100644
--- a/pointer/builtin.go
+++ b/pointer/builtin.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package pointer
 
 func Bool(t bool) *bool {
diff --git a/queue/queue.go b/queue/queue.go
index b8e037e8..02e9e722 100644
--- a/queue/queue.go
+++ b/queue/queue.go
@@ -1,18 +1,16 @@
-/*
-Copyright 2018 Jim Zhang (jim.zoumo@gmail.com). 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 2023 jim.zoumo@gmail.com
+//
+// 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.
 
 package queue
 
diff --git a/reflection/reflect.go b/reflection/reflect.go
index 44a051ee..b7ca27cf 100644
--- a/reflection/reflect.go
+++ b/reflection/reflect.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package reflection
 
 import "reflect"
diff --git a/reflection/reflect_test.go b/reflection/reflect_test.go
index 5a4a6eb1..461c487f 100644
--- a/reflection/reflect_test.go
+++ b/reflection/reflect_test.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package reflection
 
 import (
diff --git a/reflection/testdata/gen/main.go b/reflection/testdata/gen/main.go
index 832b9542..2df779f0 100644
--- a/reflection/testdata/gen/main.go
+++ b/reflection/testdata/gen/main.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package main
 
 import (
diff --git a/reflection/testdata/testdata.go b/reflection/testdata/testdata.go
index dca6ffa3..e3ffa35c 100644
--- a/reflection/testdata/testdata.go
+++ b/reflection/testdata/testdata.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 // +build !ignore_autogenerated
 
 // Code generated by controller-gen. DO NOT EDIT.
diff --git a/registry/registry.go b/registry/registry.go
index f010bf09..92a5b4b3 100644
--- a/registry/registry.go
+++ b/registry/registry.go
@@ -1,18 +1,16 @@
-/*
-Copyright 2018 Jim Zhang (jim.zoumo@gmail.com). 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 2023 jim.zoumo@gmail.com
+//
+// 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.
 
 package registry
 
diff --git a/registry/registry_test.go b/registry/registry_test.go
index f176107b..8ca0e10b 100644
--- a/registry/registry_test.go
+++ b/registry/registry_test.go
@@ -1,18 +1,16 @@
-/*
-Copyright 2018 Jim Zhang (jim.zoumo@gmail.com). 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 2023 jim.zoumo@gmail.com
+//
+// 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.
 
 package registry
 
diff --git a/retry/retry.go b/retry/retry.go
index b34694e7..c15a254e 100644
--- a/retry/retry.go
+++ b/retry/retry.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package retry
 
 import (
diff --git a/shell/shell.go b/shell/shell.go
index 0deac30a..a1449279 100644
--- a/shell/shell.go
+++ b/shell/shell.go
@@ -1,18 +1,16 @@
-/*
-Copyright 2019 Jim Zhang (jim.zoumo@gmail.com). 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 2023 jim.zoumo@gmail.com
+//
+// 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.
 
 package shell
 
diff --git a/shell/shell_test.go b/shell/shell_test.go
index a879036c..f94f3185 100644
--- a/shell/shell_test.go
+++ b/shell/shell_test.go
@@ -1,18 +1,16 @@
-/*
-Copyright 2019 Jim Zhang (jim.zoumo@gmail.com). 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 2023 jim.zoumo@gmail.com
+//
+// 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.
 
 package shell
 
diff --git a/signal/signal.go b/signal/signal.go
index 0164fd21..9f1b740e 100644
--- a/signal/signal.go
+++ b/signal/signal.go
@@ -1,18 +1,16 @@
-/*
-Copyright 2018 Jim Zhang (jim.zoumo@gmail.com). 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 2023 jim.zoumo@gmail.com
+//
+// 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.
 
 package signal
 
diff --git a/ssh/krb5/krb5.go b/ssh/krb5/krb5.go
index 7cf1a41c..23804986 100644
--- a/ssh/krb5/krb5.go
+++ b/ssh/krb5/krb5.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package krb5
 
 import (
diff --git a/ssh/krb5/krb5_cache.go b/ssh/krb5/krb5_cache.go
index 7c6bf7df..a5a3d19f 100644
--- a/ssh/krb5/krb5_cache.go
+++ b/ssh/krb5/krb5_cache.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package krb5
 
 import (
diff --git a/ssh/scp/const.go b/ssh/scp/const.go
index ed0b472f..a184cd6b 100644
--- a/ssh/scp/const.go
+++ b/ssh/scp/const.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package scp
 
 import "os"
diff --git a/ssh/scp/reader.go b/ssh/scp/reader.go
index e241af25..248cd702 100644
--- a/ssh/scp/reader.go
+++ b/ssh/scp/reader.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package scp
 
 import (
diff --git a/ssh/scp/scp.go b/ssh/scp/scp.go
index d6d796f7..a4c90a39 100644
--- a/ssh/scp/scp.go
+++ b/ssh/scp/scp.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package scp
 
 import (
diff --git a/ssh/scp/session.go b/ssh/scp/session.go
index ef4ce6fe..41d7264d 100644
--- a/ssh/scp/session.go
+++ b/ssh/scp/session.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package scp
 
 import (
diff --git a/ssh/scp/util.go b/ssh/scp/util.go
index 7cc13c0c..51f0563f 100644
--- a/ssh/scp/util.go
+++ b/ssh/scp/util.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package scp
 
 import (
diff --git a/ssh/shell/shell.go b/ssh/shell/shell.go
index 63bcd073..f99a6ee1 100644
--- a/ssh/shell/shell.go
+++ b/ssh/shell/shell.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package shell
 
 import (
diff --git a/ssh/ssh.go b/ssh/ssh.go
index 94b2e3cc..22a2261b 100644
--- a/ssh/ssh.go
+++ b/ssh/ssh.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package ssh
 
 import (
diff --git a/textencoding/transform.go b/textencoding/transform.go
index 3a083841..5ad4fcdd 100644
--- a/textencoding/transform.go
+++ b/textencoding/transform.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package textencoding
 
 import (
diff --git a/textencoding/transform_test.go b/textencoding/transform_test.go
index b15899b0..e8b4c19e 100644
--- a/textencoding/transform_test.go
+++ b/textencoding/transform_test.go
@@ -1,3 +1,17 @@
+// Copyright 2023 jim.zoumo@gmail.com
+// 
+// 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.
+
 package textencoding
 
 import (