What a verified licence says. Only Aker.LicenceFile builds one,
after every signature and field passed, so holding one means a trusted
root key's working key issued it for this install.
features lists the features the licence sells beside its seats; a
licence without the field reads as [].
Summary
Types
@type t() :: %Aker.Terms{ customer_name: String.t(), features: [String.t()], install_public_key: binary(), issued_at: DateTime.t(), licence_id: String.t(), machine_id_hash: String.t(), moves_per_term: non_neg_integer(), seats: non_neg_integer(), serial: pos_integer(), term_end: DateTime.t(), term_start: DateTime.t(), working_key_id: String.t() }