hspice netlist encript
I think this probably be the library encryption feature. Library encryption allows you to distribute proprietary Hspice models, parameters and circuits to other people without revealing your company's sensitive information. Recipients of an encrypted library can run simulations that use your libraries, but Hspice does not print encrypted parameters,encrypted circuit netlists, or internal node voltages. Your library user sees the devices and circuits as "black boxes," which provide terminal functions only.