"A few items that were originally claimed to have been copied from [Holy Blood, Holy Grail] have been dismissed because [Dan Brown's] lawyers can show ... wait for it ... he copied them from a different source, not HBHG. There was a hint that the copying was "textual" (word-for-word?) but that it was of very brief length.
Read more at The Da Vinci Crock and Writopia.
I read HBHG many years before TDC, and I immediately wondered how Dan Brown got away with it, and then there's another guy who wrote a book called The DaVinci Legacy who's suing him, too. It's pretty obvious that he took stuff from HBHG. But since it was a researched historical theory of sorts and Dan Brown maintains that TDC is purely fiction, I guess it's a blurry line. Plagarism is plagerism, though, so it'll be interesting to see how this plays out. TEAM... ROBERT LANGDON?