Everbody who wants this feature should also subscribe and vote for: http://feedback.telerik.com/Project/143/Feedback/Details/151016-add-digital-signature-to-pdf-on-exporting-in-radrichtextbox
Posted on:01 Feb 2016 18:54
And there are a lot of people since 2009 waiting for digital signatures!
But you can use an alternate solution until Telerik reacts: If you export your PDF to a memorystream you can sign it with this library: http://www.signfiles.com/signature-library/
Posted on:05 May 2016 09:43
Everybody who is interested in this item, could also be interested in this: http://feedback.telerik.com/Project/184/Feedback/Details/190792-support-digital-signature-pdf-in-exported-pdf
So go and vote for it!