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I looked a bit more at Karamel. It works very differently from the old KCR renderer.
Previously book content was sent to KCR as HTML which was selectively rendered by the KCR JavaScript program running on the user’s browser. With Karamel each screen full of content is rendered by the servers at Amazon and delivered to the browser as a jpeg image. That slows things down significantly, but is far more secure since OCR is the only way to obtain the book’s original content.
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