AH Formatter & Digital Signature

Antenna House does not offer a digital signature module, but recommend that customers look at some of the open source programs available that have similar functionality and can be used to add signatures to the Formatter generated PDFs.
JSignPdf (http://jsignpdf.sourceforge.net/), for example, is very easy to use and is cross-platform as well. There's also a list maintained at http://wiki.cacert.org/PdfSigning that has some other options.