license: add refs related to font Tratex

LICENSE.rst

@@ -1,11 +1,19 @@
-**VUnit**, except for the projects below, is released under the terms of
-`Mozilla Public License, v. 2.0`_. |copy| 2014-2021 Lars Asplund, lars.anders.asplund@gmail.com.
+**VUnit**, except for the projects below, is released under the terms of `Mozilla Public License, v. 2.0`_.
+|copy| 2014-2021 Lars Asplund, lars.anders.asplund@gmail.com.
 
-The following libraries are `redistributed`_ with VUnit for your convenience:
+The following libraries are `redistributed`_ with VUnit for convenience:
 
-* **OSVVM** (``vunit/vhdl/osvvm``): these files are licensed under the terms of `Apache License, v 2.0`_, |copy| 2010 - 2021 by `SynthWorks Design Inc`_. All rights reserved.
+* **OSVVM** (``vunit/vhdl/osvvm``): these files are licensed under the terms of `Apache License, v 2.0`_,
+  |copy| 2010 - 2021 by `SynthWorks Design Inc`_. All rights reserved.
+
+* **JSON-for-VHDL** (``vunit/vhdl/JSON-for-VHDL``): these files are licensed under the terms of `Apache License,
+  v 2.0`_, |copy| 2015 - 2021 Patrick Lehmann.
+
+The font used in VUnit's logo and illustrations is 'Tratex', the traffic sign typeface used on swedish road signs:
+
+- `transportstyrelsen.se: Teckensnitt <https://transportstyrelsen.se/sv/vagtrafik/Trafikregler/Om-vagmarken/Teckensnitt/>`__
+- `Wikipedia: Tratex <https://en.wikipedia.org/wiki/Tratex>`__
 
-* **JSON-for-VHDL** (``vunit/vhdl/JSON-for-VHDL``): these files are licensed under the terms of `Apache License, v 2.0`_, |copy| 2015 - 2021 Patrick Lehmann.
 
 .. |copy|   unicode:: U+000A9 .. COPYRIGHT SIGN
 .. _redistributed: https://github.com/VUnit/vunit/blob/master/.gitmodules