I thought of that at one point, but could find no way of
proving the paper book purchase had been made.
Let me think on this again.
See the companion site to the first Jeni Tennison book where it tortures
you to go any further with the online version with random questions:
"OK, what's at the bottom of page 163?"
That is rather self-defeating for an online version (really annoying to
answer such questions twice), but would be tolerable for a one time
download.
Max
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