Is there a way to add digital signature to generated PDF report (crystal reports, fast reports, …)?
There’s no tool in Origam to do so. If the PDF file would be stored on file system, it could be processed by some tool invoked by OperatingSystemService.StartProcess.
The usual implentation of PDF signing seems to rely on third party tools: c# - Digitally sign PDF files - Stack Overflow.
IText Core could do it but it has an AGPL license, which is a bit more restrictive than the GPL we license ORIGAM with. So if someone chooses to develop this as a workflow service agent, it should be maintained as a separate project and not distributed by default.