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On Tue, 20 May 2008, Joseph Stewart wrote:
>
> 1. PDF with embedded unique serial number per purchaser

That's what the Pragmatic Programmers do for the electronic editions of
their books.

> 2. PayPal.

:-(

Tony.
-- 
f.anthony.n.finch  <dot@dotat.at>  http://dotat.at/
SHANNON ROCKALL: SOUTHEASTERLY 5 TO 7, OCCASIONALLY GALE 8 AT FIRST. ROUGH OR
VERY ROUGH DECREASING MODERATE OR ROUGH. SQUALLY SHOWERS. MODERATE OR GOOD,
OCCASIONALLY POOR.