diff --git a/src/nbi/service/NbiApplication.py b/src/nbi/service/NbiApplication.py
index 5c2c00eac47765e83faadbf4f167978f83db2e7f..16e6998108aaf0270cf4545ad0e6995e09a0bc7b 100644
--- a/src/nbi/service/NbiApplication.py
+++ b/src/nbi/service/NbiApplication.py
@@ -1,3 +1,18 @@
+# Copyright 2022-2024 ETSI SDG TeraFlowSDN (TFS) (https://tfs.etsi.org/)
+#
+# 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.
+
+
 import logging, time
 from typing import Any, Optional
 from flask import Flask, request
diff --git a/src/nbi/service/websocket_namespaces/hearthbeat/HeartbeatNamespace.py b/src/nbi/service/websocket_namespaces/hearthbeat/HeartbeatNamespace.py
index b9b8b0be2d63e6da79ce8ca658993f78bb8566d5..06a9569c7441e4e4ea25e8da2f64cd5393133afb 100644
--- a/src/nbi/service/websocket_namespaces/hearthbeat/HeartbeatNamespace.py
+++ b/src/nbi/service/websocket_namespaces/hearthbeat/HeartbeatNamespace.py
@@ -1,3 +1,18 @@
+# Copyright 2022-2024 ETSI SDG TeraFlowSDN (TFS) (https://tfs.etsi.org/)
+#
+# 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.
+
+
 import logging, threading, time
 from flask import request
 from flask_socketio import Namespace, join_room, leave_room