This file is indexed.

/etc/sane.d/cardscan.conf is in libsane-common 1.0.24-8+deb8u2.

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

The actual contents of the file can be viewed below.

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# For scanners connected via USB on a known device (kernel driver):
#usb /dev/usb/scanner0

# For scanners connected via USB using vendor and device ids (libusb):
#usb VENDORID PRODUCTID

# NOTE: if you have to add your device here- please send the id and model
# to the author via email, so it can be included in next version. kitno455 at
# gmail dot com - with cardscan in the subject line

# Corex Cardscan 800c
usb 0x08f0 0x0005

# Corex Cardscan 600c
has_cal_buffer 0
lines_per_block 1
usb 0x08f0 0x0002