This file is indexed.

/usr/share/doc/libbison-dev/copyright is in libbison-dev 2:3.0.4.dfsg-1.

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

The actual contents of the file can be viewed below.

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Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: Bison
Upstream-Contact: bug-bison@gnu.org
Source: http://ftp.gnu.org/pub/gnu/bison/
Comment: 
 This file is extracted from upstream source with debian/repack, which
 moves the non-DFSG-free parts of the upstream source into a separate
 bison-doc package (which is not part of Debian).

Files: *
Copyright: 1984, 1986, 1987-2015 Free Software Foundation, Inc.
License: GPL-3+
 On Debian systems, the full text of the GNU General Public License
 Version 3 can be found in the file
 '/usr/share/common-licenses/GPL-3'.

Files: debian/*
Copyright: 2015 Chuan-kai Lin <cklin@debian.org>
License: GPL-2+
 On Debian systems, the full text of the GNU General Public License
 Version 2 can be found in the file
 '/usr/share/common-licenses/GPL-2'.