No, a license key stays with the first cape it is registered to. Once the license key is applied to a cape, it is tied to that cape. The Pi/BB/PB device Serial Number is also recorded in the signed EEPROM and FPP checks that serial number to make sure it matches the device when FPP starts. This is done to prevent someone from copying a signed EEPROM to multiple capes. We will grant a transfer exception in the case of a lightning strike or something similar that breaks a cape beyond repair, but we do not support moving license keys around because we have no way to remotely disable the key on the first cape.