When you open a digitally signed form in Microsoft Office InfoPath 2003, you see the following error message where the digital signature should be:
There is a problem with this signature.
You cannot determine who digitally signed the form unless you click View details. If you click View details, you will see the name of the person who digitally signed the form. Additionally, you receive the following error message:
Apply the InfoPath 2003 post-Service Pack 3 hotfix package: December 17, 2007.
How to obtain the hotfix
This issue is fixed in the InfoPath 2003 post-Service Pack 3 Hotfix Package that was released on December 17, 2007. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
Check whether the problem is fixed by verifying that the digital signature appears. If the digital signature appears, you are finished with this article. If the problem is not fixed, you can contact support