The serial number should be read-only.Can sneep prevent changes to it?
Not really. Sneep is a simple utility which depends on the services of the “eeprom” command and the semantics of Open Boot PROM variables. While sneep could refuse to make changes to the serial once it has been set, there is nothing to prevent a user from directly using the “eeprom” command or the OBP “nvedit” commands to alter the data. In addition, some platforms (especially non-Sun x86/x64 machines) may report the serial number incorrectly, and on those platforms, it is necessary to be able to override the hardware-provided serial. Sneep is the only way to do this that we know of. However, there is no obvious reason why anyone should go to the trouble of changing the serial number once it has been saved with sneep. Having it available is a convenience, not a requirement or a license in itself. Changing the value provides no real advantage to the user. Even so, root permission is required to make the change in Solaris, and sneep will log any such change in syslog. Common data-center
