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For example, to create a node-locked local license that will work on two known systems, you can lock against multiple, different items on each host in the following format:
<CLIENT_HOSTID>
<SETTING ETHERNET="123..."/>
<SETTING HOSTNAME="ALPHA1"/>
</CLIENT_HOSTID>
<CLIENT_HOSTID>
<SETTING CUSTOM="ABCDEF..."/>
<SETTING USERNAME="joe user"/>
</CLIENT_HOSTID>
This example locks against ethernet+hostname for system 1, and username+custom on system 2.
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