Books are protected for the life of the author plus 50 years in most countries; the US and some others have extended this to life plus 70 years.
The popularity of the book is unrelated to the term of copyright protection.
Her best selling book is "And Then There Were None"
The Bible is the best selling book ever.
Agatha Christie's best selling book was 'And Then There Were None.'
The best selling book in the world is Precious Hearts Romances.
The best selling book of 2012 was Fifty Shades of Grey.
In 1944, the best-selling book was "Strange Fruit" by Lillian Smith.
All of her books are best selling.
The runaway is the best selling book in 1996
Selling an ebook after reading it may violate copyright laws if you do not have permission to resell it. Check the terms and conditions of the ebook platform you purchased from, as well as the publisher's policy on reselling digital content.
Best-SELLING book ever.
The second best-selling book in 1976 was "The Thorn Birds" by Colleen McCullough.
Typically no; there may be seemingly minor changes to the edition. However under current copyright law, duration of protection is based on the year the creator died, not the year the book was published.