| 摘要 |
<p>Conditional access system for controlling the access of receivers of end-users to a data content source (2) in an uplink system (1). Said uplink system comprises a scrambler for scrambling data content supplied from the data content source, an entitlement control message generator (6) for generating entitlement control messages (ecm) containing a control word (cw) and an entitlement identification and a transmitter for transmitting the scrambled data content and the entitlement control messages. A separator (3) is coupled to the data content source (2) for separating a part of the data content from said source into at least one object data stream representing a preselected object of the data content part and a remaining data stream representing the data content part without the object data. The at least one object data stream is supplied to the input of the scrambler. A combiner (10) is connected to the output of the descrambler for combining the descrambled object data with the remaining data content. An individual entitlement is allocated to said object.</p> |
