| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress the occurrence of a state in which a user of an authorized receiver cannot view content during the revocation of an unauthorized receiver. <P>SOLUTION: A broadcast receiving apparatus receives a broadcast wave containing multiple channels. The apparatus includes: a generating unit that generates a first-type encryption key in accordance with a computer program stored in a memory; a selecting unit that selects a channel from the broadcast wave; an obtaining unit that obtains an encrypted second-type encryption key and encrypted content from the selected channel; a decrypting unit that decrypts the encrypted second-type encryption key using the first-type encryption key and decrypts the encrypted content using the decrypted second-type encryption key; a receiving unit that receives an updated program to generate an updated first-type encryption key; a determination unit that determines, for all channels that can be selected, whether an encrypted second-type encryption key that can be decrypted using the updated first-type encryption key can be obtained; and an updating unit that updates the program stored in the memory when the determination unit determines that the obtainment is possible for all the channels. <P>COPYRIGHT: (C)2010,JPO&INPIT |
