Using the Riverbed Cloud Portal : Managing licenses : Reclaiming a license
  
Reclaiming a license
After an appliance is registered, the license associated with it cannot be used by other appliances. Reclaiming a license removes the appliance from the portal database and generates a new one-time token for the license. The previous one-time token that was installed on the appliance is no longer valid. The portal displays the license in the Unused Licenses section of the Licenses page.
Reclaiming a license does not affect the appliance’s underlying virtual machine. If you want to fully deprovision the appliance, you must manually deprovision it using tools available from your cloud platform provider.
The ability to reclaim a license can be useful in situations like evaluating several cloud platform providers. You need only one license to include the SteelHead-c as part of the evaluation, because the license is portable between different cloud providers.