Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I'm trying to create a digital signature in a PDF document using Adobe Reader 9 for Mac OSX 10.5.8. When I click Document -> Sign, all the options are grayed out. How can I create a digital signature?

Thank you in advance.

share|improve this question

I would assume you have to create an ID first:

  1. Choose Document > Security Settings.
  2. Select Digital IDs, and click Add ID.
  3. Select Create A Self-Signed Digital ID For Use With Acrobat.
  4. Follow the on-screen instructions to set up the self-signed digital ID.
share|improve this answer
I try this, but the menu is still grayed out. I notice that when I go to File -> Properties, a field says "Signing: Not allowed." Do you have any ideas? – Jeffrey Nov 27 '10 at 2:32
@Jeffrey Where did you get the PDF? – digitxp Nov 27 '10 at 16:44
A company I am interviewing for wants me to digitally sign a form as part of my application. I still cannot get Adobe Reader to cooperate, however. How can I override the protection that Adobe Reader thinks is on the PDF and sign it? – Jeffrey Nov 27 '10 at 19:50
The best thing I can assume from what you've given me is that they put a password on the PDF so that signing is disabled. Is there a password on the thing (it should say under Document-> Security or whatever)? If so, you may want to remove it with this program. It's commandline, but it works. – digitxp Nov 28 '10 at 3:38
After building the cracker, it says that my pdf is not password protected, but I still cannot click on "sign" under Documents. – Jeffrey Nov 28 '10 at 5:13

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.