If the License Manager is used to deactivate software, it will leave the prior serial key in the registry. On subsequent activations, the Activation Wizard will automatically populate the serial number field. I assume the same kind of thing will happen with .lic/.lc licenses.
I can see a valid use case for this, but in my scenario, I need to remove development licenses from productions and disallow users to reactivate the software without getting permission (the serial key) from me. Since these keys can be found in the registry, I can write a script to do this; however, it seems like a feature that License Manager should include.
PS: I know, I used the wrong idea label. We need more label flexibility to cover other smaller NI software!