Authorization iButtons® are sophisticated microelectronics, sealed into miniature stainless steel cans, creating a low cost, portable medium for storing and controlling access to sensitive information. iButtons are used with port adapters as a hardware based protection system for software. iButtons help protect the right to copy software by actually protecting the right to execute it. Software can now be locked to a user, a machine, or an application with a complete audit trail and guaranteed uniqueness. * Provides a unique 64-bit serial number, 4K bits of RAM * No external power required * Uses inexpensive 1-Wire® protocol * Universally portable across platforms * Programmable secure real time clock with alarm and elapsed timer.