Theos (and by extension, Logos) is available under the provisions of the GNU
General Public License, version 3 (or later), available here:
http://www.gnu.org/licenses/gpl-3.0.html.

Projects created using Theos and/or Logos are not considered derivative works
(from a licensing standpoint, or, for that matter, any other standpoint) and
are, as such, not required to be licensed under the GNU GPL.

The included project templates are license-free. The use of a template does
not confer a license to your project.