One of the most important things you need to look for in any electronic signature provider you are considering using is their level of compliance with the various laws that govern the use of electronic signatures. Here in the US, you will find that there are in fact two very specific laws that clearly define what makes an electronic signature and are in place to protect those who use them.
The laws governing the use of electronic signatures are eh ENSIGN Act and UETA. The provider you decide to use should state that they are in full compliance with these regulations and that their software works within the auspices of these laws. At Digi-Sign all of the software we use to provide you with access to electronic signatures so that you can continue to conduct your business secure in the knowledge that all e signature will hold up in a court of law should the need arise.