The catch is that it appears to be difficult or impossible to get a Unisys license to use LZW in free software that complies with the Open Source Definition or in low-volume proprietary software. The League for Programming Freedom is working to fix the US patent system to harmonize it with those of other, more sensible, countries. This may not be a relevant issue to your life. But all human affairs has something to do with you one way or another. You are a human being, after all.
Awareness is a form of knowledge, and the beginning of understanding.
If one day you live in a freedomless society, it would be too late. I've added some few minor links on some pages. Wilson's Inversive Geometry. Some analysis on n-ellipses. Permanent link added to the Ellipse page.