"When we exported 5,000 pages of PGP source code in a book through MIT Press in the 90s, we ran into some issues.

It turns out it's very hard to scan C source code via OCR. So what did we do? We wrote software that was specifically designed for OCR scanning of C source code and published it at the beginning of the book as a bootstrapping mechanism.

It was shortly after this point that I received word that the intelligence agencies had realized they had lost."

- Phil Zimmermann