Broadcast transmitter, a broadcast transmitting method and a broadcast receiving method

Abstract

In one embodiment, a broadcast transmitter includes: a viewer information memory configured to store viewer information regarding a viewer who signs up for a subscription; a generator configured to generate individual information regarding a conditional access of a content including a first expiration time indicating an expiration time of the individual information and a second expiration time set independently of the first expiration time for each the viewer who signs up for the subscription based on the viewer information; and a transmitter configured to transmit a broadcast signal including the generated individual information.

1 . A broadcast transmitter comprising:
 a viewer information memory configured to store viewer information regarding a viewer who signs up for a subscription;   a generator configured to generate individual information regarding a conditional access to a content for each the viewer who signs up for the subscription based on the viewer information, the individual information comprising a first expiration date indicating an expiration date of the individual information and a second expiration date set independently of the first expiration date; and   a transmitter configured to transmit a broadcast signal including the generated individual information.   
     
     
         2 . The broadcast transmitter of  claim 1 , wherein the second expiration time indicates an expiration date of displaying a message notifying that the content cannot be viewed because the individual information has not been received yet. 
     
     
         3 . The broadcast transmitter of  claim 1 , wherein the second expiration date is set to be after the first expiration date. 
     
     
         4 . The broadcast transmitter of  claim 1 , wherein the transmitter is configured to multiplex the generated individual information and the broadcast signal, and transmit the multiplexed signal until the second expiration date. 
     
     
         5 . A broadcast transmitting method comprising:
 generating, by a generator, based on viewer information regarding a viewer who signs up for a subscription stored in a memory, individual information regarding a conditional access to a content including a first expiration date indicating an expiration date of the individual information and a second expiration time set independently of the first expiration time for each the viewer who signs up for the subscription; and   transmitting, by a transmitter, a broadcast signal including the generated individual information.   
     
     
         6 . A broadcast receiving method comprising:
 reading, using a determination module, a first expiration time indicating an expiration time of individual information and a second expiration time set independently of the first expiration time included in the individual information addressed to an apparatus including the determination module regarding a conditional access of a content stored in an individual information memory, the individual information being obtained by demultiplexing a received signal;   comparing, by the determination module, the first expiration time, the second expiration time, and a current time;   determining, by the determination module, whether a content can be viewed based on the comparison result; and   displaying, using a display, a message indicating whether the content can be viewed based on the determination result.   
     
     
         7 . The broadcast receiving method of  claim 6 , wherein
 the second expiration time indicates an expiration time of displaying a message that a viewing cannot be done because the individual information has not been received yet, and   the determining includes determining that the viewing cannot be done because the individual information addressed to the apparatus including the determination module has not been received yet if the current time is after the first expiration time and is before the second expiration time, and   the displaying includes displaying the message that the viewing cannot be done because the individual information addressed to the apparatus including the determination module has not been received yet if the current time is after the first expiration time and is before the second expiration time.   
     
     
         8 . The broadcast receiving method of  claim 7 , wherein
 the individual information addressed to the apparatus including the determination module includes a power maintaining time indicating a time to maintain a power and a selected channel to update the individual information addressed to the apparatus including the determination module, and   the displaying includes displaying a message that the selected channel is requested to be maintained for the power maintaining time if the current time is after the first expiration time and is before the second expiration time.   
     
     
         9 . The broadcast receiving method of  claim 7 , wherein
 the determining includes determining that the viewing cannot be done because a subscription has not been signed if the current time is after the second expiration time, and   the displaying includes displaying a message that the viewing cannot be done because the subscription has not been signed if the current time is after the second expiration time.