INteresting...How to Electronically Sign PDF Documents Without Printing and Scanning Them

[Elrod]

You’ve been emailed a document, and you have to sign it and send it back. You could print out the document, sign it, and then scan it back in and email it. But there’s a better, faster way.

We’ll show you how to quickly add your signature to any PDF document, saving it as a standard PDF file that can be read anywhere. You can do this on Windows, Mac, iPad, iPhone, Android, Chrome OS, Linux—whatever platform you prefer.

http://www.howtogeek.com/164668/how-to-electronically-sign-documents-without-printing-and-scanning-them/

[Crank]

Foxit Reader also allows .pdf signing and its free.

[grmy2h]

Just make sure the one you choose is IRS compliant. Some are not.  

https://www.irs.gov/uac/new-electronic-signature-guidance-for-the-irs-efile-signature-authorization