On Apr 12, 2007, at 12:33 PM, coderman wrote:
block level identification and caching/distribution is useful, effective, and proven for a wide variety of tasks. riverbed [0] in particular is doing good *legitimate* business with this technique for WAN acceleration, and there are many other applicable domains. best regards, [0] Riverbed RiOS Technology http://www.riverbed.com/technology/
First, I don't want to diminish the work of the researchers: They chose a problem and came up with an interesting solution.
Delta compression and finger-printing techniques are already well- known in applications such as Riverbed's, and that technology is certainly interesting and useful. I view this paper as an extension of those techniques for a use in a decentralized system with the constraint of uncorrelated sources. If the uncorrelated sources constraint went away, and similar data tended to come from the same ingest points, then there are much simpler routes that you could take such as a simple extension of the rsync concept. Since this research focuses on on the effectiveness of the technique for uncorrelated sources, I'm led to conclude that the focal use case is piracy.
Maybe the title is misleading, but "Computer scientists develop P2P system that promises faster music, movie downloads" primarily applies to illegal file sharing as far as I'm concerned. These approaches will do little if anything to speed up one->many movie and music distribution systems.
(Justin: surely you, of all people, would be aware of the many uses for powerful content distribution tools across the spectrum of ethical/unethical uses. why so quick to dismiss a useful technique with the tarnish of piracy?)
Because I think there are simpler and more efficient techniques for delta-compression for most of the legitimate uses.
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