Dave Novo

In as much as if you saw my signature on any piece of paper, like credit card receipt, then stole my checkbook, then scanned both together and issued forged checks, you could try to do so I guess. This somehow embeds a real certificate of some sort into your document. Here is a bit of an overview of what they are doing, but it is light on technical details https://helpx.adobe.com/acrobat/11/using/digital-ids.html I think there is an open standard that governs these kinds of digital signatures.