There should be a way to create digital signatures from within Vault that would write directly to the drawing files. Currently if I want a "legal" signature I need to print a hard copy to sign which then becomes the legal copy on file (not the DWG) or I need to publish a PDF and use Verisign which then means the PDF becaomes the legal copy.
It makes sense to me to have all this done directly from Vault (ideally PLM 360 as well).
This is a very important point for regulated industries i.e. FAA, FDA etc.