On Fri, Jun 7, 2013 at 4:42 PM, Ben Scott <[email protected]> wrote: > 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.
P.S.: To clarify: Preventing copying of digital content is extremely difficult. For files distributed via open email, it's basically impossible. To do anything at all, you'd need to convince all your customers to install proprietary add-on software, and deal with the support burden and incompatibilities. Digital signatures will prevent modification, and will prevent re-purposing of the signature for other documents. -- Ben
