Google cannot know if you have the rights for any possible document. If you have a whole book it could be bought from Amazon or downloaded via Torrent. There c

Google cannot know if you have the rights for any possible document. If you have a whole book it could be bought from Amazon or downloaded via Torrent. There can even be the case where you have private conteacts that give you rights that Google cannot know. I can inly thing that they will look for the low hanging fruit: a folder full of movies, music, and other content.