Patent ID: 7146633

Claim:
A digital broadcast receiving device that receives a broadcast wave including interactive data to achieve pseudo-interactive communications, the interactive data being repeatedly broadcast, the digital broadcast receiving device comprising: a receiving unit for receiving the broadcast wave which includes first information and second information, the second information having conditions for using the broadcast wave, and the first information being recorded on a recording medium; a judging unit for judging a state that is established during the reception of the broadcast wave based on the first information, the state being one of a preview state, a prohibited state, and a permitted state the judging unit including an obtaining subunit for obtaining the first information from the recording medium, wherein the first information shows conditions for using the received broadcast wave under a subscription contract; a contract judging subunit for judging whether the first information and the second information are the same, determining that a subscription contract is made, on judging that the first and second information are the same, and determining that the subscription contract is not made, on judging that the first and second information are not the same; a preview state judging subunit for (a) judging whether a predetermined period has passed since a start of reception of the broadcast wave, if the contract judging subunit determines that the subscription contract is not made, (b) determining that the preview state is established during reception, on judging that the predetermined period has not passed, and (c) determining that the prohibited state is established during reception, on judging that the predetermined period has already passed, wherein in the preview state, the received broadcast wave may be permitted to be used regardless of the subscription contract being made, and wherein in the prohibited state, the broadcast wave is prohibited from being used because the subscription contract is not made; and a restricting unit for restricting use of the interactive data when the preview state is judged as established, regardless of a subscription contract being made, or the prohibited state being judged as established.