# Notes on Licensing

You must install License Server on a machine with a known, static IP address.

After you set up your licensing, you can revoke licenses at any time, for example, to reallocate them to different clients, or to change a client IP address.

For modules that License Server licenses, you must not:

- remove the contents of the `license` and `uid` directories.

- change the IP address of the machine on which a licensed module is running.

- change the service port of a module.

- replace the ethernet card.

Any of these changes can cause the module to become inoperable. If you need to make changes to a module, you must first revoke the license, and then reissue the license after you have made the change.

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