How to disable signature prompt for third-party provider in Microsoft Word?

Question

In Microsoft Word if you click on Insert> SignatureLine, you will see this message:

We provided our client the ability to sign their document via certificates automatically genereated using our Microsoft Root CA and pushed to the client via group policy. When they try to sign the document they get prompted for third-party digital signature services from office marketplace. Since we have already provided them the certificates they need we would like to prevent them from seeing this prompt.

We have reviewed the document published by Microsoft, For IT professionals: Group Policy for Microsoft Office 2010 but have not found any settings that would allow us to not show this message.

Is there anyway way through group policy to automatically check the Don't show this message box so that the users is never prompted with this option?

Answer 1

I figured out that when you tick the Don't show this message again box, and click Ok, this action generate new registry key.

This is the path in registery: HKCU\Software\Microsoft\office\14\Common\Signature\SignatureUISettings

The key is REG_DWORD and the value is 448( in Decimal).

Basically if you make this register key and push it by GPO to the users, they never get that message that we had issue with.

If you want to test it, you can just make this regkey, and then delete it to see the diiferent.