The latest it would enter the public domain would be 2031, but the link below may be of interest.
"Dark as a dungeon" would be considered a "common phrase" and as such is not eligible for copyright protection
No; it is not likely to enter the public domain until 2080.
No; it will not enter the public domain until 2051.
Copyright protection is required to be "for a limited time," after which the works enter the public domain, where they can be used by anyone for anything.
No; it is controlled by the Weill Foundation.
Pubic domain occurs naturally when a copyright expires. In theory, a copyright owner can intentionally disclaim any power to enforce a copyright, making it as if it were "public domain".
Edna Ferber's 1924 novel So Big will enter the public domain in 2020.George Orwell's 1948 novel 1984 will enter the public domain in 2021.L. Ron Hubbard's 1980 novel Battlefield Earth will enter the public domain in 2057.Works of J.D. Salinger will enter the public domain in 2081.The Harry Potter novels will be protected for the life of J.K. Rowling plus 70 years.
Regarding the 1938 novel by T.H. White: If copyright was renewed, it will enter the public domain in 2033. If copyright was not renewed, it is currently in the public domain. Regarding the 1963 Disney film: No.
When a copyright expires, the work enters the public domain. In the public domain, the work is no longer protected by copyright law, and anyone is free to use, reproduce, or modify it without permission or payment.
No. Due to frequent changes in the copyright law, no sound recordings will enter the public domain until February 15, 2067.
Materials can enter the public domain when copyright term expires, protection is not renewed (renewals are not available for new works), the creator donates the work to the public domain, or the materials are a work of the US Government.
The original novel will enter the public domain January 1, 2043. Films and other adaptations may still be protected at that time.