Quote - I must be mistaken.. but I thought any screen shots of the Blender interface were GPL material?  I'm not clear how they can sell video tutorials, which most likely show the interface, when screen shots of the interface are GPL and/or Copyrighted.

They are talking about "artwork."  If you decide to take a screen shot of your artwork which includes the components of Blender then you can't claim that as being "your" artwork since it includes components of someone else's work.