JASDEC takes into the consideration of an important social role as an infrastructure of Clearing system in Japan so far and also executing the disposal of necessary safety policy from the both sides of an operation wise and a system side. However, as the important changes to the flow of paperless situation versus eligible securities might be expected on dramatic change. Under this circumstance, not only risk on computer system but clerical risks existence should be eliminated to protect the important property for whole participants, all of staffs in JASDEC carry out our policy as "Security Policy"