When the movies began coming out in 2001, branding became more universal and unique fonts began switching over to a generic "Harry Potter" font for the covers of books. Pre-movie font books are considered as such because they had a unique font on the cover, but then after the movie release, were republished with the new font. To look at things more simply, a book like Danish was printed with a unique font, but after the movies, was released with the same cover art and then a new font.