To generate these refcards, you need to install the TeX document
production system.  For example, http://www.tug.org/texlive/ .

All modern GNU/Linux distributions provide TeX packages, so the
easiest way is just to install those.  Your distribution may have
split some of the files needed to process non-English output into
separate, optional packages such as: texlive-lang-cyrillic,
texlive-lang-czechslovak, texlive-lang-german, and texlive-lang-polish.


COPYRIGHT AND LICENSE INFORMATION FOR IMAGE FILES

The file gnus-logo.eps contains copyright and license information, but
it is reproduced here for convenience.

File: gnus-logo.eps, gnus-logo.pdf
  Author: Luis Fernandes <elf@ee.ryerson.ca>
  Copyright (C) 2001-2012 Free Software Foundation, Inc.
  License: GNU General Public License version 3 or later (see COPYING)