When you walk into Hair Cuttery and sit in a chair, did you sign a contract that you will pay for a haircut? No. Can you walk out without paying after you get the haircut? No. Then why do you have to pay? Because it's UNDERSTOOD. The courts can rule on what kind of implicit contracts are understood in everyday life.
The same thing with buying something that say "copyright." When you buy it, it's understood you have agreed not to copy it.
"It may be a hundred years before a computer beats humans at Go - maybe even longer. If a reasonably intelligent person learned to play Go, in a few months he could beat all existing computer programs." - Piet Hut
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