The media are reporting

High Court judge Peter Smith rejected a copyright-infringement claim by Michael Baigent and Richard Leigh, authors of "The Holy Blood and the Holy Grail," who claimed that Brown's blockbuster "appropriated the architecture" of their 1982 book. In the United States, the book is titled, "Holy Blood, Holy Grail."

...

Smith said the plaintiffs had based their copying claim on a "selective number of facts and ideas artificially taken out of (the book) for the purpose of the litigation."

But perhaps the real purpose of the lawsuit was this?

Baigent and Leigh['s] ... 24-year-old book is selling 7,000 copies a week in Britain, compared with a few hundred before the case began. Baigent's new book, "The Jesus Papers: Exposing the Greatest Cover-Up in History," has an initial print run of 150,000 copies in the United States.