as I and Shmuel Wolfson pointed out: The password "security" is not secure at all. I apologize, but your clients require something that cannot be achieved. About the certificate: Given an original PDF with certificate, any later change would be displayed -- so any reader could see that the file is not the original file. On the other hand, of course it is not possible for external users/readers to distinguish a fake PDF with a false certificate or with no certificate at all from an original one. First, he/she would have to know that our company uses a certificate, and second the way a certificate looks like can be reproduced by anyone. Only our staff could find out if the PDF is a fake (with certificate password check), e.g. if necessary to initiate legal measures. At the moment, I do not see any way to prevent fake PDFs, although I would be fond of knowing one. Best regards - Tino H. Haida Carol J. Elkins: > At 11:00 AM 3/4/2015, you wrote: > >> We are using the certificate security for our manuals instead, which will >> make sure that any unauthorized change could be detected. > > Heiko, from the little I know about PDF certificate security, you must be > able to identify every user of the PDF. My clients sell PDF versions of their > books via CD on open ecommerce and I have found no good way to secure those > PDFs other than the very vulnerable password protection. Do you happen to > know if certificate security can be used in situations where a PDF is burned > to CD and the CDs mass-produced? My clients require secure PDFs to prevent > modifying them and also to prevent companies from copying the content and > rebranding it as their own. > > Carol > > _______________________________________________
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