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TCP-group 1994


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Re: Does NOS SMTP LZW mode infringe on Welch patent?



> 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.

Alan






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