The client version can be found in the OwnerMaint on the device.
For the server version, type the following on a green screen command line - DSPPGM PPLBTAxx/SVPDAI DETAIL(*COPYRIGHT)
Results would look similar to the following:
Display Program Information
Display 1 of 1
Program . . . . . . . : SVPDAI Library . . . . . . . : PPLBTAMP
Owner . . . . . . . . : MMUELLER
Program attribute . . : RPGLE
Detail . . . . . . . . : *COPYRIGHT
Copyright information:
Copyright Information Systems Engineering. Version 2.5 Build 20110124