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TCP-group 1994

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Does NOS SMTP LZW mode infringe on Welch patent?

To: tcp-group@ucsd.edu
Subject: Does NOS SMTP LZW mode infringe on Welch patent?
From: bruce@pixar.com (Bruce Perens)
Date: Fri, 9 Dec 94 20:56 PST

A naive' question that's probably been answered long ago:

When Terry Welch wrote the old Unix "compress" program, his employer
patented his improvement on Lempel and Ziv's compression algorithm. I
understand this patent is now owned by Unisys.

Does the Lempel-Ziv-Welch compression used in NOS compressed SMTP service
infringe upon this patent?

	Thanks

	Bruce Perens AB6YM

--
<a href="http://www.rahul.net/perens>Bruce Perens AB6YM</a>
Voice phone: 510-215-3502  Internet: Bruce@Pixar.com
Amateur Radio TCP/IP: Bruce@ab6ym.ampr.org
Amateur Radio BBS network: ab6ym@n0ary.#nocal.ca.usa.noam

Follow-Ups:
- Re: Does NOS SMTP LZW mode infringe on Welch patent?
  - From: iialan@iifeak.swan.ac.uk (Alan Cox)

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