What did it mean to have multiple books under one book number?
A book number with multiple books usually referred to the situation where the same book number contained many different books at the same time. This situation was more common in novels, comics, light novels, and other works with relatively loose copyright management. It was usually because the author or copyright owner had many different books under the same book number, or because the publishing house needed to package and sell or publish the works of the same author. For example, a book number could register multiple novels at the same time. The copyright of each novel was independent, and the publishing house could publish them separately or package them together according to demand. In this case, the title, cover, author, and other information of each book may be different, but the content is usually the same. It should be noted that this situation may lead to copyright disputes because different books may have the same or similar content, so the author or copyright owner may need to negotiate and resolve the relevant issues themselves.
