Realsoft 3D includes Revolution4D plugin, which is built on Open CASCADE Technology software version 7.1.
Realsoft 3D ™ is a trademark of Realsoft Graphics Oy, Finland.
Revolution4D™ is a trademark of Alessandro Tasora, Italy. The software is governed by BSD license.
Open CASCADE Technology software is governed by GNU Lesser General Public License (LGPL) version 2.1 with additional exception. The license can be found in opencascade.com/content/licensing.