SMARTPHONE-BASED CONDITIONAL ACCESS SYSTEM

Techniques for a smartphone-based conditional access (CA) system are described. In some embodiments, a head end in the CA system obtains a security profile associated with a pair of receiving devices used by a user, e.g., a first device (e.g., a smartphone) and a second device (e.g., a set-top-box or a TV). The head end dynamically regulates user access to requested media content during each entitlement period by assigning and distributing separate keys to the first and second device based on the security profile. The head end also uses the distributed keys to protect the media content before broadcasting. On the receiving end, one receiving device receives the media content and determines whether it is decryptable by the device. If decryptable, the receiving device (e.g., the set-top-box/TV) decrypts the media content using the keys assigned by the head end. Otherwise, the receiving device forwards the media content to the pairing device for decryption. 描述了用于基于智能电话的有条件访问(CA)系统的技术。在一些实施方案中，CA系统中的前端获得与用户使用的一对接