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From: "Jim Whitehead" <ejw@cse.ucsc.edu>
To: <fork@example.com>
Subject: RE: Microsoft buys XDegress - more of a p2p/distributed data thing...
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Date: Wed, 11 Sep 2002 08:35:31 -0700
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XDegrees was at the WebDAV Interoperability Testing Event last year, so
there may be some DAV under the hood there someplace.

- Jim

> -----Original Message-----
> From: fork-admin@xent.com [mailto:fork-admin@xent.com]On Behalf Of
> Gordon Mohr
> Sent: Wednesday, September 11, 2002 12:00 AM
> To: fork@example.com
> Subject: Re: Microsoft buys XDegress - more of a p2p/distributed data
> thing...
>
>
> Mr. FoRK writes:
> > "Files can be cached on multiple systems randomly scattered around the
> > Internet, as with Napster or Freenet. In fact, the caching in
> XDegrees is
> > more sophisticated than it is on those systems: users with high
> bandwidth
> > connections can download portions, or "stripes," of a file from several
> > cached locations simultaneously. The XDegrees software then reassembles
> > these stripes into the whole file and uses digital signatures
> to verify that
> > the downloaded file is the same as the original. A key component of this
> > digital signature is a digest of the file, which is stored as
> an HTTP header
> > for the file."
>
> This "more sophisticated than [Napster or Freenet]" part seems
> to be the same behavior implemented in many other P2P CDNs,
> such as:
>
>   - Kazaa
>   - EDonkey/Overnet
>   - BitTorrent
>   - Gnutella (with HUGE extensions)
>   - OnionNetworks WebRAID
>
> ...though the quality of the "digest" used by each system varies
> wildly.
>
> - Gordon
>


