On Tue, Feb 17, 2009 at 5:12 AM, Michal Hocko <[email protected]> wrote:
> >
> > I'm also curious if there are any convenient ways to securely redact
> parts
> > of a PDF without rasterizing the text.
>
> I am not sure what do you mean by that? Example?
>
Here's an example of a heavily redacted document -
http://www.webspores.com/wordpress/wp-content/uploads/aclu-v-ashcroft-redacted.jpg
Even old-fashioned marking pens can leak information through redaction -
http://cryptome.info/0001/cia-decrypt.htm
PDF makes it easier to get redaction wrong.
Most methods for redacting PDF are along the lines of converting to TIFF,
redacting, converting the TIFF image back to PDF. So much useful information
is thrown away doing it that way. To convert back to text you'd need to OCR
it.
Thanks.
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