You specify the license key (-k) OR the license type (-l) and number of users/chips (-u), but not both.
You should change to one of the following to license the server:
dblic -l perseat -u 5 /opt/sqlanywhere16/bin64/dbsrv16.lic "Company"
OR
dblic -k <key> /opt/sqlanywhere16/bin64/dbsrv16.lic "Company"
--Jason