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Originally Posted by Nate the great
One, that's not a barcode. It's a serial number. One is an image while the other is text. Okay, that is really a po-tay-toe po-tah-toe difference but I am feeling nitpicky today.
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It is a barcode. It's in there, in form of a
Base64-encoded string.
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Other pages in the book all have the same image at the bottom that is nearly impossible to notice with your naked eye. The image is embedded as a Based64 encoded string (see the image depicted above), decoding (using the openssl base64 command) it results in an image with the dimensions of 1 by a few hundred pixels. When seen with a naked eye it looks like a thin white line. If you use the eyedropper tool to inspect the image you will see that it consists of bars of variable widths in two different colors: white (#FFFFFF) and a little bit less white (#FEFEFE). When you replace either of the colors with black and enlarge the image vertically by 100 pixels you will see an image of a barcode similar to the one depicted below.
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Also why would anyone wonder what a digital watermark looked like?
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Curiosity?