See the disclaimer page.
IllusionMage is proudly part of the Open Source movement... Main program is based on Blender and released as an open source GNU license... Source code of these content and files is available to be downloaded from here (link to Blender source file).
"Intellectual Property Rights:
Images are either under GPL or released under Creative Commons Attribution-Share Alike 2.0 Generic. Screenshots are attributed to Blender.org."