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About "Hackers" as opposed to "Crackers" (an old distinction, which the book continues to make, correctly in my view even though the battle over terminology is lost). Crackers are about breaking into systems (what most people would descibe as hacking), hackers more about hacking (in a good way) systems together. The "updated material" mentioned in the blurb is less in-depth than the old-school stuff IIRC.