Re: Does NOS SMTP LZW mode infringe on Welch patent?
- To: firstname.lastname@example.org (Bruce Perens)
- Subject: Re: Does NOS SMTP LZW mode infringe on Welch patent?
- From: email@example.com (Alan Cox)
- Date: Mon, 12 Dec 1994 10:45:26 +0000 (GMT)
- Cc: firstname.lastname@example.org
- In-reply-to: <m0rGJqn-0005jnC@mongo.pixar.com> from "Bruce Perens" at Dec 9, 94 08:56:00 pm
> 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?
If you use it for anything but research in the USA yes. Around here it's not
a problem 8). The gzip system is patent free so a XGZP is probably the better
move. Its also more efficient at compressing although it does seem to like
a lot of memory.