Adding "Trusted Publishers" certificate with Group Policy

Reference:
http://www.bibble-it.com/2008/09/03/adding-trusted-publishers-certificate-with-group-policy

• export Certificate without private key. (ex. mykey.cer)
• Open “Group Policy Manager”
• Under Computer Configuration – Windows Settings – Security Settings – Software Restriction Policies
• Right click and create a new Software Restriction policy if you haven’t got one already

• Under Additional rules right click and create new “Certificate rule”
• Click browse and select the exported certificate that is being used to sign the updates (.cer file)
• Change the “Security Level” to Unrestricted otherwise you will stop the computers running any programs!