[Perseids]

Something I was always curious about since I first found out about this trick: Why did the book not contain some error correcting codes at the bottom of each page to simplify the scanning process? Would it have somehow lessened the legal protection of Zimmerman's free speech?

[rdl]

I think later versions did.

[cyber]

Yes, the first book set was to test the "bandsaw" protocol and getting it back into electronic format.

IIRC, they also tweaked the font for better OCR.