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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