Vulnerability Development mailing list archives

RE: PDF modifications?


From: "Dawes, Rogan (ZA - Johannesburg)" <rdawes () deloitte co za>
Date: Fri, 17 May 2002 17:02:50 +0200

My mistake. See http://www.foolabs.com/xpdf/cracking.html

But, nonetheless, it is simple to make the mods, I'm sure.

Rogan

-----Original Message-----
From: Valdis.Kletnieks () vt edu [mailto:Valdis.Kletnieks () vt edu]
Sent: 17 May 2002 02:51
To: Dawes, Rogan (ZA - Johannesburg)
Cc: 'Sumit Dhar'; Kurt Seifried; bad bob; vuln-dev
Subject: Re: PDF modifications? 


On Fri, 17 May 2002 08:14:18 +0200, "Dawes, Rogan (ZA - 
Johannesburg)" said:

If the PDF is openable and viewable, but is "protected", so 
that you can't
select or print or annotate, that is easily bypassed with almost any
non-Adobe PDF viewer, such as xpdf, which simply elects not 
to honour that
setting in the PDF. The data is all there, because you can 
view it, it is
simply a case of the software choosing to not let you 
select it. Find some
software that doesn't honour those document settings, and 
you are on your
way.

As I recall, there was some discussion about this issue on 
the xpdf lists,
or somewhere, about whether xpdf should honour the document 
requests or not,
but it is really moot, since the source is there, just 
modify it to suit. I
think that was the conclusion by the xpdf developers, so 
they simply didn't
bother honouring the setting.

This must have been pre-DMCA. I would recommend that the xpdf
developers not visit the US, lest they be Skylarov'ed.

(The vuln-dev connection?  Consider why Alan Cox censored a 
Linux kernel
changelog - but further discussion should probably be moved 
to a political
list.  If you're in the US and of voting age, contact your 
Congresscreature
and tell them you want them to support Rep. Rick Boucher (D-VA) in his
attempts to fix the anti-circumvention clause of the DMCA).

We now return you to your regularly scheduled vuln-dev 
discussion, which
may be in violation of the anti-circumvention clause....
-- 
                              Valdis Kletnieks
                              Computer Systems Senior Engineer
                              Virginia Tech





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