Click the link below,and follow the gold pages Company and FAQ page;I know how it could be confusing.... Question Who owns VDK1.0, VDK1.4, VDK 2.0 and TRUDEF™? Answer TMMI has an exclusive license from Iterated Systems for the VDK line and owns TRUDEF™ outright. Perhaps VDK line really means VDK 1-4 SHHHH don't tell anyone, okay????. http://tmmi.us/faq