Discover From This Page & Topic: [Discover] e-signatures
[Discover] Electronic Signature Software and Capture Pads http://www.topazsystems.com/index.htm
(topaz document vendors) 
[Discover] Adobe LiveCycle Document Security http://www.adobe.com/products/server/securityserver/ (drm security adobe)
[Discover] XML.com: An Introduction to XML Digital Signatures http://www.xml.com/pub/a/2001/08/08/xmldsig.html (xml tutorial webservices authentication)
[Discover] Electronic signature - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Electronic_signatures