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diff --git a/src/reel_mxf.h b/src/reel_mxf.h
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+/*
+    Copyright (C) 2012-2015 Carl Hetherington <cth@carlh.net>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+/** @file  src/reel_mxf.h
+ *  @brief ReelMXF
+ */
+
+#ifndef LIBDCP_REEL_ENCRYPTABLE_ASSET_H
+#define LIBDCP_REEL_ENCRYPTABLE_ASSET_H
+
+#include <boost/optional.hpp>
+#include <boost/shared_ptr.hpp>
+#include <string>
+
+namespace cxml {
+	class Node;
+}
+
+namespace dcp {
+
+/** @class ReelMXF
+ *  @brief Part of a Reel's description which refers to an asset which can be encrypted.
+ */
+class ReelMXF
+{
+public:
+	ReelMXF () {}
+	ReelMXF (boost::optional<std::string> key_id);
+	ReelMXF (boost::shared_ptr<const cxml::Node>);
+
+	/** @return the 4-character key type for this MXF (MDIK, MDAK, etc.) */
+	virtual std::string key_type () const = 0;
+	
+	/** @return true if a KeyId is specified for this asset, implying
+	 *  that its content is encrypted.
+	 */
+	bool encrypted () const {
+		return _key_id;
+	}
+
+	/** @return Key ID to describe the key that encrypts this asset's
+	 *  content, if there is one.
+	 */
+	boost::optional<std::string> key_id () const {
+		return _key_id;
+	}
+
+private:
+	boost::optional<std::string> _key_id; ///< The &lt;KeyId&gt; from the reel's entry for this asset, if there is one
+};
+
+}
+
+#endif