Normally I get fed up with issues of copyright infringement and the commensurate lining of lawyer's already bloated pockets. But in this case it really *does* seem that Kryptonite had an agreement w/ DC comics that it choose to break.
-ExM

(Hmmmm, and now that I thihk about it, my last Krypto lock was in a radioactive green package--now how is that NOT alluding to the Superman thing as well?)