The company I work for has a client that wants to be able to sign PDF's so that they, by default, show up in Adobe Acrobat as being digitally signed by an autorized cert provider. We have been doing some research and contacting companies and so far it seems the only solution is an expensive one that reuires purchasing a piece of hardware that can sign them. We do have a requirement to integrate the signing of PDF's into our own software so that it can be automated (a manual solution won't work).
I would appreciate if anyone has any advice on what we should look into regarding this. Thanks