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diff --git a/src/system/Qt3DSMemoryFilter.h b/src/system/Qt3DSMemoryFilter.h
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+/****************************************************************************
+**
+** Copyright (C) 1993-2009 NVIDIA Corporation.
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) any later version
+** approved by the KDE Free Qt Foundation. The licenses are as published by
+** the Free Software Foundation and appearing in the file LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#pragma once
+
+//==============================================================================
+//	Namespace
+//==============================================================================
+namespace Q3DStudio {
+
+//==============================================================================
+/**
+ *	Aggregation interface for legacy calls that don't remember allocation size.
+ *
+ *	CMemoryManager and its pools require that the size must be sent along with
+ *	any call, including the Free call.  Normal memory calls do not require this
+ *	information and this filter class is used to intercept these calls and
+ *	add a header to each call before forwarded to the manager.  This thin class
+ *	allows old school calls such as malloc and free to still use the advantages
+ *	of a pooled memory system without impacting the cleanliness and memory
+ *	footprint of the modern system.
+ */
+class CMemoryFilter
+{
+    //==============================================================================
+    //	Constants
+    //==============================================================================
+protected:
+    const static INT32 FILTER_DOGTAG = 0x1337f1d0;
+
+    //==============================================================================
+    //	Methods
+    //==============================================================================
+public: // Allocation Deallocation
+    static void *Allocate(const INT32 inSize, const CHAR *inType, const CHAR *inFile,
+                          const INT32 inLine, const BOOL inClear);
+    static void Free(void *inPointer);
+    static void *Reallocate(void *inPointer, const INT32 inNewSize, const CHAR *inNewType,
+                            const CHAR *inFile, const INT32 inLine);
+};
+
+} // namespace Q3DStudio