ref: adding copyright to the vdl files

Change-Id: I5f0f27333528afdcdbb5d353e2d7283588f1e5d9
diff --git a/security/agent/server/wire.vdl b/security/agent/server/wire.vdl
index 53d94d4..c025f6f 100644
--- a/security/agent/server/wire.vdl
+++ b/security/agent/server/wire.vdl
@@ -1,3 +1,7 @@
+// Copyright 2015 The Vanadium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 // Package server provides a server which keeps a principal in memory
 // and allows clients to use that principal.
 //