This file is indexed.

/usr/share/cups/usb/org.cups.usb-quirks is in cups-server-common 2.1.3-4.

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

The actual contents of the file can be viewed below.

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# USB backend 'quirks' file.
#
# This file lists known issues with various vendors or printers.  Each
# line contains either a comment (starting with #) or the USB vendor ID,
# product ID (omit for all vendor products), and a list of known issues:
#
#   blacklist     The printer is not functional with the USB backend.
#   delay-close   Delay close/reset of selected interface
#   no-reattach   Do no re-attach usblp kernel module after printing.
#   soft-reset    Do a soft reset after printing for cleanup.
#   unidir        Only supported unidirectional I/O
#   usb-init      Needs vendor USB initialization string.
#   vendor-class  Uses vendor-specific class or subclass.
#   whitelist     The printer is functional with the USB backend.

# HP DeskJet 895C
0x03f0 0x0004 unidir

# HP DeskJet 880C
0x03f0 0x0104 unidir

# HP DeskJet 815C
0x03f0 0x0204 unidir

# HP DeskJet 810C/812C
0x03f0 0x0304 unidir

# HP DeskJet 830C
0x03f0 0x0404 unidir

# HP DeskJet 885C
0x03f0 0x0504 unidir

# HP DeskJet 840C
0x03f0 0x0604 unidir

# HP DeskJet 816C
0x03f0 0x0804 unidir

# HP Deskjet 959C
0x03f0 0x1104 unidir

# NEC Picty900 (HP OEM)
0x0409 0xefbe unidir

# NEC Picty760 (HP OEM)
0x0409 0xbef4 unidir

# NEC Picty920 (HP OEM)
0x0409 0xf0be unidir

# NEC Picty800 (HP OEM)
0x0409 0xf1be unidir

# Lexmark International, Inc. (e250d), https://bugs.launchpad.net/bugs/1084164
0x043d 0x00f3 no-reattach

# Kyocera Mita FS 820, by zut <kernel@zut.de>
0x0482 0x0010 unidir

# Canon, Inc. PIXMA iP6000D Printer, https://bugs.launchpad.net/bugs/1160638
0x04a9 0x1095 unidir

# Canon, Inc. PIXMA iP4200 Printer, http://www.cups.org/str.php?L4155
0x04a9 0x10a2 unidir

# Canon, Inc. PIXMA iP4300 Printer, https://bugs.launchpad.net/bugs/1032385
0x04a9 0x10b6 unidir

# Canon, Inc. MP210 https://bugzilla.redhat.com/show_bug.cgi?id=847923#c53
0x04a9 0x1721 unidir

# Canon, Inc. MP500 Printer, https://bugs.launchpad.net/bugs/1032456
0x04a9 0x170c unidir

# Canon, Inc. MP510 Printer, https://bugs.launchpad.net/bugs/1050009
0x04a9 0x1717 unidir

# Canon, Inc. MP550 Printer, http://www.cups.org/str.php?L4155
0x04a9 0x173d unidir

# Canon, Inc. MP560 Printer, http://www.cups.org/str.php?L4155
0x04a9 0x173e unidir

# Canon, Inc. MF4150 Printer, https://bugs.launchpad.net/bugs/1160638
0x04a9 0x26a3 no-reattach

# Brother Industries, Ltd HL-1250 Laser Printer, https://bugs.debian.org/712512
0x04f9 0x0007 no-reattach

# Brother Industries, Ltd HL-1430 Laser Printer, https://bugs.launchpad.net/bugs/1038695
0x04f9 0x001a no-reattach

# Brother Industries, Ltd HL-1440 Laser Printer, https://bugs.launchpad.net/bugs/1000253
0x04f9 0x000d no-reattach unidir

# Brother Industries, Ltd HL-1450 Laser Printer, https://bugs.launchpad.net/bugs/1000253
0x04f9 0x000e no-reattach unidir

