JACK license
University of Duisburg-Essen provides this JACK server as a service. The JACK system is property of University of Duisburg-Essen. All parts of the system including program code, texts, artwork and exercises that were created by the university are protected by copyright regulations. Please contact the Chair "Specification of Software Systems" (Prof. Dr. Michael Goedicke, Gerlingstraße 16, 45127 Essen, jack-support@paluno.uni-due.de), if you wish to learn more on how to access the system.
Contained third-party software
JACK uses the MathDox Formula Editor, which is published under the GNU Lesser General Public License.
JACK uses JSXGraph, which is published under the GNU Lesser General Public License.
JACK uses MathJax, which is published under the Apache License, Version 2.0.
JACK uses CodeMirror, which is published under the MIT License.
JACK uses Apache Jena, which is published under the Apache License, Version 2.0.