diff --git a/u_common.go b/u_common.go
index 8b0bc27..094f172 100644
--- a/u_common.go
+++ b/u_common.go
@@ -1,3 +1,7 @@
+// Copyright 2017 Google Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package tls
 
 import "fmt"
diff --git a/u_conn.go b/u_conn.go
index ae80794..774d455 100644
--- a/u_conn.go
+++ b/u_conn.go
@@ -1,3 +1,7 @@
+// Copyright 2017 Google Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package tls
 
 import (
diff --git a/u_conn_test.go b/u_conn_test.go
index 6858833..9089898 100644
--- a/u_conn_test.go
+++ b/u_conn_test.go
@@ -1,3 +1,7 @@
+// Copyright 2017 Google Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package tls
 
 import (
diff --git a/u_parrots.go b/u_parrots.go
index 266405b..7ace4bb 100644
--- a/u_parrots.go
+++ b/u_parrots.go
@@ -1,3 +1,7 @@
+// Copyright 2017 Google Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package tls
 
 import (
diff --git a/u_public.go b/u_public.go
index 53f2049..66f1293 100644
--- a/u_public.go
+++ b/u_public.go
@@ -1,3 +1,7 @@
+// Copyright 2017 Google Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package tls
 
 import (
diff --git a/u_tls_extensions.go b/u_tls_extensions.go
index 16263cd..a66dc67 100644
--- a/u_tls_extensions.go
+++ b/u_tls_extensions.go
@@ -1,3 +1,7 @@
+// Copyright 2017 Google Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package tls
 
 import (