Voltage Security doesn't make electrified fences, it specializes in secure e-mail and business communications tools. The company uses encryption technology originally developed by computer science students at Stanford University, who went on to found Voltage Security, along with professors from Stanford and UC Davis. The software helps clients comply with federal regulations as HIPAA and Sarbanes-Oxley. The company's customers include Byram Healthcare Centers, Healthaxis, and the Phelps County Regional Medical Center in Missouri. Voltage Security counts Hummer Winblad, JAFCO Ventures, Menlo Ventures, Morgenthaler, and Siemens Venture Capital among its investors.