This file is indexed.

/usr/share/doc/latex209-base/copyright is in latex209-base 25.mar.1992-17.

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

The actual contents of the file can be viewed below.

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This package was debianized by Nakahara Hayao <nakahara@mis.hiroshima-u.ac.jp>
for Debian JP Project on Sat, 29 Nov 1997 19:33:58 +0900.

Currently maintained by the Debian TeX Maintainer,
former maintainer was TSUCHIYA Masatoshi <tsuchiya@namazu.org>.

It was downloaded from ftp.riken.go.jp (one of CTAN sites).
URL is ftp://ftp.riken.go.jp/pub/tex-archive/obsolete/macros/latex209/distribs/latex209.tar

Upstream Author: Leslie Lamport

Copyright:

latex.tex contains one line copyright:

% Copyright (C) 1992 by Leslie Lamport

There is no other explicit copyright notice, but every free tex distribution
contains latex209. I think latex209 satisfies DFSG.