secured PDFs

[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