diff --git a/core/src/main/java/com/google/bitcoin/protocols/channels/IPaymentChannelClient.java b/core/src/main/java/com/google/bitcoin/protocols/channels/IPaymentChannelClient.java
index 1e00edec..49f8249e 100644
--- a/core/src/main/java/com/google/bitcoin/protocols/channels/IPaymentChannelClient.java
+++ b/core/src/main/java/com/google/bitcoin/protocols/channels/IPaymentChannelClient.java
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * 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.
+ */
+
 package com.google.bitcoin.protocols.channels;
 
 import com.google.common.util.concurrent.ListenableFuture;
diff --git a/core/src/main/java/com/google/bitcoin/protocols/channels/PaymentChannelCloseException.java b/core/src/main/java/com/google/bitcoin/protocols/channels/PaymentChannelCloseException.java
index 1036645b..6e90efcd 100644
--- a/core/src/main/java/com/google/bitcoin/protocols/channels/PaymentChannelCloseException.java
+++ b/core/src/main/java/com/google/bitcoin/protocols/channels/PaymentChannelCloseException.java
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * 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.
+ */
+
 package com.google.bitcoin.protocols.channels;
 
 /**
diff --git a/core/src/main/java/com/google/bitcoin/protocols/channels/PaymentChannelServer.java b/core/src/main/java/com/google/bitcoin/protocols/channels/PaymentChannelServer.java
index b503524d..945d417e 100644
--- a/core/src/main/java/com/google/bitcoin/protocols/channels/PaymentChannelServer.java
+++ b/core/src/main/java/com/google/bitcoin/protocols/channels/PaymentChannelServer.java
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * 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.
+ */
+
 package com.google.bitcoin.protocols.channels;
 
 import com.google.bitcoin.core.*;
diff --git a/core/src/main/java/com/google/bitcoin/protocols/channels/ValueOutOfRangeException.java b/core/src/main/java/com/google/bitcoin/protocols/channels/ValueOutOfRangeException.java
index 8095dffd..4801253b 100644
--- a/core/src/main/java/com/google/bitcoin/protocols/channels/ValueOutOfRangeException.java
+++ b/core/src/main/java/com/google/bitcoin/protocols/channels/ValueOutOfRangeException.java
@@ -1,3 +1,19 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * 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.
+ */
+
 package com.google.bitcoin.protocols.channels;
 
 /**