| 摘要 |
A method of controlling revelation of one or more metadata items is disclosed. Each of the one or more metadata items is associated with one or more parts of an audio-visual data stream (101). The method comprises: for a given one or more parts (103, 105) of the audio-visual data stream (101), revealing one or more metadata items (113, 115, 117) associated with the given one or more parts (103, 105) of the audio-visual data stream (101) only after the given one or more parts (103, 105) of the audio-visual data stream (101) have been accessed.
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