diff --git a/lib/xos-genx/xosgenx/checkers/model_policy.xchecker b/lib/xos-genx/xosgenx/checkers/model_policy.xchecker
index abbdd0d..fc67c2c 100644
--- a/lib/xos-genx/xosgenx/checkers/model_policy.xchecker
+++ b/lib/xos-genx/xosgenx/checkers/model_policy.xchecker
@@ -1,3 +1,20 @@
+{#
+# Copyright 2017-present Open Networking Foundation
+#
+# 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.
+#}
+
+
 {% for m in proto.messages %}
 {% if not m.options.no_policy %}
 {{ xproto_check_policy(m) }}
diff --git a/lib/xos-genx/xosgenx/checkers/service_model_base.xchecker b/lib/xos-genx/xosgenx/checkers/service_model_base.xchecker
index 85881f0..179547e 100644
--- a/lib/xos-genx/xosgenx/checkers/service_model_base.xchecker
+++ b/lib/xos-genx/xosgenx/checkers/service_model_base.xchecker
@@ -1,3 +1,19 @@
+{#
+# Copyright 2017-present Open Networking Foundation
+#
+# 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.
+#}
+
 {# Using regular variables has scoping issues. #}
 {# See: https://stackoverflow.com/questions/7537439/how-to-increment-a-variable-on-a-for-loop-in-jinja-template/7537466 #}
 {% set counter = {
diff --git a/lib/xos-genx/xosgenx/checkers/service_options.xchecker b/lib/xos-genx/xosgenx/checkers/service_options.xchecker
index 383cdbd..6b06d5a 100644
--- a/lib/xos-genx/xosgenx/checkers/service_options.xchecker
+++ b/lib/xos-genx/xosgenx/checkers/service_options.xchecker
@@ -1,3 +1,19 @@
+{#
+# Copyright 2017-present Open Networking Foundation
+#
+# 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.
+#}
+
 {% set required_options = ['name','verbose_name','app_label'] %}
 
 {% for m in proto.messages %}
diff --git a/lib/xos-genx/xosgenx/checkers/syncstep.xchecker b/lib/xos-genx/xosgenx/checkers/syncstep.xchecker
index 836a2c2..c5f9c8f 100644
--- a/lib/xos-genx/xosgenx/checkers/syncstep.xchecker
+++ b/lib/xos-genx/xosgenx/checkers/syncstep.xchecker
@@ -1,3 +1,19 @@
+{#
+# Copyright 2017-present Open Networking Foundation
+#
+# 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.
+#}
+
 {% for m in proto.messages %}
 {% if not m.options.no_sync %}
 {{ xproto_check_synchronizer(m) }}