| 摘要 |
There is described a communication system ( 10; 300; 2400; 2700 ) comprising a data content transmitter and at least one data receiver ( 50; 500; 2600 ). The system ( 10; 300; 2400; 2700 ) executes a method of associating data content with rights objects. The method comprises steps of (a) providing data content, rights objects defining rights to the content, and control messages for controlling subsequent processing of the content; (b) generating textual identifiers which are operable to associate said content with said rights objects; (c) transforming the textual identifiers into corresponding identification numerical data, said numerical data being more compact than their corresponding textual identifiers; and (d) compiling the numerical data, the rights objects and the messages into output for transmission and subsequent receipt at the at least one data receiver ( 50; 500; 2600 ). Transforming the textual identifiers potentially results in less data to be communicated and hence a reduced bandwidth requirement. The method is relevant, for example, to digital video broadcast (DVB).
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