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If it is no longer protected by copyright, there are no rights to obtain.
Business names are not copyrightable; they can be registered as trademarks.
The copyright lasped on the death of David Selznick, but later it was renewed in the USA. It will remain under copyright there until 2045.
The book will be protected through 2055, and the film through 2057, barring any additional term extensions.
Drugs and other pharmaceuticals are protected under the patent laws not under the copyright laws.
Trademark yes copyright no.
Public domain is the body of works no longer protected by copyright, which can be freely used by anyone for anything and it will not violate copyright law. However, some types of works include other rights such as trademarks or recognizable images of living individuals, which could be restricted under other laws.
If a song is no longer under copyright, then it becomes public domain. Typically that means that the lyrics are no longer protected. Other people can use them for whatever reasons, commercial or otherwise, without needing to seek permission, licensing, or pay royalties. That does not mean you can use someone else's cover of that song, which will be protected as a derivative work. As an example, many Christmas carols were written a few hundred years ago, and their lyrics are no longer copyrighted. So you could do your own cover of 'I Saw Three Ships', publish and sell it, etc. But what you could not do is use someone else's cover, such as the one featured in a 1999 episode of South Park, which is protected by its own copyright until at least 2069, if not longer. You could not incorporate this version into a new work until then. There are also different rules for copyright of the song and copyright of a recording made of a performance of the song. Each recorded performance may have completely different copyright owners and duration.
Yes, "Reluctance" by Robert Frost is in the public domain as it was published before 1923, which means it is no longer under copyright protection. You are free to use and share it without seeking permission.
Yes. All aspects of the film are still under copyright.
You need permission from the copyright holder or an exemption in the law.
A website is considered a "literary work" under copyright law.