Copyright restrictions stop at the end of 2015, 70 years after Hitler's death.
Since when did it become vogue to think Hitler died almost 70 years ago? Oh.. I see - the Bunker-Believers are finally swaying the public opinion that the oh-so pat closure to the war was done with Hitler taking a cyanide pill. Pffsst... yeah that's a little too neat.. too gift wrapped for the historical shelves if you asked me. It is pretty clear he escaped on a u-boat and went to South America where he spent the rest of his live puttering around small villages searching for clues on various modern mysteries: the Fountain of Youth, amassing crystal skulls, and finding the lost outpost of Gorilla City. Come on people - this is common knowledge!
Assuming he didn't find the fountain of youth he had another good twenty years on him - which means those patents are pushed back that far as well! Problem solved!