You don't buy that "social agreement" bullshit? So, what then, you live in a cabin in the woods all by your lonesome? If not, then you really DO buy it, cause it drives our lives. Kill someone? Go to jail. Grow up a child in America? Go to school. Destroy someone's property? Get sued and be forced to compensate. These are all social contracts enforced by people upon people.
You chose winking to illustrate how absurd the concept of ownership can be, as an analogy for copy right infringement. I agree, the concept of owning winking seems fairly ludicrous to me. But then, the concept of owning land probably seemed ludicrous at one time. The concept of owning airwaves probably seemed ludicrous at one time. The thought that I can be held liable for mere words might seem ludicrous, until you examine the reasons we've made it so. But we function as a society, and we set up social constructs to assure the prosperity and organization of that society. You can claim all you want that copy right infringement is a false institution. Technically, you'd be right. But that claim is meaningless given that so many other organization you partake of could be satisfied by the same reasoning. I doubt if someone murdered your wife you'd be comfortable with the claim that "crime and punishment is a false, man-made institution."
As for the specific point you made concerning the actual possession of an item, how does that work with land? Why is it that we allow a businessman to own a coal mine if he's not actually in the mine digging out coal? And what about my specific example concerning your summer home. Would you be fine letting others into your house without your consent during the winter? If you're not using it, then you've not lost possession, right?
But in truth, these examples are unnecessary. We've decided, as a society, that ideas can be owned. It's not a recent idea, either. It's easy to demonstrate historically. As a societal construct, it holds as much legitimacy as any other institution enforced only through human action. Perhaps owning a wink is a ludicrous idea. I'll concede to that point. But should owning a wink ever become necessary for the growth or well-being of society, then you can bet I'll be on board with the human construct built to enforce it. Hopefully, it'll never come to that. *wink