Dont wanna be annoying, but I found this comment under the one of Factom videos.

"Here's another easier way to secure the integrity of 29,000 books.
Create a torrent for each book, or a torrent that contains all the books, keep the .torrent, you'll have SHA1 hashes for each torrent, and you'll have the file pieces hashed as well. A .torrent file is a Factum used to validate the integrity of files transfered.

Then grab the .torrent hash and put it into a Bitcoin transaction.

You can create torrents of just about any data source, and add those torrent infohashes to the Bitcoin blockchain.

I still don't see why Factum is needed."

Can someone elaborate? Im not techie, but I guess simple solutions always win.