We avoid PDFs for our subscription publications. We produced a reader that
is available as an on-line product or a standalone Windows program (CD, USB
Stick, or Download) that provides subscription licenses to be purchased for
the publications in the library.  We can also control expiration dates,
automatic content updates and add our own bells and whistles.

It's html based and use's a compressed Lucene index so user's can still
copy content page by page but the cleanup and reuse would be a pain.  The
main feature is user's can't just send or install the program on another PC
and have it function like a PDF would.  For our print editions we run the
source XML into Frame to produce the PDFs for commercial printing.

Ed Nodland

On Thu, Mar 5, 2015 at 10:14 AM, Carol J. Elkins <celk...@awrittenword.com>
wrote:

> 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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