This file is indexed.

/etc/brltty/Input/pm/keyboard.kti is in brltty 5.3.1-2ubuntu2.

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

The actual contents of the file can be viewed below.

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###############################################################################
# BRLTTY - A background process providing access to the console screen (when in
#          text mode) for a blind person using a refreshable braille display.
#
# Copyright (C) 1995-2015 by The BRLTTY Developers.
#
# BRLTTY comes with ABSOLUTELY NO WARRANTY.
#
# This is free software, placed under the terms of the
# GNU Lesser General Public License, as published by the Free Software
# Foundation; either version 2.1 of the License, or (at your option) any
# later version. Please see the file LICENSE-LGPL for details.
#
# Web Page: http://brltty.com/
#
# This software is maintained by Dave Mielke <dave@mielke.cc>.
###############################################################################

# This key subtable is for Papenmeier displays which have a braille keyboard.

map Dot1 DOT1
map Dot2 DOT2
map Dot3 DOT3
map Dot4 DOT4
map Dot5 DOT5
map Dot6 DOT6
map Dot7 DOT7
map Dot8 DOT8

map LeftSpace SPACE
map RightSpace SPACE
map LeftThumb CONTROL
map RightThumb META

assign chord Space+
include ../chords.kti
assign noUnchorded

hide on
assign chord LeftSpace+
include ../chords.kti

assign chord RightSpace+
include ../chords.kti
hide off