diff --git a/utils/nio/src/main/java/org/onlab/nio/AbstractMessage.java b/utils/nio/src/main/java/org/onlab/nio/AbstractMessage.java
index e7503e9..08d9e00 100644
--- a/utils/nio/src/main/java/org/onlab/nio/AbstractMessage.java
+++ b/utils/nio/src/main/java/org/onlab/nio/AbstractMessage.java
@@ -1,3 +1,21 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
 package org.onlab.nio;
 
 /**
diff --git a/utils/nio/src/main/java/org/onlab/nio/AcceptorLoop.java b/utils/nio/src/main/java/org/onlab/nio/AcceptorLoop.java
index 785dbf9..63e0cb2 100644
--- a/utils/nio/src/main/java/org/onlab/nio/AcceptorLoop.java
+++ b/utils/nio/src/main/java/org/onlab/nio/AcceptorLoop.java
@@ -1,3 +1,21 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
 package org.onlab.nio;
 
 import java.io.IOException;
diff --git a/utils/nio/src/main/java/org/onlab/nio/IOLoop.java b/utils/nio/src/main/java/org/onlab/nio/IOLoop.java
index dc3ecaf..35a8b7c 100644
--- a/utils/nio/src/main/java/org/onlab/nio/IOLoop.java
+++ b/utils/nio/src/main/java/org/onlab/nio/IOLoop.java
@@ -1,3 +1,21 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
 package org.onlab.nio;
 
 import java.io.IOException;
diff --git a/utils/nio/src/main/java/org/onlab/nio/Message.java b/utils/nio/src/main/java/org/onlab/nio/Message.java
index 5ce6d44..8dff03c 100644
--- a/utils/nio/src/main/java/org/onlab/nio/Message.java
+++ b/utils/nio/src/main/java/org/onlab/nio/Message.java
@@ -1,3 +1,21 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
 package org.onlab.nio;
 
 /**
diff --git a/utils/nio/src/main/java/org/onlab/nio/MessageStream.java b/utils/nio/src/main/java/org/onlab/nio/MessageStream.java
index c38f0f5..9c9bca8 100644
--- a/utils/nio/src/main/java/org/onlab/nio/MessageStream.java
+++ b/utils/nio/src/main/java/org/onlab/nio/MessageStream.java
@@ -1,3 +1,21 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
 package org.onlab.nio;
 
 import org.onlab.util.Counter;
diff --git a/utils/nio/src/main/java/org/onlab/nio/SelectorLoop.java b/utils/nio/src/main/java/org/onlab/nio/SelectorLoop.java
index a74703a..4baa47c 100644
--- a/utils/nio/src/main/java/org/onlab/nio/SelectorLoop.java
+++ b/utils/nio/src/main/java/org/onlab/nio/SelectorLoop.java
@@ -1,3 +1,21 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
 package org.onlab.nio;
 
 import org.slf4j.Logger;
diff --git a/utils/nio/src/main/java/org/onlab/nio/package-info.java b/utils/nio/src/main/java/org/onlab/nio/package-info.java
index 144236f..c772afb 100644
--- a/utils/nio/src/main/java/org/onlab/nio/package-info.java
+++ b/utils/nio/src/main/java/org/onlab/nio/package-info.java
@@ -1,3 +1,22 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ */
+
 /**
  * Mechanism to transfer messages over network using IO loop and
  * message stream, backed by NIO byte buffers.