14. The method of claim 11 , wherein an arbitrary digital representation comprises a digital image, the signer input comprises biometric data and altering the characteristic of the signature document comprises: applying a visual representation of the biometric data to a graphical representation of the signature document.
14. The method of claim 11 , wherein an arbitrary digital representation comprises a digital image, the signer input comprises biometric data and altering the characteristic of the signature document comprises: applying a visual representation of the biometric data to a graphical representation of the signature document. 15. The method of claim 14 , wherein the biometric data comprises a handwritten signature.