Access Control Manager Virtual. Web-Based PACS Appliance for 64 Readers, includes: Embedded Linux OS & Open LDAP licenses for configuration database. Access Control Manager Security Management Software License. Four (4), AC-SW-LIC-16RCU-6-P, 16 Reader Count Software License. Total reader capacity can be expanded from 64 to 2,048 readers, in increments of 16, with the purchase of the desired quantity of AC-SW-LIC-16RCU-6-P, 16 Reader Count Software Licenses. VMware™ software required and not included.