This article explains how to exchange your ZEMAX hardlock key for a new Sentinel USB key.

Insure your key for the full replacement value, just like any other piece of property.

Question: With the network key I can see what is using a ZEMAX license at any one time. Can I write this data to a log file for subsequent analysis?

ZEMAX uses a hardware key for copy protection. Users in highly secure environments need to know whether the key is capable of being written to. The short answer is No, and this article gives more details.