diff --git a/sys/net/include/socket_base/in.h b/sys/net/include/socket_base/in.h
index 28a3893a0b16..a819a5ab76c6 100644
--- a/sys/net/include/socket_base/in.h
+++ b/sys/net/include/socket_base/in.h
@@ -1,3 +1,11 @@
+/*
+ * Copyright (C) 2014  Freie Universität Berlin.
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
 /**
  * socket_base/in.h - Constants defined by the internet system, per RFC 790,
  *                September 1981, and numerous additions, inspired by
diff --git a/sys/net/include/tcp.h b/sys/net/include/tcp.h
index 93e73da320f9..6f9f9f7650da 100644
--- a/sys/net/include/tcp.h
+++ b/sys/net/include/tcp.h
@@ -1,11 +1,9 @@
-/**
- * tcp.h - Wraps all API types, constants and functions of the tcp implementation.
- *
- * Copyright (C) 2013  INRIA.
+/*
+ * Copyright (C) 2013, 2014 INRIA.
  *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License. See the file LICENSE in the top level directory for more
- * details.
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
  */
 
 /**
diff --git a/sys/net/include/udp.h b/sys/net/include/udp.h
index 00833c40c8eb..72683940504d 100644
--- a/sys/net/include/udp.h
+++ b/sys/net/include/udp.h
@@ -1,11 +1,9 @@
-/**
- * udp.h - Wraps all API types, constants and functions of the tcp implementation.
- *
- * Copyright (C) 2013  INRIA.
+/*
+ * Copyright (C) 2013, 2014 INRIA.
  *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License. See the file LICENSE in the top level directory for more
- * details.
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
  */
 
 /**
diff --git a/sys/net/transport_layer/socket_base/socket.c b/sys/net/transport_layer/socket_base/socket.c
index f9c8a0bd530b..d8cffa5b7976 100644
--- a/sys/net/transport_layer/socket_base/socket.c
+++ b/sys/net/transport_layer/socket_base/socket.c
@@ -1,12 +1,12 @@
-/**
- * socket API
- *
- * Copyright (C) 2013  INRIA.
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License. See the file LICENSE in the top level directory for more
- * details.
+/*
+ * Copyright (C) 2013, 2014 INRIA.
  *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
  * @ingroup socket_base
  * @{
  * @file    socket.c
diff --git a/sys/net/transport_layer/socket_base/socket.h b/sys/net/transport_layer/socket_base/socket.h
index ac474cc2b101..0887069925d1 100644
--- a/sys/net/transport_layer/socket_base/socket.h
+++ b/sys/net/transport_layer/socket_base/socket.h
@@ -1,3 +1,11 @@
+/*
+ * Copyright (C) 2014  Freie Universität Berlin.
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
 #ifndef _SOCKET_BASE_SOCKET
 #define _SOCKET_BASE_SOCKET
 
diff --git a/sys/net/transport_layer/udp/udp.c b/sys/net/transport_layer/udp/udp.c
index bb967d942f82..2d39738a66ac 100644
--- a/sys/net/transport_layer/udp/udp.c
+++ b/sys/net/transport_layer/udp/udp.c
@@ -1,12 +1,12 @@
-/**
- * UDP implementation
- *
- * Copyright (C) 2013  INRIA.
- *
- * This file is subject to the terms and conditions of the GNU Lesser General
- * Public License. See the file LICENSE in the top level directory for more
- * details.
+/*
+ * Copyright (C) 2013, 2014 INRIA.
  *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
  * @ingroup udp
  * @{
  * @file    udp.c