This file is indexed.

/lib/udev/rules.d/40-timer-permissions.rules is in ubuntustudio-default-settings 0.54.

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

The actual contents of the file can be viewed below.

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# make precisian timers accessable to audio group and MIDI
#
# created Sep 3 2012

KERNEL=="rtc0", GROUP="audio"
KERNEL=="hpet", GROUP="audio"