22c0e3c8_pgrade_and_Installation_Manual__Explanation
[Required Information] PAK information [Explanation] 
The information listed on Product Authorization Keys (PAKs) for any new products you will register. You do not need to register your OpenVMS VAX license or the licenses for any System Integrated Products (SIPs) you are already running.
OpenVMS VAX Version 7.3 Upgrade and Installation Manual
Explanation