That was my initial thought too. For some important authors, there are a few high quality scans of their manuscripts, so with a tool like this you could create

That was my initial thought too. For some important authors, there are a few high quality scans of their manuscripts, so with a tool like this you could create fake manuscripts -- and in a few years, after they are dead, say that you find them, create provenance, and boom, unpublished novel by JK Rowl- any author.