| 摘要 |
The present invention relates to a method of downloading a conditional access system (CAS) for digital broadcasting in a digital broadcasting system. More specifically, the present invention includes a transmitter which includes a DCAS authentication proxy (AP), a personalization server, a DCAS provisioning server, and a head-end, and a set-top box as a receiver, which includes a DCAS host. In particular, a mutual authentication occurs between the DCAS AP and the DCAS host and key distribution, between the personalization server and the DCAS host and key distribution, and between the DCAS provisioning server and the DCAS host and key distribution in order to protecting a conditional access system that descrambles scrambled broadcasting contents when broadcasting contents are downloaded from an IP-TV broadcasting system and viewed.
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