From iDRAC web UI:

From racadm (SSH to iDRAC or from OS with OpenManage):

racadm license view
racadm getsysinfo

From Lifecycle Controller (F10 during boot):


Using racadm:

racadm license import -f <filename>.xml
racadm license view

No. Licenses are tied to the Service Tag. Attempting to alter the license file or inject it into another server fails cryptographically.