I was just kidding around.
The issue is whether our contract has anything to do with other people. The original thing that you responded to was supposed to show that only contracts like you are explaining work. But what follows from that is that it is not possible to use contracts to make ‘IP’ anything like it is right now. How would your contract have anything to do with a third party who happens to find a lost copy of your book on the street? Unless you are telling me that they are not even allowed to pick it up, read it, and get rid of it, your argument does not work. For, in picking it up, reading it, and getting rid of it, the third party does not necessarily handle it in a different way than in copying it. So it does not make sense to say that, whether you have a contract with them or not, you still partially own the book in any way that implies that third parties should be able to read it but not copy it.
By the way, as I said to hayekianxyz, none of this disproves that we should install ‘IP’. But we just need to make it clear what the nature of this situation is to not talk nonsense. The fact is that you have to either claim that you ‘own’ the arrangement or pattern, which you are clearly rejecting, or you have to say that third parties are not even allowed to touch a lost copy of your book, to be able to have your position, that is, pro-copyrights, even coherent. For it does not make any sense to say that you own the matter itself partially in a way that makes it so third parties are able to read it but not copy it. So, again, your only possiblity, without acquiescing to advocating that people should be able to ‘own’ certain arrangements, is to claim that third parties are just not allowed to even touch your book. But do you really want to make that your position?
EDIT:
I almost forget to mention that the other solution, which does not concern the third party, is to put into the contract lines saying that the person who buys the book is liable to pay damages if he loses it and, by that, lets third parties find and copy it. But, as other people have said, I am pretty sure that most people will not want to deal with that unless the damages are really low, which would of course make it pretty worthless to the person selling the book.