This file is indexed.

/etc/sane.d/qcam.conf is in libsane-common 1.0.27-1~experimental3ubuntu2.

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

The actual contents of the file can be viewed below.

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#
# In order to use the qcam backend, you'll need to enable to line with
# the port address for your scanner.  You can enable multiple lines if
# you really have a QuickCam connect to each port.
#
#u0x37b # /dev/lp0 forced in unidir mode
#u0x378	# /dev/lp1 forced in unidir mode
#u0x278	# /dev/lp2 forced in unidir mode
#0x37b	# /dev/lp0
#0x378	# /dev/lp1
#0x278	# /dev/lp2
0x3bc	# /dev/lp0