I recently udpated to Adobe Reader 11.0.7 and now I can not open signature protected documents. ?Porque? What is the fix?

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Answer 1

Pasting all the conversation so that others can get help from the discussion.
Hi David,
Can you please try disabling protected mode and see if you are able to open these files.
To disable protected mode:
Select Edit menu -> Preferences -> Ubcheck Enable Protected Mode at startup and restart Adobe Reader.
Note:
"Purpose of Reader XI Protected Mode is to keep your system safe from PDF based exploits and keeping protected mode OFF will leave your system vulnerable.”
Please turn back on the protected mode checkup after this testing.
This seems to be a fix!  Thank you for your help.  Now comes the tricky part.    I have to deploy this as a package across a gov. network using SCCM.  How do I get this to all the users with "enable protected mode..." unchecked.  I can't give them something that does not work out of the box.
Hi David,
It is not advisable to turn off protected mode as Purpose of Reader XI Protected Mode is to keep your system safe from PDF based exploits and keeping protected mode OFF will leave your system vulnerable.
Please let me know few details so that I can reproduce the issue at my end.
1) Will it be possible for you to send any test file in which the issue is reproducible.
2) Can you please check where the certificate (from which the PDF is signed) is stored. (Is it stored at Trusted Root Certificate Authorities or some other store?)
3) Do you use any other tool other than Adobe Reader plugin to digitally sign/ open a PDF ? (Is any tool other than Adobe Reader is involved?)
Thanks,
Shakti K
Hi David,
Please do the below test to see if the issue occurs due to signatures applied to the PDF document.
1) Launch Reader go to Edit -> Preferences -> Security (Enhanced) and check "Enable Protected Mode at startup" and clock OK.
2) Goto Edit -> Preferences -> Signatures and select Verification . Uncheck "verify signatures when the document is opened." and click OK.
3) Restart Adobe Reader
4) Now open the digitally signed protected PDF file in which the issue was observed.
Please let mw know the observation.
Thanks,
Shakti K
It has nothing to do with the signatures applied.  Any document with a
signature block, even blank documents, will not open unless the "enable
protected documents at start up" is unchecked.  It is the same across the
board for all documents weather signed or unsigned with a signature block.  I
have it working on my machine, I just need to figure out how to install over
the  network with the block unchecked during installation.
1.  Attached form
2.  I am not sure where reader pulls the cert from.  They are all in a trusted
root CA because all certs are miiitary
3.  Other tools used
ActivClient CAC x64  (6.2)
e-Sign Desktop 6.6
Thanks again for the support
Thanks a lot for all the information.
A doubt : If the document is not signed (like you mentioned unsigned documents also face the same issue) then how exactly the document is protected. Is it protected using any certificate?
I cannot find any attached PDF form . Please resend it again.
I am unable to reproduce the error now.  Even with the protected block check.
Im not sure if there was a Group Policy change that enabled this.  As of now,
it looks like the issue has been resolved.  I appreciate all the help.