LibreCAD is a comprehensive, 2D CAD application that you can download and install for free.
There is a large base of satisfied LibreCAD users worldwide, and it is available in more than 20 languages and for all major operating systems, including Microsoft Windows, Mac OS X and Linux (Debian, Ubuntu, Fedora, Mandriva, Suse,...).
You can download, install and distribute LibreCAD freely, with no fear of copyright infringement.