| 摘要 |
A method of extracting sections of a data stream, the sections including a set of sequences. Each sequence is encoded separately and coupled together to define a section. The method involves determining a combination of at least two sequences of the set, comparing the combination of sequences with sequences in the data stream, and rejecting or accepting extraction of the section of the data stream based upon the result of the comparison. If the combination of sequences does not include a start and end marker for the section, a search for the start and end markers is carried out before the section is extracted.
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