Voltage is a resold product for gateway or desktop encryption.
SMB prices are used for any corporation with less than 2500 employees. SMB license allows software to be installed on up to 4 servers.
Enterprise prices MUST be used for any corporation over 2500 employees. Enterprise prices are available for either the entire enterprise or just selected, named, users (for example, an enterprise has 4500 employees but only requires a department of 250 to use encryption. You would sell them 1-5000 Named Users under the Enterprise tab.) Enterprise license allows software to be installed on up to 8 servers.
Voltage Dell or IBM hardware may be purchased; software can also be installed on any hardware already owned by the customer.