On Fri, Jun 7, 2013 at 3:15 PM, Roger Wright <[email protected]> wrote: > ... just concerned about preventing editing or > copying and want to avoid passwords on either end if possible.
Use digital signatures[1] to sign the PDF. Integrity verification is built-in to Acrobat for that. You can also set options to say "No editing", "No printing", etc., although not all products honor those flags. And nothing can prevent someone from printing out the document, scanning it back in, and then doing something evil to the scanned image. Acrobat can generate a self-signed certificate, but since you'll be distributing this, I'd recommend obtaining certificate(s) from a Certificate Authority trusted by Acrobat by default. -- Ben [1] Meaning, "cryptographic message digest, authenticated by public key infrastructure", not "scanned image of a handwritten signature".
