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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Password required on document that opens without using Acrobat"
href="https://bugs.freedesktop.org/show_bug.cgi?id=70704#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Password required on document that opens without using Acrobat"
href="https://bugs.freedesktop.org/show_bug.cgi?id=70704">bug 70704</a>
from <span class="vcard"><a class="email" href="mailto:cloos@jhcloos.com" title="James Cloos <cloos@jhcloos.com>"> <span class="fn">James Cloos</span></a>
</span></b>
<pre>Interesting.
GhostScript also is unable to open it, but mupdf can do so.
The mupdf src has this comment about /R 6:
/*
* Compute an encryption key (PDF 1.7 ExtensionLevel 8 algorithm)
*
* Adobe has not yet released the details, so the algorithm reference is:
*
<a href="http://esec-lab.sogeti.com/post/The-undocumented-password-validation-algorithm-of-Adobe-Reader-X">http://esec-lab.sogeti.com/post/The-undocumented-password-validation-algorithm-of-Adobe-Reader-X</a>
*/
That will be needed to handle this document.
-JimC</pre>
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