It takes the embedded font out of your PDF, and then maps non-latin characters (japanese, cyrillic, etc) to render as if they looked like a latin character. So in the example on the site. "ӕ" will render as a "D" using my special font. And "ㅈ" will draw the "B" glyph. Then I do a replacement on the underlying text so all "B" are replaced with "ㅈ". It is more complicated than that, but that's the gist.
So basically it's a type of Caesar cipher where letters are mapped to something else one-to-one. Very easy to decrypt / reverse. If this tool ever became popular there would be hundreds of scripts to defeat it.
And as it is, it does not prevent "OCR", only copy-paste.
viggity|3 years ago
bambax|3 years ago
And as it is, it does not prevent "OCR", only copy-paste.