Re: PDF is blocked for printing, etc. OK for acroread (it behaves as expected), but KPDF allows me to print it, even if it is protected! Why?

[Gunnar Wolf <gwolf@gwolf.org>]

Merciadri Luca dijo [Tue, Apr 20, 2010 at 02:00:13PM +0200]:
> > As you quote, others have told you the PDF-provided security is
> > fake. It is just a flag flipped to tell the reader program to pretty
> > please make life miserable for the user.
> >   
> Yes, but it is often sufficient to prevent _beginners_ from hacking the
> whole stuff.

Yet, you say in your previous reply they would be able to remove the
watermark from the document. That is clearly more complicated.

> > Whatever can be displayed on screen can be captured (i.e. with the
> > common "PrtScr" keybinding in many environments). If you want to
> > distribute material and make it hellish to your users to print it,
> > copy from it or use it in any useful way, why don't you send the
> > document as a .jpg file?
> >   
> With such files (.jpg ones) they can print it directly, can't they?

If you distribute an image file in such a fashion it can be read on
screen but lacks enough resolution to be good for printing, fewer
people will print it. Of course, depends on what you want to achieve,
on the nature of the document.

-- 
Gunnar Wolf • gwolf@gwolf.org • (+52-55)5623-0154 / 1451-2244