Re: [DIYbio] Removing watermarks from pdfs (pdfparanoia)

Ah. If one is worried about ultra-sneaky stenographic watermarks, one
could always use the same stenographic techniques to "hide" /dev/urandom
in each image? Encoding white noise over all the "spare" bits in the image?

Of course, converting from bitmap to lossy-compressed jpeg would also
probably eliminate stenographic watermarking.

On 06/02/13 18:31, Bjonnh wrote:
>> It's bloated and ugly, but it's only going to have the sort of watermark
>> that you can see with your naked eye; very easy to see if something is
>> slipping through your net!
> Not exactly, take a look at steganography techniques like this one : https://en.wikipedia.org/wiki/Steganography#Digital
>

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