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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.

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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.
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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
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