Removed Copyright lines in several files

Change-Id: I213c8843c1f846ed888a1ed919b142f375a88238
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/.gitignore b/.gitignore
index 302f4e1..e0e1ed1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,3 @@
-# Copyright 2020 ETSI
-#
 # 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
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 17fdbc7..37c7930 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,6 +1,4 @@
 <!--
-Copyright 2020 ETSI
-
 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
diff --git a/Dockerfile b/Dockerfile
index 54f0fd5..ac08971 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,3 @@
-# Copyright 2020 ETSI
-#
 # 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
diff --git a/README.md b/README.md
index 8601322..885dfb3 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,4 @@
 <!--
-Copyright 2020 ETSI
-
 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