Leo says that an OCR (optical character recognition) program with a scanner will work. This will translate the documents into plain text that can be edited on the computer. Here's some OCR software options:
- Nuance OmniPage
This is an online OCR with a limit of 10 pages an hour.
This is an open source version. May be a little difficult to use, but it's free.
This has a free 15 day trial.
This is probably his best bet, but it'll cost $150. It is on sale right now for $55 at Amazon, though.