This file is indexed.

/usr/share/doc/grub-efi-amd64-signed/copyright is in grub-efi-amd64-signed 1.93+2.02-2ubuntu8.

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: GNU GRUB
Source: http://www.gnu.org/software/grub/
Comment:
 This package exists to download a signed binary from the Ubuntu archive and
 publish it in .deb format.  The actual bootloader source code may be found
 in the grub2 source package: 'apt-get source grub2'.

Files: *
Copyright: 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009  Free Software Foundation, Inc
License: GPL-3+

Files: debian/*
Copyright: 2012 Canonical Ltd.
License: GPL-3+

License: GPL-3+
 On Ubuntu systems the full text of the GNU General Public License can be
 found in the `/usr/share/common-licenses/GPL-3' file.