I'm struggling to understand the circumstance you'd plagiarize fiction - you can literally write anything you want. Why steal someone else's writing and slap it in your book? It'll either stand out and be weird / stilted or you took the time to make it work somehow in which case you probably rewrote it and so why steal in the first place? Or like use allegory instead?
Obviously it shouldn't be done in any circumstance
Instead of slapping Harry Potter in the middle of your book wholesale, imagine you lifted a few really good lines from Harry Potter, a few from Lord of the Rings, and more from a handful of other books.
Read the evidence document another poster linked for actual examples.
To me as a dumb reader, that would be fine, maybe the author could have mentioned that he likes these authors and takes them as inspirations. Also you can't really forbid books to never have references to pop culture. And at some level of famous-ness passages and ideas loose their exclusive tie to the original book and become part of the list of common cultural sayings.
Well plagiarism by definition means passing the work off as your own without crediting the author, so in that case it isn’t plagiarism.
References to pop culture are the same as lifting sentences from other books and pretending you wrote them.
> And at some level of famous-ness passages and ideas loose their exclusive tie to the original book and become part of the list of common cultural sayings
In the actual case being examined the copied references certainly hadn’t reached any such level of famousness.
Also there’s a difference between having a character tell another “not all those who wander are lost” as a clear reference to a famous quote from LOTR and copying multiple paragraph length deep cuts to pass off as your own work.
> Well plagiarism by definition means passing the work off as your own without crediting the author, so in that case it isn’t plagiarism.
Of course, but wrote 'could' and not 'should' for a reason, I won't expect it. A book isn't a paper and the general expectation is that the book will be interesting or fun to read and not that it is original. That means the general expectation is not that it is never a rehash of existing ideas. I think ever book including all the good ones is. A book that invents the world from scratch might be novel, but unlikely what people want to read.
> copying multiple paragraph length deep cuts to pass off as your own work.
If that is true, it sounds certainly fishy, but that is a case of violation of copyright and intellectual property and not of plagiarism.