/lib/udev/rules.d/61-gnome-bluetooth-rfkill.rules is in gnome-bluetooth 3.2.2-0ubuntu5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | # Set ACLs for console users on /dev/rfkill
# This is necessary until a daemon can properly handle access to the
# kill switch
# http://bugs.debian.org/563902
# https://bugzilla.redhat.com/show_bug.cgi?id=514798
ENV{ACL_MANAGE}=="0", GOTO="gnome_bluetooth_end"
ACTION!="add|change", GOTO="gnome_bluetooth_end"
KERNEL=="rfkill", TAG+="udev-acl"
LABEL="gnome_bluetooth_end"
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