A countermeasure for differential power analysis attacks on computing devices. The frequency measurement circuit includes a frequency measurement unit for counting a reference clock during a counting period having a predetermined number of waves of the input signal. On the other hand, when the reflectance of the test optical laser component is lower than 98% or there is no measurable CRD signal, by removing the output cavity mirror in the CRD apparatus, a photometric configuration is formed to measure the reflectance. Tie first display document 30 is edited in a display document visual editing environment 23, and a second display document 32 and an editing operation history file 33 are generated. The bottomless lining sleeve and the hollow sole pad permits the lining sleeve to be secured and sealed watertight to the sole pad in a less complicated manner. Income attributable from the ring-fenced assets after the conversion date andor proceeds derived from the disposition of ring-fenced assets after the conversion date is distributed to the investors having the second interest type.