diff --git a/internal/trace/context.go b/internal/trace/context.go
index 50d59a26a..8563d73ee 100644
--- a/internal/trace/context.go
+++ b/internal/trace/context.go
@@ -1,3 +1,16 @@
+// Copyright The Notary Project Authors.
+// 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.
+
 // Copied and adapted from oras (https://github.com/oras-project/oras)
 /*
 Copyright The ORAS Authors.
diff --git a/internal/trace/context_test.go b/internal/trace/context_test.go
index 3d640b968..14e35976d 100644
--- a/internal/trace/context_test.go
+++ b/internal/trace/context_test.go
@@ -1,3 +1,16 @@
+// Copyright The Notary Project Authors.
+// 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.
+
 // Copied and adapted from oras (https://github.com/oras-project/oras)
 /*
 Copyright The ORAS Authors.
diff --git a/internal/trace/transport.go b/internal/trace/transport.go
index ec386bcd7..e75d334d0 100644
--- a/internal/trace/transport.go
+++ b/internal/trace/transport.go
@@ -1,3 +1,16 @@
+// Copyright The Notary Project Authors.
+// 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.
+
 // Copied and adapted from oras (https://github.com/oras-project/oras)
 /*
 Copyright The ORAS Authors.
diff --git a/internal/trace/transport_test.go b/internal/trace/transport_test.go
index 601f93072..58e6dfbc2 100644
--- a/internal/trace/transport_test.go
+++ b/internal/trace/transport_test.go
@@ -1,3 +1,16 @@
+// Copyright The Notary Project Authors.
+// 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.
+
 // Copied and adapted from oras (https://github.com/oras-project/oras)
 /*
 Copyright The ORAS Authors.
diff --git a/test/e2e/internal/utils/exec.go b/test/e2e/internal/utils/exec.go
index df1e2ca94..32307377a 100644
--- a/test/e2e/internal/utils/exec.go
+++ b/test/e2e/internal/utils/exec.go
@@ -1,3 +1,16 @@
+// Copyright The Notary Project Authors.
+// 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.
+
 // copied and adopted from https://github.com/oras-project/oras with
 // modification
 /*