What does it mean to be in public domain
That question is answered by the first sentence on the page that this thread is discussing:
> At the start of each year, on January 1st, a new crop of works enter the public domain and become free to enjoy, share, and reuse for any purpose.
that the Hitler estate can't sue you for copyright infringement if you publish it yourself and distribute copies.
That question is answered by the first sentence on the page that this thread is discussing:
> At the start of each year, on January 1st, a new crop of works enter the public domain and become free to enjoy, share, and reuse for any purpose.