One license key is required for each z/OS system that is to be managed. A license is required for each physical mainframe machine. The same license key is used for multiple LPARs on the same physical system.
Contact your Precisely account executive or use the Precisely Support portal: support.precisely.com to get the necessary license keys. You may be asked to give the serial number of the zSeries system (or first logical serial number in a multi-CPU LPAR system). The serial number can be found by issuing a "DISPLAY M=CPU" or "DISPLAY M=CORE" command from a z/OS console and reading the last five characters of the CPC ND line of the output.
For example, the following output shows that the serial number of this particular zSeries system is 70571:
DISPLAY M=CPU
IEE174I 06.00.00 DISPLAY M
PROCESSOR STATUS
ID CPU SERIAL
0 + 0105717060
1 + 1105717060
2 + 2105717060
3 + 3105717060
CPC ND = 007060.H30.IBM.02.000000070571
CPC SI = 7060.H30.IBM.02.0000000000070571
CPC ID = 00