So by this logic, one could ask Cloanto and whoever to prove their rights.
See: SCO vs the world. What a mess it would be. From my understanding, the whole Amiga saga is so loose that I would wager very few could prove anything.
But AmigaEd inspires, if I say so myself, an interesting idea. If the USPTO had a method for challenging claimed copyrights and trademarks. Person X or Company Y claims copyright on Article Z, Person A or Company B challenges said claim, essentially a "show me the paperwork" demand. This would be an offensive suit rather than defensive for violation.
I can see how this could easily be abused. Say some Little Guy(tm) copyrights something, and Big Nasty Company(tm) challenges with the intent to bankrupt with legal fees. It should be the onus of the loser to absorb legal costs, which I would think would squash some of the frivolous attacks.
