This file is indexed.

/usr/share/cups/drv/indexv4.drv is in cups-filters 1.8.3-2ubuntu3.

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

The actual contents of the file can be viewed below.

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// 
// Copyright (c) 2015 Samuel Thibault <samuel.thibault@ens-lyon.org>
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// 

#include <media.defs>
#include <media-braille.defs>
#include <liblouis.defs>
#include <imagemagick.defs>
#include <braille.defs>
#include <index.defs>

#po fr "fr-braille.po"

Manufacturer "Index"
Version 1.0

Filter text/vnd.cups-brf 0 textbrftoindexv4
Filter image/vnd.cups-ubrl 0 imageubrltoindexv4

//
// Common options
//

HWMargins 0.5mm 0.5mm 0.5mm 0.5mm
VariablePaperSize true
MinSize 1in 1in

Group "Index/Index support"
  Option "IndexFirmwareVersion/Installed firmware version" PickOne AnySetup 10
  Choice "102000/10.20 or above" ""
  *Choice "103000/10.30 or above" ""
  // Provides DBT but we just use transparent mode
  //Choice "110210/11.02.1 or above" ""

Group "Braille"
  Option "IndexTable/Firmware Braille Table" PickOne AnySetup 10
  Choice "5/American computer 6 dots" ""
  Choice "6/American computer 8 dots" ""
  Choice "7/English computer 8 dots" ""
  Choice "8/English literal without capital" ""
  Choice "9/IBM 437 computer 6 dots" ""
  Choice "10/IBM 437 computer 8 dots" ""
  Choice "11/IBM 850 computer 8 dots" ""
  Choice "12/German computer 8 dots" ""
  Choice "13/Italian literal with capital" ""
  Choice "14/Italian literal without capital" ""
  Choice "15/Portuguese literal with capital" ""
  Choice "16/Spanish computer 6 dots" ""
  Choice "17/Spanish computer 8 dots" ""
  Choice "18/Spanish user defined 3 ANSI" ""
  Choice "19/Spanish user defined 4 ASCII" ""
  Choice "20/Swedish literal without capital" ""
  Choice "21/Polish computer 6 dots" ""
  Choice "22/Polish literal with capital" ""
  Choice "23/Polish own table 03" ""
  Choice "24/Polish own table 04" ""
  Choice "25/Dutch computer 6 dots" ""
  Choice "26/Dutch own table 02" ""


//
// Basic-D
//
{
  ModelName "Basic-D V4"
  PCFileName "ibasicd4.ppd"

  MaxSize 325mm 10m

  Group "Index"
    Option "IndexFolding" PickOne AnySetup 10
    Choice "SingleZ/Single-sided z-folding" ""
    Choice "DoubleZ/Double-sided z-folding" ""
    Choice "SingleSZ/Single-sided sideways z-folding" ""
    Choice "DoubleSZ/Double-sided sideways z-folding" ""
}


//
// Basic-S
//
{
  ModelName "Basic-S V4"
  PCFileName "ibasics4.ppd"

  MaxSize 325mm 10m
}


//
// Everest-D
//
{
  ModelName "Everest-D V4"
  PCFileName "ieveres4.ppd"

  MaxSize 297mm 10m

  Group "Index"
    Option "IndexFolding" PickOne AnySetup 10
    Choice "DoubleS/Double-sided saddle stitch 4 pages" ""
    Choice "SingleS/Single-sided saddle stitch 4 pages" ""
}


//
// Braille Box
//
{
  ModelName "Braille Box V4"
  PCFileName "ibrlbox4.ppd"

  MaxSize 297mm 10m

  Group "Index"
    Option "IndexFolding" PickOne AnySetup 10
    Choice "DoubleS/Double-sided saddle stitch 4 pages" ""
    Choice "SingleS/Single-sided saddle stitch 4 pages" ""
}