Cisco ASA-VPNS-500= software license/upgrade

Shared license support for SSL VPN: The shared license server device (holding the shared license) and participant devices must be able to communicate with one another on an internal network either directly or through a VPN connection. Each participating device must have a license that enables the shared licensing capability. Shared licenses support the full AnyConnect feature set, including Cisco Secure Desktop and clientless SSL VPN.