# Oki Data Corp. Okipage 14ex Printer, https://bugs.launchpad.net/bugs/872483
0x06bc 0x000b no-reattach

# Oki Data Corp. B410d, https://bugs.launchpad.net/bugs/872483
0x06bc 0x01c7 no-reattach

# Seiko Epson Corp. Stylus Color 740 / Photo 750, http://bugs.debian.org/697970
0x04b8 0x0001 no-reattach unidir

# Seiko Epson Corp. Stylus Color 670, https://bugs.launchpad.net/bugs/872483
0x04b8 0x0005 no-reattach

# Seiko Epson Receipt Printer M129C
0x04b8 0x0202 vendor-class

# Prolific Technology, Inc. PL2305 Parallel Port (USB -> Parallel adapter), https://bugs.launchpad.net/bugs/987485
0x067b 0x2305 no-reattach soft-reset unidir

# Xerox Phaser 3124 https://bugzilla.redhat.com/show_bug.cgi?id=867392
0x0924 0x3ce9 no-reattach

# Xerox WorkCentre 3210 https://bugs.launchpad.net/bugs/1102470
0x0924 0x4293 no-reattach

# Xerox WorkCentre 3220 https://bugs.launchpad.net/bugs/1406203 https://github.com/apple/cups/issues/4789
0x0924 0x4294 no-reattach

# QinHeng Electronics CH340S (USB -> Parallel adapter), https://bugs.launchpad.net/bugs/1000253
0x1a86 0x7584 no-reattach

# All Samsung devices, https://bugs.launchpad.net/bugs/1032456
0x04e8 soft-reset

# All Zebra devices, https://bugs.launchpad.net/bugs/1001028
0x0a5f unidir

# Canon CP-10
0x04a9 0x304a blacklist

# Canon CP-100
0x04a9 0x3063 blacklist

# Canon CP-200
0x04a9 0x307c blacklist

# Canon CP-300
0x04a9 0x307d blacklist

# Canon CP-220
0x04a9 0x30bd blacklist

# Canon CP-330
0x04a9 0x30be blacklist

# Canon SELPHY CP400
0x04a9 0x30f6 blacklist

# Canon SELPHY CP600
0x04a9 0x310b blacklist

# Canon SELPHY CP710
0x04a9 0x3127 blacklist

# Canon SELPHY CP510
0x04a9 0x3128 blacklist

# Canon SELPHY ES1
0x04a9 0x3141 blacklist

# Canon SELPHY CP730
0x04a9 0x3142 blacklist

# Canon SELPHY CP720
0x04a9 0x3143 blacklist

# Canon SELPHY CP750
0x04a9 0x3170 blacklist

# Canon SELPHY CP740
0x04a9 0x3171 blacklist

# Canon SELPHY ES2
0x04a9 0x3185 blacklist

# Canon SELPHY ES20
0x04a9 0x3186 blacklist

# Canon SELPHY CP770
0x04a9 0x31aa blacklist

# Canon SELPHY CP760
0x04a9 0x31ab blacklist

# Canon SELPHY ES30
0x04a9 0x31b0 blacklist

# Canon SELPHY CP780
0x04a9 0x31dd blacklist

# Canon SELPHY ES40
0x04a9 0x31ee blacklist

# Canon SELPHY CP800
0x04a9 0x3214 blacklist

# Canon SELPHY CP900
0x04a9 0x3255 blacklist

# Canon SELPHY CP810
0x04a9 0x3256 blacklist

# Canon SELPHY CP500
0x04a9 0x30f5 blacklist

# Canon SELPHY ES3
0x04a9 0x31af blacklist

# Canon SELPHY CP780
0x04a9 0x31dd blacklist

# Lexmark E238 (<rdar://problem/14493054>)
0x043d 0x00d7 no-reattach

# Lexmark E238 (STR #4448)
0x043d 0x009a no-reattach

# Lexmark C540n (STR #4778)
0x043d 0x0139 no-reattach

# Canon MX310 (STR #4482)
0x04a9 0x1728 unidir

# Canon MX320 (STR #4482)
0x04A9 0x1736 unidir

# All Intermec devices (STR #4553)
0x067e no-reattach

# HP LaserJet 1150 (STR #4549)
0x03f0 0x0f17 delay-close

# HP LaserJet 1300 (STR #4549)
0x03f0 0x1017 delay-close
0x03f0 0x1117 delay-close

# HP LaserJet 1320 (STR #4549)
0x03f0 0x1d17 delay-close

# Canon, Inc. MP530 Printer
0x04a9 0x1712 unidir