There's much journalistic hay being made over the recent republication of Mein Kampf in Germany as Adolf Hitler's bestselling work of epic fantasy hurtles towards public domain status.
All of these articles mention that copyright was held by the state of Bavaria in the aftermath of World War II, but - anecdotally - the book has clearly remained in publication and I can only assume that it was in print prior to 1996 (our noble cut-off point).
Here's a bunch on Amazon for a start.
So, post-World War II was the copyright simply not respected? Or were there existing licensees that merely continued to publish as was their legal right? Or are there other factors that are relevant?
For the US that question is easy to answer:
The US government seized the copyright in 1942 under the Trading with the enemy act and sold in 1979 to Houghton Mifflin which is the current US publisher of Mein Kampf.
In the EU and other parts of the world the situation is a bit more difficult but in several countries the copyright from before WWII is still in effect when the book was published in translation there. Also in some countries, it is easy to find unlicensed reprints from the internet or other sources since the state of Bavaria spends little time and resources on pursuing court cases concerning the copy right. This has certainly to do with them being rather uncomfortable with the whole thing. I mean, the new commented edition just came out but with only a print of about 4000 copies and so it was sold out immediately with the pre-orders alone.