If it can be displayed on a computer screen it can be copied, qpdf or no qpdf.
Ted -----Original Message----- From: PLUG <[email protected]> On Behalf Of Rich Shepard Sent: Friday, June 19, 2026 9:39 AM To: Portland Linux/Unix Group <[email protected]> Subject: Re: [PLUG] Preventing a PDF documement from being modified 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
