You really should read the ARSperl Programmer's Manual! ARSperl is well documented and even has examples that would have been of use to you. ars_GetListUser returns an array of hash references. The licenseType key of the referenced hashes is an array reference.

Incomplete and totally untested code follows:

# ... start of code
(@curusers = ars_GetListUser($ctrl, 2)) || die $ars_errstr;

foreach my $hashref (@curusers) {
  print "userName: ", $hashref->{userName}, " licenceType: ", @{$hashr
+ef->{licenseType}}, "\n";
}
# ... rest of the code here
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