Banned for being a fucking idiot, yes you need proof when fighting a copyright case in court. However in every country that matters the creators are assumed the creators until challenged. Which means they have default copyrights even if not registered. There is a difference between trademarks and other facets. It's not a black and white world. And indeed it would take a lot of paperwork and red tape to make your case. But that doesnt mean it doesnt exist.
Also, I like how you used Mickey Mouse THE REASON copyrights and trademarks dont expire in a reasonable timeframes, as your example of things expiring... You are really really misinformed.