Provided the person returns the original book to you (or it is completely destroyed), and keeps no copy of the scanned book for himself -- it falls under fair use.
Barring any other example off the top of my head, companies have been doing this for years to make unusual books available in Braille. As long as you have a purchased copy of the book, they will convert it for you and send it back with directions that you cannot redistribute.
The copyright notices in the front of the books generally refer to copying the book for means of redistribution. Those that DO specifically mention not copying or storing in electronic file system (etc.) in any manner are not tested legally yet to my knowledge -- and it could be easily argued that turning the paper book into a personal-use digital copy falls under access to content exclusions from copy prohibition.
All in all I may not want to be the one advertising the service, but I would be confident using such a service.
|