Methods are provided for detecting the processing status of data blocks in systems having intermittent connections. A hash value is used at times in place of a block's data content, thereby reducing processing of the block. Hash values may be maintained locally. Blocks collected locally may be stored locally at least until a connection to a server becomes available again. Systems and configured storage media are also provided.

 
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> Method for searching content particularly for extracts common to two computer files

> Video-signal processing system, video-signal processing apparatus and method, recording medium, and program

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