On Fri, 19 Jun 2026, Russell Senior wrote:
If you want to authenticate your version, you might just distribute a sha256sum with your PDF.
Russell, I doubt anyone would know what to do.
You can't really stop someone from creating a modified facsimile that looks (mostly) the same. They could print it, paste text on top of yours and scan it back into a new PDF.
It appears that qpdf can do this so I asked on stackoverflow.com. Thanks, Rich
