This file is indexed.

/usr/share/doc/electric-fence/copyright is in electric-fence 2.2.4.

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 Siggy Brentrup bsb@debian.org on
Wed, 5 Feb 1997 15:53:23 +0100. It is currently maintained by Matthew
Vernon <matthew@debian.org>.

According to the author Bruce Perens <bruce@pixar.com> we can consider it
a genuine Debian package.
But you can download an alternate copy of the source from:
http://metalab.unc.edu/pub/Linux/devel/lang/c/ElectricFence-2.0.5.tar.gz

Copyright:

(c) 1988, 1993 Bruce Perens <bruce@pixar.com>
The program is distributed under the GNU General Public License version 2 
which can be found in /usr/share/common-licenses/GPL-2