1999.11.30 22:23 "libtiff 3.5.3 release.", by Michael L. Welles

1999.12.01 18:35 "Re: libtiff 3.5.3 release.", by Daniel McCoy

Covers non-commercial use?? What about if you write your own LZW compression [the algorithm is published and well known]. I have done that in more than one executable.

The way I understand it, Unisys is fine with that as long as you don't distribute it in any way. You can write it, but you can't give it away.