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theory
Allowing a buyer to purchase a file for any computer but locking it to a computer after purchase allows selling flexibility while protecting publishers' content.
Internet content distributor ibooks.com
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Ibooks.com hosts professional reference books. Prospective buyers can search documents (stored in an enhanced version of HTML) for free; but when content is found, content that is not directly relevant is masked. Content is sold in units of one book at a time.
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