Cheque signature
I have a newer version of Word and I have not been able to modify the template so that the new signature file is selected when trying to preview. Originally followed instructions in note 312353.1, but have not had any luck at editing the location of the dummy "void" file to select the new signature.
The signature image can be secured quite simply by creating a dummy image in the template. You can then use the image substitution features of XML Publisher to have the image rendered at the time of document generation.