This file is indexed.

/usr/share/doc/sox/README.source is in sox 14.4.1-5+deb9u1.

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

The actual contents of the file can be viewed below.

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Package Structure
-----------------
Say the upstream SoX version is 14.4.1. The orig tarball is created by renaming
sox-14.4.1.tar.gz to sox_14.4.1.orig.tar.gz .

Modifying and Patching the Source
---------------------------------
Patches are or can be applied using quilt. See the excellent tutorial on how to
use quilt by Raphaƫl Hertzog:
http://raphaelhertzog.com/2012/08/08/how-to-use-quilt-to-manage-patches-in-debian-packages/

 -- Pascal Giard <pascal@debian.org>  Tue, 22 Jan 2013 22:56:30 -0500