Where's Hulk when you need him.
I have a little legal experience, but I'm nowhere near the legal eagle that
is.
First thing I note is that Smallville started before 2004, which is when these ladies assumed the copyrights to Superboy.
Secondly, Clark has never been referred to as the Superboy character and he doesnt wear the costume.
Thirdly, its in the story of Superman that he grew up in Smallville when he was a teenager.
Anyway, this dispute has been going since 2004 and probably wont be settled before Smallville ends.