This file is indexed.

/usr/share/doc/linux-doc/video4linux/not-in-cx2388x-datasheet.txt is in linux-doc 3.13.0-98.145.

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

The actual contents of the file can be viewed below.

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=================================================================================
MO_OUTPUT_FORMAT (0x310164)

  Previous default from DScaler: 0x1c1f0008
  Digit 8: 31-28
  28: PREVREMOD = 1

  Digit 7: 27-24 (0xc = 12 = b1100 )
  27: COMBALT = 1
  26: PAL_INV_PHASE
    (DScaler apparently set this to 1, resulted in sucky picture)

  Digits 6,5: 23-16
  25-16: COMB_RANGE = 0x1f [default] (9 bits -> max 512)

  Digit 4: 15-12
  15: DISIFX = 0
  14: INVCBF = 0
  13: DISADAPT = 0
  12: NARROWADAPT = 0

  Digit 3: 11-8
  11: FORCE2H
  10: FORCEREMD
  9: NCHROMAEN
  8: NREMODEN

  Digit 2: 7-4
  7-6: YCORE
  5-4: CCORE

  Digit 1: 3-0
  3: RANGE = 1
  2: HACTEXT
  1: HSFMT

0x47 is the sync byte for MPEG-2 transport stream packets.
Datasheet incorrectly states to use 47 decimal. 188 is the length.
All DVB compliant frontends output packets with this start code.

=================================================================================