| 摘要 |
Access to an audiovisual product is controlled, through the use of scrambled video streams. Cells 420 of audiovisual data A,B,C1,D are scrambled into at least first and second video streams 1901, 1902. A video stream switch instruction 2011, 2021 automatically switches between at least first and second video streams 1901, 1902 during reproduction, so that cells are reproduced from an appropriate video stream 1901, 1902 at appropriate times. Multi-angle video objects 2020 hold the cells 420 in a selected video stream 1902, and hold nil or erroneous data C2 in other streams 1901.
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