We're not talking about sell your copy and also keep a copy, While this can already be done say when you buy a cd, copy it and sell it used it's not ethical and we're not suggesting it. What we're saying it if you buy something it becomes yours and you can sell your property, the first sale doctrine. You buy a cd you can then sell it to someone else. So if you buy a license to an ebook and then decide you no longer want it You could sell or give it away.
In theory every copy floating around you would have been paid for aside from someone's normal backups which you'd expect them to delete if they resold the book when they were done with it, there's no real way to force them to do it, just... well one has to accept that there are always going to be people who game a system and you might find tilting at windmills more personally fulfilling than trying to stop it from ever happening.
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