How about the following revised text for Threat 1:
Threat 1: User modifies a device to masquerade as another valid
certified device
Regulatory environments require that devices be certified and
register in ways that accurately reflect their certification.
Without suitable protection mechanisms, devices could simply
listen to registration exchanges, and later registering
claiming to be those other devices. Such replays would allow
fasle registration, violating regulatory regimes.
A white space database may be operated by a commercial entity
which restricts access to authorized users. A master device
needs to identify itself to the database and be authorized to
obtain information about available channels.
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