That revolves around print on demand for books that are out of copyright or where the copyright has been abandoned.

> Background Valancourt Books is a print-on-demand independent publishing house specializing in rare and out-of-print books. Valancourt had not registered its books for copyright as the Library of Congress already had original-edition copies of the books Valancourt republishes and any new material in its publications was limited to notes and introductions.

If you want a physical copy of The Sorrows of Satan, you can buy it from them.

Their argument is that the Library of Congress already has a copy of the book ( https://search.catalog.loc.gov/instances/a0f8fcfe-a255-55d2-... ) and having them deposit it again would be unnecessary.

> The Copyright Office has stated that it would modify the language of its deposit demand letters and withdraw its demand for copies if the Copyright Office was notified of the copyright's abandonment.

> Several legislative changes have been proposed to address all elements of the case: changes to Section 407 to tie some legal benefit to the deposit, monetary compensation to copyright holders for depositing books, and regulation for a simple and costless method of copyright abandonment.

That doesn't change that if you were to publish a book today (or for that matter, have published a book in the past 100 years in the US), you are required to deposit a copy of the book with the Library of Congress.