With today’s mobile and geographically dispersed teams, subscription-based eSignature platforms like Adobe EchoSign and DocuSign are more secure and sane options for sending documents for signoff than emailing PDF documents, having the recipient print them out, sign them in ink, scan the document to PDF again, and then send them back to the sender. Take one of these eSignature platforms a step further and integrate it into a CRM or document workflow, and documents can be sent securely to multiple mobile users who can sign off the documents from their iPhone.

via Three free apps for securely signing documents with your iPhone | TechRepublic.