secured PDFs
Heiko Haida
info at heiko-haida.de
Thu Mar 5 11:07:35 PST 2015
Hi Carol,
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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