Modern softkey licenses generally require an internet connection for periodic validation, though network licenses can often be "borrowed" for offline use for up to 30 days.

If you are changing your computer's motherboard, CPU, or hard drive, navigate to the Zemax License Manager first and click Transfer Out to return the license to the cloud activation pool. Hardware changes alter your machine's fingerprint, which invalidates active softkeys.

: Fixed softkey and hardware licenses allow you to work without a constant internet connection, which is ideal for secure environments or field work.

I can help you find the current renewal policies or compare the total cost of ownership for both options. Share public link

If you own an old "fixed" black or green USB dongle, it may still work, but you likely cannot upgrade to the latest software versions without a support contract (ZSupport).

ZLM.exe --generate-hostid --output hostid.txt

A , often called a perpetual license , is a one-time purchase that allows you to use a specific version of OpticStudio indefinitely. Unlike subscriptions, which stop working if not renewed, a perpetual license does not expire. Key characteristics include:

Following the acquisition by Ansys, the licensing landscape has changed. Ansys primarily uses a FlexLM network shared license system.

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Fewer conflicts with Windows Update and USB driver failures.