Tools that prove something true about a document, on your own hardware.
Information from Documents makes tools that prove something true about a PDF. Three rules, never broken:
Any proposal that breaks one of the three is not ours, whatever it would pay.
Text often survives under the black boxes in a redacted PDF. Nobody checks, because checking by hand means opening every file. A check is only worth having if anyone can re-run it and get the same answer. The tool is a local binary that reads the redacted file and writes a certificate stating what it checked and what it found. It is in development. If you want to try it on your own files, write to peter@docs2info.com.