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
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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