I had an idea around VASSAL and I was looking at VASSAL licence. In the
FAQ, I saw this :
The VASSAL.jar file is proprietary and may not be redistributed
without written authorization. This component contains software that
enables a module to require password registration before it can be
played. If you are interested in creating a commercial application
based on a VASSAL module, contact Rodney Kinney.
How can I contact Rodney about this matter ?
You don’t need to, it’s not current. This hasn’t been the case since
at least 2005. VASSAL is LGPL.