A one-piece pull-tight or strap-type security seal adapted for closing bags or the like that is designed to be easily applied in comparison with existing ones. It accomplishes this automatically by inspecting paths in a binary decision diagram representation of the logical relationship between the signal values in the circuit. Adjacent faces of the locking members have cooperating teeth for preventing relative rotation. A vendor server may be a member of an exchange comprising a logical grouping of servers authorized and configured to interact with one or more information accounts, such as differently branded information accounts.