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1999.11.30 22:23 "libtiff 3.5.3 release.", by Michael L. Welles
1999.11.30 22:53 "Re: libtiff 3.5.3 release.", by Izumi Ohzawa
1999.11.30 23:07 "Re: libtiff 3.5.3 release.", by Tom Lane
1999.12.01 00:08 "Re: libtiff 3.5.3 release.", by Michael L. Welles
1999.11.30 23:22 "Re: libtiff 3.5.3 release.", by Daniel McCoy
1999.12.01 13:56 "Re: libtiff 3.5.3 release.", by Bruce Cameron
1999.12.01 18:35 "Re: libtiff 3.5.3 release.", by Daniel McCoy
1999.12.02 07:06 "", by Ruediger
1999.12.01 03:15 "Re: libtiff 3.5.3 release.", by Bob Friesenhahn
1999.12.01 16:04 "Re: libtiff 3.5.3 release.", by Michael L. Welles
1999.12.01 16:43 "Re: libtiff 3.5.3 release.", by Tom Lane
1999.11.30 23:07 "Re: libtiff 3.5.3 release.", by Martin Bailey
1999.12.01 14:08 "Re: libtiff 3.5.3 release.", by Bruce Cameron
1999.12.01 15:02 "Re: libtiff 3.5.3 release.", by Klaus Bartz
1999.12.01 16:17 "RE: libtiff 3.5.3 release.", by Peter Smith
1999.12.01 16:49 "RE: libtiff 3.5.3 release.", by Darrin Cardani
1999.12.01 19:20 "Re: libtiff 3.5.3 release.", by Chris Hanson
1999.12.01 14:33 "Re: libtiff 3.5.3 release.", by Andy
1999.12.01 14:42 "ZIP compression [was: libtiff 3.5.3 release.]", by Tom Kacvinsky
1999.12.01 15:24 "Re: ZIP compression [was: libtiff 3.5.3 release.]", by Leonard Rosenthol
1999.12.01 15:51 "Re: ZIP compression [was: libtiff 3.5.3 release.]", by Tom Kacvinsky
1999.12.01 18:04 "Re: ZIP compression [was: libtiff 3.5.3 release.]", by Bryan H. Maret
1999.12.02 05:16 "Re: ZIP compression [was: libtiff 3.5.3 release.]", by Leonard Rosenthol
1999.12.01 17:39 "Re: ZIP compression [was: libtiff 3.5.3 release.]", by Bryan H. Maret
1999.12.02 11:42 "Re: ZIP compression [was: libtiff 3.5.3 release.]", by Ivo Penzar
1999.12.06 20:42 "Re: ZIP compression [was: libtiff 3.5.3 release.]", by Andy

1999.11.30 23:07 "Re: libtiff 3.5.3 release.", by Tom Lane

Now, I need a solid reference that LZW decompression is not covered by the LZW patent. Nothing I have read, except for opinions or second-hand quotes at various forums, clearly indicates that decompression is not part of the patent.

Especially, does anyone have written views from the Unisys itself on this?

Unisys' view is perfectly clear: they claim that decompression-only software *is* covered by the patent. (They have a webpage giving their version of reality at www.unisys.com, check there for an exact quote.)

There are a number of qualified people who think that Unisys' interpretation wouldn't hold up in court, and that a court would say that decompression-only software isn't covered. But AFAIK there's been no test case to find out. Do you want to be the test case?

Regardless of what court may or may not rule in the end, that doesn't matter. Most of us here, I think, just don't want to hear from Unisys counsels, ever.

Yup. That's why I'm not shipping either LZW compression or decompression code in libjpeg these days. It was a relatively painless decision for me, because GIF-reading was never a critical part of libjpeg, but I can see that dropping the LZW decompressor would be crippling for libtiff :-(. Don't have any good advice...

regards, tom lane
organizer, Independent JPEG Group