Perhaps masviss thinks of some other file or system. But for 4K he is not correct. Inside the rlf file is the L number and the locking ID. The file is clear text, the parameters are easy to see, so I assume masviss did not look.
lisluk is correct. If you login to the host OS for each node (root login) with an SFTP client, you can copy the license from that directory. If you have installed for example 3 licenses (example, user bought more ports, expanded the system), there will be 3 rlf_ files in that directory. The current license file is the one with the newest date. The grpf file is the grace period license generated on new install, you don't need that. Just take the latest rlf file from each node, they should have matching dates. If you have only ever installed one license, there will be only one rlf file. These files can be used to relicense the nodes on a new install.