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Originally Posted by crossi
Audible files would seem to be more complex with more places you could hide watermarks without them being detected. Converting to a straight text file, not HTML, would seem a better bet for removing watermarks. Is there anyplace in a notepad file that a watermark could be hidden without changing the text?
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Just choose 20 places in a plain text file that can hold a different character and you can encode binary number with 20 digits - numbers between 1 and 1048575 (1024*1024). Enough to identify an individual buyer plus a few bits for checksum.
You can use a non-breaking space versus ordinary space, you can use a space after a coma at the end of the paragraph, you can use Unicode typographical equivalent of some ordinary character, you can use a non-printable character. You can even alter the text and introduce tiny errors.
When it comes into html, there are lots of places to hide something in the plain sight. Like whitespace or newline characters or letter capitalization within html tags, or naming system for css elements.
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Originally Posted by NonDuality
Also, found this interesting line on A.Alf's blog -
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Once the DRM has been removed, is there any trace of my personal identity left in the ebook?
The tools only remove the DRM. No attempt is made to remove any personally identifying information.
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Is he implying that there is personal info in DRM'ed ebook files? Not quite clear. |
He is implying that he is not trying to look for personal info.
Nobody really knows whether some publisher decided a week ago to start including some hidden info or not. Stenographic, hidden in plain sight as described above, or in a tag somewhere. or in a name of included file perhaps.