title: Generate and sign PDF with digital signature that has date and time
body: <p>I am new to adding digital signatures to PDF documents. So please feel free to correct me if some of my terminology and assumptions are wrong. I have only recently started reading up on this and need to get up to speed soon.</p>
  
  <p>I have just started a new project (In MS MVC/asp.net) where I need to generate a legal document and then affix what my stake holders are calling a "digital signature" but from what they describe I think it is just a visible picture of a signature that is being added to a PDF and saved somewhere. I don't think this has the level of legal validity that it should however. It probably does not matter so much now, since the official record will be a printout of the document. But we want to move toward digital storage so I need something workable going forward.</p>
  
  <p>My understanding of actual digit signatures are that you encrypt the document and then add a digital signature to the encrypted hash. However, this digital signature is not visible on the document unless such an image is added as well to represent it. Is this correct?</p>
  
  <p>Can someone please suggest a good tutorial for this? I need to be able to add an official digital signature as well as a visible signature.</p>