But that does not mean that every movie ever made and every book ever written has been "copied." I have never read the Book of magic by Neil Gaiman, but I am sure any similarities to Harry Potter are either coincidental or inspiration, not plagiarism.
Besides, if Harry Potter rips off any book, it's "Grossham Gange" by Anthony Horowitz.
A Scotsman journalist who had noticed the similarities between Neil Gaiman's Tim Hunter character and JK Rowling's Harry Potter was the one who first reported this story. It doesnt mean that JK Rowling had copied Harry Potter from the Book of Magic. Many writers had created a young magician with potential, and not just Neil Gaiman. It is the idea that matters
All good literature (and art, for that matter) draws on the influences of historic and contemporary masters. While the Harry Potter series and Neil Gaiman's work might share some themes and elements, I think it is extremely misleading to say that J.K. Rowling's work is somehow "copied," and therefore, unoriginal.
Harry Potter was not copied from a previously written book by Neil Gaiman, titled, The Books of Magic. This may simply be an attempt for a cynical mind to capitalize on the success of another author. It would certainly not be the first time this type of dispute has ever happened.
Great ideas that result in success have many parents. There was an episode on an old television show called "Cheers" where the local know-it-all ends up going on Jeopardy. There was a writer who pitched the idea in a spec script where the character went on Jeopardy, but the producers were already working on a script with that very idea. It was an obvious, terrific idea. No doubt the same thing happened with the Harry Potter series. Some ideas are sitting there ready to be used and people experience the idea at the same time. It doesn't mean that one copied from another. It just means that if you have a great idea, you need to jump on it immediately and produce the best results with it.