I.R.I.S. Readiris 14 for Windows User Guide - Manual (Page 123)

Section 9: Saving Documents
130
Note that in Readiris the open document password and permissions
password must be different.
D
IGITALLY
S
IGNING
PDF D
OCUMENTS
(This section applies to Readiris Corporate only)
The PDF documents you generate with Readiris can be digitally
signed. Digital signatures identify the person who created the PDF
documents; they authenticate the identity of the author, certify a
document and help prevent unwanted changes to PDF documents.
Note, however, that Readiris does not generate digital signatures.
You need to have a digital signature at your disposal to generate
signed documents with Readiris. You can create digital signatures
with Adobe Acrobat or obtain them from companies like VeriSign.
To generate digitally signed documents:

Click the Format button on the main toolbar.

Select the required PDF type from the drop-down list.

Click the Signature tab to access the signing options.

Select Use this signature then browse for the signature of your
choice.