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On 12/8/06, Roberto Ierusalimschy <> wrote:
- The obvious question: how can we avoid/reduce illegal proliferation
of copies?

-- Roberto

An interesting approach is taken by "Pragmatic Programmers" (Dave
Thomas & Andy Hunt) of Programming Ruby and Agile Web Programming with
Ruby on Rails fame.

They sell *personalized* PDF files of their books. For each customer
they generate unique PDF file with the name of that customer displayed
on every page footer (name is checked against the credit card). Of
course, if someone steals your credit card, orders PDF file and then
posts it on the web, a poor victim of identity theft is royally

But despite these shortcomings, this model works for them thus far.