This file is indexed.

/usr/share/cups/ppdc/label.h is in cups-ppdc 1.7.2-0ubuntu1.11.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/*
 * "$Id: label.h 624 2008-02-16 00:27:39Z msweet $"
 *
 *   This file contains model number definitions for the CUPS sample
 *   label printer driver.
 *
 *   Copyright 2007 by Apple Inc.
 *   Copyright 1997-2005 by Easy Software Products.
 *
 *   These coded instructions, statements, and computer programs are the
 *   property of Apple Inc. and are protected by Federal copyright
 *   law.  Distribution and use rights are outlined in the file "LICENSE.txt"
 *   which should have been included with this file.  If this file is
 *   file is missing or damaged, see the license at "http://www.cups.org/".
 */

#define DYMO_3x0	0		/* Dymo Labelwriter 300/330/330 Turbo */

#define ZEBRA_EPL_LINE  0x10            /* Zebra EPL line mode printers */
#define ZEBRA_EPL_PAGE  0x11            /* Zebra EPL page mode printers */
#define ZEBRA_ZPL       0x12            /* Zebra ZPL-based printers */
#define ZEBRA_CPCL      0x13            /* Zebra CPCL-based printers */

#define INTELLITECH_PCL	0x20		/* Intellitech PCL-based printers */

/*
 * End of "$Id: label.h 624 2008-02-16 00:27:39Z msweet $".
 */