DCC is patented

Ruben Safir Secretary NYLXS ruben@mrbrklyn.com
Wed Oct 27 17:23:21 UTC 2004

Such a broad patent will never hold up in court, along with the other 80%
which are found invalid.

Screw the patent.


On Wed, Oct 27, 2004 at 01:09:32PM -0400, John R Levine wrote:
> I recently learned about patent 6,330,590.  It was filed in Jan 1999,
> which means the work it covers was done in 1998, and fairly broadly covers
> spam filtering by counting message signatures.
> A PDF copy of the patent is http://www.taugh.com/6330590.pdf
> If you haven't read patents before, the first part describes the invention
> but isn't legally very important.  The crucial bits are the claims which
> start on page 6.  Claims 1 and 2 and claim 30 look a lot like DCC.
> Anti-spam vendor Commtouch recently bought the patent:
> 	http://www.commtouch.com/news/english/2004/pr_040913.shtml
> 	http://www.internetnews.com/xSP/article.php/3407601
> They say they're going to start selling licenses.  Uh, oh. How long ago
> did you start work on DCC?  If it's older than Jan 1998, you're OK.  If
> not, this guy probably got there first.
> Regards,
> John Levine, johnl@iecc.com, Primary Perpetrator of "The Internet for Dummies",
> Information Superhighwayman wanna-be, http://iecc.com/johnl, Mayor
> "I dropped the toothpaste", said Tom, crestfallenly.
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