When a file that's protected by SmartCipher arrives in someone's inbox, the user is alerted to that fact but is otherwise unimpeded from opening the file and accessing its contents based on a rules set that it carries. According to Kasan, the security rules add little to the file's overall payload. "In active mode, it adds 16K[bytes]. But with today's file capacities, that's almost insignificant," he said. There's also a simulation mode, which lets IT departments determine whether the policies being considered are going to be adequate for the organization. In this mode, the security payload is even smaller.