At 11:45 AM 8/14/2001 +0200, Giuseppe Bilotta wrote:
>This message is forwarded from the newsgroup "comp.text.tex".
>
>----------- Begin Forwarded Message -----------
>
>Subject: Re: Security settings with PDF files
>From: Heiko Oberdiek <[EMAIL PROTECTED]>
>Newsgroups: comp.text.tex
>
>On 13 Aug 2001 12:12:03 -0700, [EMAIL PROTECTED] (Raider) wrote:
>
> >I read the pdfTeX manual and found no refference on how can I restrict
> >access to the generated pdfs.
>
>You need the latest pdfTeX (1.00a-pretest) with enabled
>encryption support, see the pdfTeX mailing list for details:
> http://www.applications/pdftex/
>Package pdfcrypt provides a LaTeX interface and
>supports pdfTeX and VTeX.
So, actually you want to know if context supports pdftex encryption -)
Well, for the moment it does not, for several reasons:
(1) it's not part of standard pdftex (although thanh has now wrapped up
encryption in a propper primitive)
(2) it's not garanteed to work
(3) it's spread all over the pdftex code, which makes it hard to maintain
(4) encryption can best be combined with serializing in a dedicated program
[using xpdf lib]
(5) the encryption stuff interprets the object content which makes it
dangerous code
[ad 5: on the pdftex list there has been some discussion about this and my
suggestion was to *not* parse object content, but since the content would
come from a macro package, to provide an on/off feature. One obstacle seems
to be that hyperref has some hard coded stream sizes in macro code (kind of
hackery, sigh). The patch was written while thanh was busy with his thesis
so no real follow up took place.]
Last week at tug 2001 i discussed this with thanh. Since both encryption
and tiff inclusion can break pdftex output, these features will be options
that can be compiled in the code, but not defaults.
Maybe one of the programmers on this list sees it as an challenge to write
a dedicated program for encryption; shoul dbe not that hard if you use the
xpdf library.
Hans
-------------------------------------------------------------------------
Hans Hagen | PRAGMA ADE | [EMAIL PROTECTED]
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: +31 (0)38 477 53 69 | fax: +31 (0)38 477 53 74 | www.pragma-ade.com
-------------------------------------------------------------------------
