Protecting PDF files

[Magnus Therning]

On Sun, Dec 11, 2005 at 09:02:48PM +0700, LinuxMurah.com wrote:
>dear friends,
>
>is there any way to protect pdf file so that cannot be copy 2 or 3
>times?? the main puropse is to protect e-book piracy.

Why not just read the PDF standard? I believe it's a publically
available standard.

My experience with digital restrictions, especially in PDF, is that it's
rubbish. Note, I'm only taling about it from a technological POV. AFAIK
all of it is enforced in the client. Since there are OSS clients (like
the brilliant evince) there is very little to gain by restricting what
people can do with a PDF document.

My suggestion to anyone who's thoughts start moving down the DRM path is
to add value on the side rather than restrict what your customers can
do.

Just my 2p.

/M

-- 
Magnus Therning                    (OpenPGP: 0xAB4DFBA4)
magnus at therning.org
http://therning.org/magnus

Software is not manufactured, it is something you write and publish.
Keep Europe free from software patents, we do not want censorship
by patent law on written works.

"Sendmail" and "make" are two well known programs that are pretty widely
regarded as being debugged into existence. That's why their command
languages are so poorly thought out and difficult to learn.  It's not
just you -- everyone finds them troublesome.
     -- Peter van der Linden, Expert C Programming, p. 220
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