I care very much, and I'll explain why. Whether or not a particular invention is under copyright or patent, vs in the public domain, has huge implications on wh

I care very much, and I'll explain why. Whether or not a particular invention is under copyright or patent, vs in the public domain, has huge implications on whether others are free to use and play with that invention in creations of their own. This is, after all, "Hacker" News. I would expect a lot of us would be interested in how freely we could hack on something without our creations subsequently being legally encumbered.