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diff --git a/include/VBox/usblib-darwin.h b/include/VBox/usblib-darwin.h
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+/** @file
+ * USBLib - Library for wrapping up the VBoxUSB functionality, Darwin flavor.
+ * (DEV,HDrv,Main)
+ */
+
+/*
+ * Copyright (C) 2007-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * 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, in version 3 of the
+ * License.
+ *
+ * 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, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+#ifndef VBOX_INCLUDED_usblib_darwin_h
+#define VBOX_INCLUDED_usblib_darwin_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <VBox/cdefs.h>
+#include <VBox/usbfilter.h>
+
+RT_C_DECLS_BEGIN
+
+/** @defgroup grp_usblib_darwin     Darwin USB Specifics
+ * @ingroup grp_usblib
+ * @{
+ */
+
+/** @name VBoxUSB specific device properties.
+ * VBoxUSB makes use of the OWNER property for communicating between the probe and
+ * start stage.
+ * USBProxyServiceDarwin makes use of all of them to correctly determine the state
+ * of the device.
+ * @{ */
+/** Contains the pid of the current client. If 0, the kernel is the current client. */
+#define VBOXUSB_CLIENT_KEY  "VBoxUSB-Client"
+/** Contains the pid of the filter owner (i.e. the VBoxSVC pid). */
+#define VBOXUSB_OWNER_KEY   "VBoxUSB-Owner"
+/** Contains the ID of the matching filter. */
+#define VBOXUSB_FILTER_KEY  "VBoxUSB-Filter"
+/** @} */
+
+/** @} */
+
+RT_C_DECLS_END
+
+#endif /* !VBOX_INCLUDED_usblib_darwin_h */
+