What is the use of epsec-package file in APM ?

Hello Team , 

What is the use of epsec-package file in APM ?

How EPSEC works in APM ?

apm epsec epsec-package epsec-1.0.0-1622.0.iso {
    create-time 2024-09-19:12:50:37
    last-update-time 2024-03-21:11:07:38
    mode 33188
    oesis-version 4.3.3969.0
    revision 1
    size 301641728
    system-package true
    updated-by root
    version 1.0.0-1622.0
}