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I believe this is covered by Jesse Kornblum in a paper from 2006 called: "Identifying almost identical files using context triggered piecewise hashing"

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put on hold as off-topic by Ron J., George White, Soren, Robert Cartaino 9 hours ago

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question doesn't follow the format for prior art requests and/or is missing information necessary to properly research this patent." – Ron J., Robert Cartaino
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Please follow the prescribed format if this is a prior art request. As written, it is difficult to answer. –  Ron J. Jun 18 at 13:29

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