This file is indexed.

/usr/lib/R/library/lattice/LICENSE is in r-cran-lattice 0.20-0-1.

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

The actual contents of the file can be viewed below.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
This software is distributed under the terms of the GNU General Public
License as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

As of writing, this essentially boils down to two possible licenses,
GPL version 2 and version 3.  Copies of these licenses are available
in files GPL-2 and GPL-3 in the sources of this package, as well as at

http://www.r-project.org/Licenses/

They can also be viewed from within R using 

RShowDoc("GPL-2")
RShowDoc("GPL-3")