[ILUG] PDF protection.

[Paolo Marchiori]

jason corcoran, Tue, Feb 28, 2006 at 03:24:04PM +0000:
> I have a pdf file that someone has put drm protection on to stop it being edited.

PDFs have two level of protection, both unlockable with a password. The
first level (the "user password") permits the PDF to be read, printed or
compiled (it a form). The second level allow more pasturating with the PDF,
editing included.

The first idea that comes to mind is bruteforcing the PDF. You need a fast
machine, a dictionary, a bruteforcing tool and pdftk. Read the man page for it.

Or, if you like closed proprietary software, try verypdf's pwdremover and
elcomsoft (do the words "Dimitri Sklyarov" ring a bell?) password recovery
tools.

p.
-- 
pbm - "But something happened - don't know if I can explain it
       just call me the man whose heart turned to stone"