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:
This digital signature has expired.
Steps to solve this problem
To fix this problem, follow these steps:
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:
946535 Description of the InfoPath 2003 post-Service Pack 3 hotfix package: December 17, 2007
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:
322756 How to back up and restore the registry in Windows
To enable this hotfix, follow these steps:
Click Start, click Run, type regedit, and then click OK.
After you click the key that is specified in step 3, point to New on the Edit menu, and then click DWORD Value.
Type AllowExpiredCertOnXmlValidate, and then press ENTER.
Right-click AllowExpiredCertOnXmlValidate, and then click Modify.
In the Value data box, type 1, and then click OK.
On the File menu, click Exit to exit Registry Editor.
Did this fix the problem?
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.