A site key allows a user to run a product on any CPU, but the user must still be licensed for the product therefore individual product keys are still needed.
CA Common Services for z/OS R15
As of the changeover to Broadcom all mainframe contracts will be established with a Site key. LMP (Site) keys will be delivered to the technical contact upon contract establishment. Contract holders will still be governed by the terms of their paper contract (MIPS, MSU, etc). This has been done to improve the efficiency of Broadcom licensing staff.
A site key allows a user to run a product on any CPU, but the user must still be licensed for that product. Therefore, individual product keys will still be needed.
A site key can be used at a DR(Disaster Recovery) site since there is no CPU check and therefore no EKG(Emergency Key) is required.
See section "SITEID Type LMP Keys".
Documentation reference for Common Services 15.0: CA LMP and CAIRIM
Documentation reference for Common Services 14.1: CA LMP and CAIRIM