See http://en.wikipedia.org/wiki/Ransomware http://en.wikipedia.org/wiki/Ransomware … or far more entertainingly, http://en.wikipedia.org/wiki/Reamde http://en.

See http://en.wikipedia.org/wiki/Ransomware http://en.wikipedia.org/wiki/Ransomware … or far more entertainingly, http://en.wikipedia.org/wiki/Reamde http://en.wikipedia.org/wiki/Reamde (read the novel, not the Wikipedia page)