Proust audiobook copyright

Wanting to listen to the Naxos production of Proust's Remembrance of Things Past audiobook, volumes 5-7, but it seems copyright issue exists (?)

https://www.naxosaudiobooks.com/captive-the-unabridged/

UPDATE:

From Naxos; current US law requires a waiting period of 95 years:

The 1998 Sonny Bono bill means that the final two volumes will, unfortunately, not be available in the USA until 2020 (The Fugitive, Vol.6) and 2022 (Time Regained, Vol.7).

The Captive (Vol.5) has just been made available in the USA once again: https://www.naxosaudiobooks.com/captive-the-unabridged/