Not true... and Revell puts their notice on the outside on all of their kits. Airfix on the inside... go figure.As I understand it, there is a difference between how licensors view model kits. A "glue" kit is a model - a display piece, and therefore the copyright appears on the inside of the part. However, a "snap" kit is regarded as a toy, and toys must have the copyright notice visible on the outside.
I have built several of the snap Enterprise kits, and none of the copyright notices are visible once removed, primed and painted.