[pdftex] pdftex-pdfcrypt update

Hans Hagen pragma at wxs.nl
Wed Mar 28 18:08:25 CEST 2001

At 05:22 PM 3/28/01 +0100, Heiko Oberdiek wrote:


>But it is a hard job to do it in pdfTeX, because pdfTeX
>provides low level features, where pdf code is directly
>inserted. So _all_ insertions (by \pdfobj, \pdfstartlink, ...)
>have to be scanned to detect strings and streams in order
>to encrypt them.
>For example two test files, that are currently not encrypted
>in a correct way:


it may be enough to encrypt compressed streams only (i.e. text and
graphical data), since encripting any dict or descriptive object is a
slowdown and not that useful. 

                                  Hans Hagen | PRAGMA ADE | pragma at wxs.nl
                      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

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