Run docenta-license fingerprint on the machine that will run docenta and paste the
device code below. You will receive a lease file bound to that machine; install it with
docenta-license install lease.cbor --keys keys.cbor. Nothing on your machine talks
to this site; you are the transport.
The operator's half of Flow A: the code shown by docenta-license activate, the
license it belongs to, and the operator secret (until sign-in lands, this page IS the operator).