I have just looked at an ESXi installation for a new client and I can see that it has an Enterprise Plus license applied.
I'm heavily suspicious as to whether anyone would have actually purchaseded this for a single server. I don't want to try and contact VMWare sales over this - the goal is to sell a legit license not get them in trouble.
Is there any way of looking at a license and determing if it is, for example, someone's NFR or Internal Use or trial license?
Obviously if it's legitimately purchased by someone else and reused I'm aware I won't have much hope of determining it.
no, the only way is to get to know either through a vendor (if you know), else VMWare.
What you can do is just call them up for faster clarification rather than logging a ticket.