Secure Voice

On 8/22/93 Harry Bartholomew mentioned a new "secure voice" product from SVC in College Station, TX. Does anyone have more info on this product, ie a phone number? Question: He states that they offer "lifetime upgrades" but also that they do not mantain cust. records (for privacy), so how does one find out about new releases. Wouldn't one need to "poll the company" to learn of a new release and wouldn't that turn into a headache for the company? (Assuming they've sold significant numbers) Brian